Network Working Group G. Roeck, Editor

Network Working Group G. Roeck, Editor
Request for Comments: 2128 cisco Systems
Category: Standards Track March 1997

Dial Control Management Information Base using SMIv2

Status of this Memo

This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.

Abstract

This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes managed objects used for managing demand
access circuits, including ISDN.

This document specifies a MIB module in a manner that is compliant to
the SNMPv2 SMI. The set of objects is consistent with the SNMP
framework and existing SNMP standards.

This document is a product of the ISDN MIB working group within the
Internet Engineering Task Force. Comments are solicited and should
be addressed to the working group's mailing list at isdn-
[email protected] and/or the author.

Table of Contents

1 The SNMPv2 Network Management Framework ...................... 2
1.1 Object Definitions ......................................... 2
2 Overview ..................................................... 2
2.1 Structure of MIB ........................................... 2
2.2 Relationship to the Interfaces MIB ......................... 3
2.2.1 Layering Model and Virtual Circuits ...................... 3
2.2.2 ifTestTable .............................................. 4
2.2.3 ifRcvAddressTable ........................................ 4
2.2.3.1 ifEntry for a single peer .............................. 5
2.3 Multilink and backup line support .......................... 5
2.4 Support for generic peers .................................. 5
3 Definitions .................................................. 6
3.1 Dial Control MIB ........................................... 6
4 Acknowledgments .............................................. 32
5 References ................................................... 33

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6 Security Considerations ...................................... 33
7 Author's Address ............................................. 34

1. The SNMPv2 Network Management Framework

The SNMPv2 Network Management Framework presently consists of three
major components. They are:

o the SMI, described in RFC 1902 [1] - the mechanisms used for
describing and naming objects for the purpose of management.

o the MIB-II, STD 17, RFC 1213 [2] - the core set of managed
objects for the Internet suite of protocols.

o the protocol, STD 15, RFC 1157 [3] and/or RFC 1905 [4], -
the protocol for accessing managed objects.

The Framework permits new objects to be defined for the purpose of
experimentation and evaluation.

1.1. Object Definitions

Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. Objects in the MIB are
defined using the subset of Abstract Syntax Notation One (ASN.1)
defined in the SMI. In particular, each object type is named by an
OBJECT IDENTIFIER, an administratively assigned name. The object
type together with an object instance serves to uniquely identify a
specific instantiation of the object. For human convenience, we
often use a textual string, termed the descriptor, to refer to the
object type.

2. Overview

2.1. Structure of MIB

Managing demand access circuits requires the following groups of
information:

o General configuration information.

o Information to describe peer configuration and peer statistics.
In this respect, peer configuration means information on how to
connect to peers on outgoing calls, how to identify peers on
incoming calls, and other call related configuration
information.

o Information to store active call information.

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o Information to retain call history.

The MIB, therefore, is structured into four groups.

o The dialCtlConfiguration group is used to specify general
configuration information.

o The dialCtlPeer group is used to describe peer configuration
and peer statistics.

o The callActive group is used to store active call information.

o The callHistory group is used to store call history information.
These calls could be circuit switched or they could be virtual
circuits. History of each and every call is stored, of successful
calls as well as unsuccessful and rejected calls. An entry will
be created when a call is cleared.

2.2. Relationship to the Interfaces MIB

This section clarifies the relationship of this MIB to the Interfaces
MIB [8]. Several areas of correlation are addressed in the following
subsections. The implementor is referred to the Interfaces MIB
document in order to understand the general intent of these areas.

2.2.1. Layering Model and Virtual Circuits

On an occasional access channel, there are a number of peer systems
that are permitted to call or be called, all of which need to be
treated as active from a routing viewpoint, but most of which have no
call in progress at any given time.

On dialup interfaces, this is further complicated by the fact that
calls to a given peer float from channel to channel. One cannot
definitively say "I call this peer on that interface." It is
necessary, therefore, to provide a mapping algorithm between the
low-level interfaces, and the various logical interfaces supporting
the peers. This is solved by creating a logical interface (ifEntry)
for each peer and a logical interface (ifEntry) for each low-level
interface. These are then correlated using the ifStackTable.

The low-level interfaces are either physical interfaces, e.g. modem
interfaces, or logical interfaces, e.g. ISDN B channels, which then
in turn are layered on top of physical ISDN interfaces.

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The model, therefore, looks something like this, taking ISDN as an
example:

+-------------------------------------------------------+
| Network Layer Protocol |
+------+ +-------+ +-------+ +-------+ +-------+ +------+
| | | | | | | | | | <== appears active
+-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+
| PPP | | PPP | | F/R | | PPP | | F/R |
| for | | for | | for | | for | | for | ifEntry with
|Peer1| |Peer2| |switch |Peer3| |switch shadow PeerEntry
| | | | | A | | | | B |
+-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+
| | | | <== some actually are
+--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+
| B | | B | | B | | B | | B |
|channel| |channel| |channel| |channel| |channel|
+--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+
| | | | | | | | | |
+------+ +-------+ +-------+ +-------+ +-------+ +------+
| Basic/Primary Rate Interface |
+-------------------------------------------------------+

Mapping of IP interfaces to Called Peers to B Channels

IfEntries are maintained for each peer.

In this model, each peer is required to have an associated
encapsulation layer interface. This interface can be of any kind,
e.g. PPP or LAPB.

In order to specify the network address for a given peer, one would
then usually add a routing/forwarding table entry, pointing to the
encapsulation layer interface through which this peer can be reached.

2.2.2. ifTestTable

The ifTestTable usage is defined in the MIBs defining the
encapsulation below the network layer. For example, if PPP
encapsulation is being used, the ifTestTable is defined by PPP.

2.2.3. ifRcvAddressTable

The ifRcvAddressTable usage is defined in the MIBs defining the
encapsulation below the network layer. For example, if PPP
encapsulation is being used, the ifRcvAddressTable is defined by PPP.

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2.2.3.1. ifEntry for a single peer

IfEntries are defined in the MIBs defining the encapsulation below
the network layer. For example, if PPP encapsulation is being used,
the ifEntry is defined by PPP.

ifEntries will never be created by the Dial Control MIB. The Dial
Control MIB always depends on some other ifIndex of some set of
ifTypes. That is, to create an entry in the Dial Control MIB, the
base ifEntry must already have been created through some other
mechanism.

The Dial Control entry does have its own RowStatus, permitting the
Dial Control supplementary information to come and go, but not
otherwise disturbing the ifIndex to which it is attached. If in a
given implementation the two are tightly bound, deleting the ifEntry
may have the side effect of deleting the Dial Control entry.

2.3. Multilink and backup line support

In order to support multilink and backup procedures, there may be
several entries for a single peer in the dialCtlPeerCfgTable.

A single peer is identified using the dialCtlPeerCfgId object of the
dialCtlPeerCfgTable. There may be several entries in
dialCtlPeerCfgTable with the same value of dialCtlPeerCfgId, but
different ifIndex values. Each of those entries will then describe a
possible connection to the same peer. Such entries can then be used
to handle multilink as well as backup procedures, e.g. by bundling
the attached ifEntries using PPP multilink.

2.4. Support for generic peers

Generic peers can for example be supported by permitting wild-card
characters (e.g., '?' or '*') in dialCtlPeerCfgAnswerAddress. A
number to be accepted could then be defined as partly (e.g., '*1234')
or entirely generic (e.g., '*').

A detailed specification of such a functionality is outside the scope
of this document.

However, the implementor should be aware that supporting generic
peers may cause a security hole. The user would not know where a
call is from, which could potentially allow unauthorized access.

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3. Definitions

3.1. Dial Control MIB

DIAL-CONTROL-MIB DEFINITIONS ::= BEGIN

IMPORTS
MODULE-IDENTITY,
NOTIFICATION-TYPE,
OBJECT-TYPE,
Unsigned32
FROM SNMPv2-SMI
TEXTUAL-CONVENTION,
DisplayString,
TimeStamp,
RowStatus
FROM SNMPv2-TC
MODULE-COMPLIANCE,
OBJECT-GROUP,
NOTIFICATION-GROUP
FROM SNMPv2-CONF
IANAifType
FROM IANAifType-MIB
ifOperStatus,
ifIndex,
InterfaceIndex,
InterfaceIndexOrZero
FROM IF-MIB
transmission
FROM RFC1213-MIB;

dialControlMib MODULE-IDENTITY
LAST-UPDATED "9609231544Z" -- Sep 23, 1996
ORGANIZATION "IETF ISDN Working Group"
CONTACT-INFO
" Guenter Roeck
Postal: cisco Systems
170 West Tasman Drive
San Jose, CA 95134
U.S.A.
Phone: +1 408 527 3143
E-mail: [email protected]"
DESCRIPTION
"The MIB module to describe peer information for
demand access and possibly other kinds of interfaces."
::= { transmission 21 }

AbsoluteCounter32 ::= TEXTUAL-CONVENTION

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STATUS current
DESCRIPTION
"Represents a Counter32-like value that starts at zero,
does not decrease, and does not wrap. This may be used
only in situations where wrapping is not possible or
extremely unlikely. Should such a counter overflow,
it locks at the maxium value of 4,294,967,295.

The primary use of this type of counter is situations
where a counter value is to be recorded as history
and is thus no longer subject to reading for changing
values."
SYNTAX Unsigned32

-- Dial Control Mib objects definitions

dialControlMibObjects OBJECT IDENTIFIER ::= { dialControlMib 1 }

-- General configuration group

dialCtlConfiguration OBJECT IDENTIFIER ::= { dialControlMibObjects 1 }

-- general configuration data/parameters

dialCtlAcceptMode OBJECT-TYPE
SYNTAX INTEGER {
acceptNone(1),
acceptAll(2),
acceptKnown(3)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The security level for acceptance of incoming calls.
acceptNone(1) - incoming calls will not be accepted
acceptAll(2) - incoming calls will be accepted,
even if there is no matching entry
in the dialCtlPeerCfgTable
acceptKnown(3) - incoming calls will be accepted only
if there is a matching entry in the
dialCtlPeerCfgTable
"
::= { dialCtlConfiguration 1 }

dialCtlTrapEnable OBJECT-TYPE
SYNTAX INTEGER {
enabled(1),
disabled(2)

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}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object indicates whether dialCtlPeerCallInformation
and dialCtlPeerCallSetup traps should be generated for
all peers. If the value of this object is enabled(1),
traps will be generated for all peers. If the value
of this object is disabled(2), traps will be generated
only for peers having dialCtlPeerCfgTrapEnable set
to enabled(1)."
DEFVAL { disabled }
::= { dialCtlConfiguration 2 }

-- Peer group

dialCtlPeer OBJECT IDENTIFIER ::= { dialControlMibObjects 2 }

-- peer configuration table

dialCtlPeerCfgTable OBJECT-TYPE
SYNTAX SEQUENCE OF DialCtlPeerCfgEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The list of peers from which the managed device
will accept calls or to which it will place them."
::= { dialCtlPeer 1 }

dialCtlPeerCfgEntry OBJECT-TYPE
SYNTAX DialCtlPeerCfgEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Configuration data for a single Peer. This entry is
effectively permanent, and contains information
to identify the peer, how to connect to the peer,
how to identify the peer and its permissions.
The value of dialCtlPeerCfgOriginateAddress must be
specified before a new row in this table can become
active(1). Any writeable parameters in an existing entry
can be modified while the entry is active. The modification
will take effect when the peer in question will be
called the next time.
An entry in this table can only be created if the
associated ifEntry already exists."
INDEX { dialCtlPeerCfgId, ifIndex }

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::= { dialCtlPeerCfgTable 1 }

DialCtlPeerCfgEntry ::= SEQUENCE {
dialCtlPeerCfgId INTEGER,
dialCtlPeerCfgIfType IANAifType,
dialCtlPeerCfgLowerIf InterfaceIndexOrZero,
dialCtlPeerCfgOriginateAddress DisplayString,
dialCtlPeerCfgAnswerAddress DisplayString,
dialCtlPeerCfgSubAddress DisplayString,
dialCtlPeerCfgClosedUserGroup DisplayString,
dialCtlPeerCfgSpeed INTEGER,
dialCtlPeerCfgInfoType INTEGER,
dialCtlPeerCfgPermission INTEGER,
dialCtlPeerCfgInactivityTimer INTEGER,
dialCtlPeerCfgMinDuration INTEGER,
dialCtlPeerCfgMaxDuration INTEGER,
dialCtlPeerCfgCarrierDelay INTEGER,
dialCtlPeerCfgCallRetries INTEGER,
dialCtlPeerCfgRetryDelay INTEGER,
dialCtlPeerCfgFailureDelay INTEGER,
dialCtlPeerCfgTrapEnable INTEGER,
dialCtlPeerCfgStatus RowStatus
}

dialCtlPeerCfgId OBJECT-TYPE
SYNTAX INTEGER (1..2147483647)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object identifies a single peer. There may
be several entries in this table for one peer,
defining different ways of reaching this peer.
Thus, there may be several entries in this table
with the same value of dialCtlPeerCfgId.
Multiple entries for one peer may be used to support
multilink as well as backup lines.
A single peer will be identified by a unique value
of this object. Several entries for one peer MUST
have the same value of dialCtlPeerCfgId, but different
ifEntries and thus different values of ifIndex."
::= { dialCtlPeerCfgEntry 1 }

dialCtlPeerCfgIfType OBJECT-TYPE
SYNTAX IANAifType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The interface type to be used for calling this peer.

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In case of ISDN, the value of isdn(63) is to be used."
DEFVAL { other }
::= { dialCtlPeerCfgEntry 2 }

dialCtlPeerCfgLowerIf OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"ifIndex value of an interface the peer will have to be
called on. For example, on an ISDN interface, this can be
the ifIndex value of a D channel or the ifIndex value of a
B channel, whatever is appropriate for a given peer.
As an example, for Basic Rate leased lines it will be
necessary to specify a B channel ifIndex, while for
semi-permanent connections the D channel ifIndex has
to be specified.
If the interface can be dynamically assigned, this object
has a value of zero."
DEFVAL { 0 }
::= { dialCtlPeerCfgEntry 3 }

dialCtlPeerCfgOriginateAddress OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Call Address at which the peer will be called.
Think of this as the set of characters following 'ATDT '
or the 'phone number' included in a D channel call request.

The structure of this information will be switch type
specific. If there is no address information required
for reaching the peer, i.e., for leased lines,
this object will be a zero length string."
::= { dialCtlPeerCfgEntry 4 }

dialCtlPeerCfgAnswerAddress OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Calling Party Number information element, as for example
passed in an ISDN SETUP message by a PBX or switch,
for incoming calls.
This address can be used to identify the peer.
If this address is either unknown or identical
to dialCtlPeerCfgOriginateAddress, this object will be

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a zero length string."
DEFVAL { "" }
::= { dialCtlPeerCfgEntry 5 }

dialCtlPeerCfgSubAddress OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Subaddress at which the peer will be called.
If the subaddress is undefined for the given media or
unused, this is a zero length string."
DEFVAL { "" }
::= { dialCtlPeerCfgEntry 6 }

dialCtlPeerCfgClosedUserGroup OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Closed User Group at which the peer will be called.
If the Closed User Group is undefined for the given media
or unused, this is a zero length string."
REFERENCE
"Q.931, chapter 4.6.1."
DEFVAL { "" }
::= { dialCtlPeerCfgEntry 7 }

dialCtlPeerCfgSpeed OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The desired information transfer speed in bits/second
when calling this peer.
The detailed media specific information, e.g. information
type and information transfer rate for ISDN circuits,
has to be extracted from this object.
If the transfer speed to be used is unknown or the default
speed for this type of interfaces, the value of this object
may be zero."
DEFVAL { 0 }
::= { dialCtlPeerCfgEntry 8 }

dialCtlPeerCfgInfoType OBJECT-TYPE
SYNTAX INTEGER {
other(1),
speech(2),

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unrestrictedDigital(3), -- 64k/s data
unrestrictedDigital56(4), -- with 56k rate adaption
restrictedDigital(5),
audio31(6), -- 3.1 kHz audio
audio7(7), -- 7 kHz audio
video(8),
packetSwitched(9),
fax(10)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The Information Transfer Capability to be used when
calling this peer.

speech(2) refers to a non-data connection, whereas
audio31(6) and audio7(7) refer to data mode
connections."
DEFVAL { other }
::= { dialCtlPeerCfgEntry 9 }

dialCtlPeerCfgPermission OBJECT-TYPE
SYNTAX INTEGER {
originate(1),
answer(2),
both(3), -- both originate & answer
callback(4),
none(5)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Applicable permissions. callback(4) either rejects the
call and then calls back, or uses the 'Reverse charging'
information element if it is available.
Note that callback(4) is supposed to control charging, not
security, and applies to callback prior to accepting a
call. Callback for security reasons can be handled using
PPP callback."
DEFVAL { both }
::= { dialCtlPeerCfgEntry 10 }

dialCtlPeerCfgInactivityTimer OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION

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"The connection will be automatically disconnected
if no longer carrying useful data for a time
period, in seconds, specified in this object.
Useful data in this context refers to forwarding
packets, including routing information; it
excludes the encapsulator maintenance frames.
A value of zero means the connection will not be
automatically taken down due to inactivity,
which implies that it is a dedicated circuit."
DEFVAL { 0 }
::= { dialCtlPeerCfgEntry 11 }

dialCtlPeerCfgMinDuration OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Minimum duration of a call in seconds, starting from the
time the call is connected until the call is disconnected.
This is to accomplish the fact that in most countries
charging applies to units of time, which should be matched
as closely as possible."
DEFVAL { 0 }
::= { dialCtlPeerCfgEntry 12 }

dialCtlPeerCfgMaxDuration OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Maximum call duration in seconds. Zero means 'unlimited'."
DEFVAL { 0 }
::= { dialCtlPeerCfgEntry 13 }

dialCtlPeerCfgCarrierDelay OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The call timeout time in seconds. The default value
of zero means that the call timeout as specified for
the media in question will apply."
DEFVAL { 0 }
::= { dialCtlPeerCfgEntry 14 }

dialCtlPeerCfgCallRetries OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)

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MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The number of calls to a non-responding address
that may be made. A retry count of zero means
there is no bound. The intent is to bound
the number of successive calls to an address
which is inaccessible, or which refuses those calls.

Some countries regulate the number of call retries
to a given peer that can be made."
DEFVAL { 0 }
::= { dialCtlPeerCfgEntry 15 }

dialCtlPeerCfgRetryDelay OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The time in seconds between call retries if a peer
cannot be reached.
A value of zero means that call retries may be done
without any delay."
DEFVAL { 0 }
::= { dialCtlPeerCfgEntry 16 }

dialCtlPeerCfgFailureDelay OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The time in seconds after which call attempts are
to be placed again after a peer has been noticed
to be unreachable, i.e. after dialCtlPeerCfgCallRetries
unsuccessful call attempts.
A value of zero means that a peer will not be called
again after dialCtlPeerCfgCallRetries unsuccessful call
attempts."
DEFVAL { 0 }
::= { dialCtlPeerCfgEntry 17 }

dialCtlPeerCfgTrapEnable OBJECT-TYPE
SYNTAX INTEGER {
enabled(1),
disabled(2)
}

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MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object indicates whether dialCtlPeerCallInformation
and dialCtlPeerCallSetup traps should be generated for
this peer."
DEFVAL { disabled }
::= { dialCtlPeerCfgEntry 18 }

dialCtlPeerCfgStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Status of one row in this table."
::= { dialCtlPeerCfgEntry 19 }

-- Peer statistics table

dialCtlPeerStatsTable OBJECT-TYPE
SYNTAX SEQUENCE OF DialCtlPeerStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Statistics information for each peer entry.
There will be one entry in this table for each entry
in the dialCtlPeerCfgTable."
::= { dialCtlPeer 2 }

dialCtlPeerStatsEntry OBJECT-TYPE
SYNTAX DialCtlPeerStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Statistics information for a single Peer. This entry
is effectively permanent, and contains information
describing the last call attempt as well as supplying
statistical information."
AUGMENTS { dialCtlPeerCfgEntry }
::= { dialCtlPeerStatsTable 1 }

DialCtlPeerStatsEntry ::=
SEQUENCE {
dialCtlPeerStatsConnectTime AbsoluteCounter32,
dialCtlPeerStatsChargedUnits AbsoluteCounter32,
dialCtlPeerStatsSuccessCalls AbsoluteCounter32,
dialCtlPeerStatsFailCalls AbsoluteCounter32,
dialCtlPeerStatsAcceptCalls AbsoluteCounter32,

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dialCtlPeerStatsRefuseCalls AbsoluteCounter32,
dialCtlPeerStatsLastDisconnectCause OCTET STRING,
dialCtlPeerStatsLastDisconnectText DisplayString,
dialCtlPeerStatsLastSetupTime TimeStamp
}

dialCtlPeerStatsConnectTime OBJECT-TYPE
SYNTAX AbsoluteCounter32
UNITS "seconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Accumulated connect time to the peer since system startup.
This is the total connect time, i.e. the connect time
for outgoing calls plus the time for incoming calls."
::= { dialCtlPeerStatsEntry 1 }

dialCtlPeerStatsChargedUnits OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of charging units applying to this
peer since system startup.
Only the charging units applying to the local interface,
i.e. for originated calls or for calls with 'Reverse
charging' being active, will be counted here."
::= { dialCtlPeerStatsEntry 2 }

dialCtlPeerStatsSuccessCalls OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of completed calls to this peer."
::= { dialCtlPeerStatsEntry 3 }

dialCtlPeerStatsFailCalls OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of failed call attempts to this peer since system
startup."
::= { dialCtlPeerStatsEntry 4 }

dialCtlPeerStatsAcceptCalls OBJECT-TYPE
SYNTAX AbsoluteCounter32

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MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls from this peer accepted since system
startup."
::= { dialCtlPeerStatsEntry 5 }

dialCtlPeerStatsRefuseCalls OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls from this peer refused since system
startup."
::= { dialCtlPeerStatsEntry 6 }

dialCtlPeerStatsLastDisconnectCause OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (0..4))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The encoded network cause value associated with the last
call.
This object will be updated whenever a call is started
or cleared.
The value of this object will depend on the interface type
as well as on the protocol and protocol version being
used on this interface. Some references for possible cause
values are given below."
REFERENCE
"- Bellcore SR-NWT-001953, Generic Guidelines for
ISDN Terminal Equipment On Basic Access Interfaces,
chapter 5.2.5.8.
- Bellcore SR-NWT-002343, ISDN Primary Rate Interface
Generic Guidelines for Customer Premises Equipment,
chapter 8.2.5.8.
- ITU-T Q.931, Appendix I.
- ITU-T X.25, CAUSE and DIAGNOSTIC field values.
- German Telekom FTZ 1TR6, chapter 3.2.3.4.4.4."
::= { dialCtlPeerStatsEntry 7 }

dialCtlPeerStatsLastDisconnectText OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"ASCII text describing the reason for the last call
termination.

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RFC 2128 Dial Control MIB March 1997

This object exists because it would be impossible for
a management station to store all possible cause values
for all types of interfaces. It should be used only if
a management station is unable to decode the value of
dialCtlPeerStatsLastDisconnectCause.

This object will be updated whenever a call is started
or cleared."
::= { dialCtlPeerStatsEntry 8 }

dialCtlPeerStatsLastSetupTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime when the last call to this peer
was started.
For ISDN media, this will be the time when the setup
message was received from or sent to the network.
This object will be updated whenever a call is started
or cleared."
::= { dialCtlPeerStatsEntry 9 }

--
-- the active call group
--

callActive OBJECT IDENTIFIER ::= { dialControlMibObjects 3 }

-- callActiveTable
-- Table to store active call information.
-- These calls could be circuit switched or they could
-- be virtual circuits.
-- An entry will be created when a call is started and deleted
-- when a call is cleared.

callActiveTable OBJECT-TYPE
SYNTAX SEQUENCE OF CallActiveEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table containing information about active
calls to a specific destination."
::= { callActive 1 }

callActiveEntry OBJECT-TYPE
SYNTAX CallActiveEntry
MAX-ACCESS not-accessible

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STATUS current
DESCRIPTION
"The information regarding a single active Connection.
An entry in this table will be created when a call is
started. An entry in this table will be deleted when
an active call clears."
INDEX { callActiveSetupTime, callActiveIndex }
::= { callActiveTable 1 }

CallActiveEntry ::=
SEQUENCE {
callActiveSetupTime TimeStamp,
callActiveIndex INTEGER,
callActivePeerAddress DisplayString,
callActivePeerSubAddress DisplayString,
callActivePeerId INTEGER,
callActivePeerIfIndex INTEGER,
callActiveLogicalIfIndex InterfaceIndexOrZero,
callActiveConnectTime TimeStamp,
callActiveCallState INTEGER,
callActiveCallOrigin INTEGER,
callActiveChargedUnits AbsoluteCounter32,
callActiveInfoType INTEGER,
callActiveTransmitPackets AbsoluteCounter32,
callActiveTransmitBytes AbsoluteCounter32,
callActiveReceivePackets AbsoluteCounter32,
callActiveReceiveBytes AbsoluteCounter32
}

callActiveSetupTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The value of sysUpTime when the call associated to this
entry was started. This will be useful for an NMS to
retrieve all calls after a specific time. Also, this object
can be useful in finding large delays between the time the
call was started and the time the call was connected.
For ISDN media, this will be the time when the setup
message was received from or sent to the network."
::= { callActiveEntry 1 }

callActiveIndex OBJECT-TYPE
SYNTAX INTEGER (1..'7fffffff'h)
MAX-ACCESS not-accessible
STATUS current

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DESCRIPTION
"Small index variable to distinguish calls that start in
the same hundredth of a second."
::= { callActiveEntry 2 }

callActivePeerAddress OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number this call is connected to. If the number is
not available, then it will have a length of zero."
::= { callActiveEntry 3 }

callActivePeerSubAddress OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The subaddress this call is connected to. If the subaddress
is undefined or not available, this will be a zero length
string."
::= { callActiveEntry 4 }

callActivePeerId OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is the Id value of the peer table entry
to which this call was made. If a peer table entry
for this call does not exist or is unknown, the value
of this object will be zero."
::= { callActiveEntry 5 }

callActivePeerIfIndex OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is the ifIndex value of the peer table entry
to which this call was made. If a peer table entry
for this call does not exist or is unknown, the value
of this object will be zero."
::= { callActiveEntry 6 }

callActiveLogicalIfIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero

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MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is the ifIndex value of the logical interface through
which this call was made. For ISDN media, this would be
the ifIndex of the B channel which was used for this call.
If the ifIndex value is unknown, the value of this object
will be zero."
::= { callActiveEntry 7 }

callActiveConnectTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime when the call was connected.
If the call is not connected, this object will have a
value of zero."
::= { callActiveEntry 8 }

callActiveCallState OBJECT-TYPE
SYNTAX INTEGER {
unknown(1),
connecting(2),
connected(3),
active(4)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The current call state.
unknown(1) - The call state is unknown.
connecting(2) - A connection attempt (outgoing call)
is being made.
connected(3) - An incoming call is in the process
of validation.
active(4) - The call is active.
"
::= { callActiveEntry 9 }

callActiveCallOrigin OBJECT-TYPE
SYNTAX INTEGER {
originate(1),
answer(2),
callback(3)
}
MAX-ACCESS read-only
STATUS current

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DESCRIPTION
"The call origin."
::= { callActiveEntry 10 }

callActiveChargedUnits OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of charged units for this connection.
For incoming calls or if charging information is
not supplied by the switch, the value of this object
will be zero."
::= { callActiveEntry 11 }

callActiveInfoType OBJECT-TYPE
SYNTAX INTEGER {
other(1), -- e.g. for non-isdn media
speech(2),
unrestrictedDigital(3), -- 64k/s data
unrestrictedDigital56(4), -- with 56k rate adaption
restrictedDigital(5),
audio31(6), -- 3.1 kHz audio
audio7(7), -- 7 kHz audio
video(8),
packetSwitched(9),
fax(10)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The information type for this call."
::= { callActiveEntry 12 }

callActiveTransmitPackets OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of packets which were transmitted for this
call."
::= { callActiveEntry 13 }

callActiveTransmitBytes OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION

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"The number of bytes which were transmitted for this
call."
::= { callActiveEntry 14 }

callActiveReceivePackets OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of packets which were received for this
call."
::= { callActiveEntry 15 }

callActiveReceiveBytes OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of bytes which were received for this call."
::= { callActiveEntry 16 }

--
-- the call history group
--

callHistory OBJECT IDENTIFIER ::= { dialControlMibObjects 4 }

callHistoryTableMaxLength OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The upper limit on the number of entries that the
callHistoryTable may contain. A value of 0
will prevent any history from being retained. When
this table is full, the oldest entry will be deleted
and the new one will be created."
::= { callHistory 1 }

callHistoryRetainTimer OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
UNITS "minutes"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The minimum amount of time that an callHistoryEntry
will be maintained before being deleted. A value of
0 will prevent any history from being retained in the

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callHistoryTable, but will neither prevent callCompletion
traps being generated nor affect other tables."
::= { callHistory 2 }

-- callHistoryTable
-- Table to store the past call information. The Destination number
-- and the call connect and disconnect time, the disconnection cause
-- are stored. These calls could be circuit switched or they could
-- be virtual circuits. History of each and every call is stored,
-- of successful calls as well as of unsuccessful and rejected calls.
-- An entry will be created when a call is cleared.

callHistoryTable OBJECT-TYPE
SYNTAX SEQUENCE OF CallHistoryEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table containing information about specific
calls to a specific destination."
::= { callHistory 3 }

callHistoryEntry OBJECT-TYPE
SYNTAX CallHistoryEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The information regarding a single Connection."
INDEX { callActiveSetupTime, callActiveIndex }
::= { callHistoryTable 1 }

CallHistoryEntry ::=
SEQUENCE {
callHistoryPeerAddress DisplayString,
callHistoryPeerSubAddress DisplayString,
callHistoryPeerId INTEGER,
callHistoryPeerIfIndex INTEGER,
callHistoryLogicalIfIndex InterfaceIndex,
callHistoryDisconnectCause OCTET STRING,
callHistoryDisconnectText DisplayString,
callHistoryConnectTime TimeStamp,
callHistoryDisconnectTime TimeStamp,
callHistoryCallOrigin INTEGER,
callHistoryChargedUnits AbsoluteCounter32,
callHistoryInfoType INTEGER,
callHistoryTransmitPackets AbsoluteCounter32,
callHistoryTransmitBytes AbsoluteCounter32,
callHistoryReceivePackets AbsoluteCounter32,

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callHistoryReceiveBytes AbsoluteCounter32
}

callHistoryPeerAddress OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number this call was connected to. If the number is
not available, then it will have a length of zero."
::= { callHistoryEntry 1 }

callHistoryPeerSubAddress OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The subaddress this call was connected to. If the subaddress
is undefined or not available, this will be a zero length
string."
::= { callHistoryEntry 2 }

callHistoryPeerId OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is the Id value of the peer table entry
to which this call was made. If a peer table entry
for this call does not exist, the value of this object
will be zero."
::= { callHistoryEntry 3 }

callHistoryPeerIfIndex OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is the ifIndex value of the peer table entry
to which this call was made. If a peer table entry
for this call does not exist, the value of this object
will be zero."
::= { callHistoryEntry 4 }

callHistoryLogicalIfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current

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DESCRIPTION
"This is the ifIndex value of the logical interface through
which this call was made. For ISDN media, this would be
the ifIndex of the B channel which was used for this call."
::= { callHistoryEntry 5 }

callHistoryDisconnectCause OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (0..4))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The encoded network cause value associated with this call.

The value of this object will depend on the interface type
as well as on the protocol and protocol version being
used on this interface. Some references for possible cause
values are given below."
REFERENCE
"- Bellcore SR-NWT-001953, Generic Guidelines for
ISDN Terminal Equipment On Basic Access Interfaces,
chapter 5.2.5.8.
- Bellcore SR-NWT-002343, ISDN Primary Rate Interface
Generic Guidelines for Customer Premises Equipment,
chapter 8.2.5.8.
- ITU-T Q.931, Appendix I.
- ITU-T X.25, CAUSE and DIAGNOSTIC field values.
- German Telekom FTZ 1TR6, chapter 3.2.3.4.4.4."
::= { callHistoryEntry 6 }

callHistoryDisconnectText OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"ASCII text describing the reason for call termination.

This object exists because it would be impossible for
a management station to store all possible cause values
for all types of interfaces. It should be used only if
a management station is unable to decode the value of
dialCtlPeerStatsLastDisconnectCause."
::= { callHistoryEntry 7 }

callHistoryConnectTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION

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RFC 2128 Dial Control MIB March 1997

"The value of sysUpTime when the call was connected."
::= { callHistoryEntry 8 }

callHistoryDisconnectTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime when the call was disconnected."
::= { callHistoryEntry 9 }

callHistoryCallOrigin OBJECT-TYPE
SYNTAX INTEGER {
originate(1),
answer(2),
callback(3)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The call origin."
::= { callHistoryEntry 10 }

callHistoryChargedUnits OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of charged units for this connection.
For incoming calls or if charging information is
not supplied by the switch, the value of this object
will be zero."
::= { callHistoryEntry 11 }

callHistoryInfoType OBJECT-TYPE
SYNTAX INTEGER {
other(1), -- e.g. for non-isdn media
speech(2),
unrestrictedDigital(3), -- 64k/s data
unrestrictedDigital56(4), -- with 56k rate adaption
restrictedDigital(5),
audio31(6), -- 3.1 kHz audio
audio7(7), -- 7 kHz audio
video(8),
packetSwitched(9),
fax(10)
}
MAX-ACCESS read-only

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STATUS current
DESCRIPTION
"The information type for this call."
::= { callHistoryEntry 12 }

callHistoryTransmitPackets OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of packets which were transmitted while this
call was active."
::= { callHistoryEntry 13 }

callHistoryTransmitBytes OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of bytes which were transmitted while this
call was active."
::= { callHistoryEntry 14 }

callHistoryReceivePackets OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of packets which were received while this
call was active."
::= { callHistoryEntry 15 }

callHistoryReceiveBytes OBJECT-TYPE
SYNTAX AbsoluteCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of bytes which were received while this
call was active."
::= { callHistoryEntry 16 }

-- Traps related to Connection management

dialControlMibTrapPrefix OBJECT IDENTIFIER ::= { dialControlMib 2 }
dialControlMibTraps OBJECT IDENTIFIER ::= { dialControlMibTrapPrefix 0 }

dialCtlPeerCallInformation NOTIFICATION-TYPE
OBJECTS {

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callHistoryPeerId,
callHistoryPeerIfIndex,
callHistoryLogicalIfIndex,
ifOperStatus,
callHistoryPeerAddress,
callHistoryPeerSubAddress,
callHistoryDisconnectCause,
callHistoryConnectTime,
callHistoryDisconnectTime,
callHistoryInfoType,
callHistoryCallOrigin
}
STATUS current
DESCRIPTION
"This trap/inform is sent to the manager whenever
a successful call clears, or a failed call attempt
is determined to have ultimately failed. In the
event that call retry is active, then this is after
all retry attempts have failed. However, only one such
trap is sent in between successful call attempts;
subsequent call attempts result in no trap.
ifOperStatus will return the operational status of the
virtual interface associated with the peer to whom
this call was made to."
::= { dialControlMibTraps 1 }

dialCtlPeerCallSetup NOTIFICATION-TYPE
OBJECTS {
callActivePeerId,
callActivePeerIfIndex,
callActiveLogicalIfIndex,
ifOperStatus,
callActivePeerAddress,
callActivePeerSubAddress,
callActiveInfoType,
callActiveCallOrigin
}
STATUS current
DESCRIPTION
"This trap/inform is sent to the manager whenever
a call setup message is received or sent.
ifOperStatus will return the operational status of the
virtual interface associated with the peer to whom
this call was made to."
::= { dialControlMibTraps 2 }

-- conformance information

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RFC 2128 Dial Control MIB March 1997

dialControlMibConformance OBJECT IDENTIFIER ::=
{ dialControlMib 3 }
dialControlMibCompliances OBJECT IDENTIFIER ::=
{ dialControlMibConformance 1 }
dialControlMibGroups OBJECT IDENTIFIER ::=
{ dialControlMibConformance 2 }

-- compliance statements

dialControlMibCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for entities which
implement the DIAL CONTROL MIB"
MODULE -- this module
MANDATORY-GROUPS
{ dialControlGroup, callActiveGroup, callHistoryGroup,
callNotificationsGroup }
::= { dialControlMibCompliances 1 }

-- units of conformance

dialControlGroup OBJECT-GROUP
OBJECTS {
dialCtlAcceptMode,
dialCtlTrapEnable,
dialCtlPeerCfgIfType,
dialCtlPeerCfgLowerIf,
dialCtlPeerCfgOriginateAddress,
dialCtlPeerCfgAnswerAddress,
dialCtlPeerCfgSubAddress,
dialCtlPeerCfgClosedUserGroup,
dialCtlPeerCfgSpeed,
dialCtlPeerCfgInfoType,
dialCtlPeerCfgPermission,
dialCtlPeerCfgInactivityTimer,
dialCtlPeerCfgMinDuration,
dialCtlPeerCfgMaxDuration,
dialCtlPeerCfgCarrierDelay,
dialCtlPeerCfgCallRetries,
dialCtlPeerCfgRetryDelay,
dialCtlPeerCfgFailureDelay,
dialCtlPeerCfgTrapEnable,
dialCtlPeerCfgStatus,
dialCtlPeerStatsConnectTime,
dialCtlPeerStatsChargedUnits,
dialCtlPeerStatsSuccessCalls,
dialCtlPeerStatsFailCalls,

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RFC 2128 Dial Control MIB March 1997

dialCtlPeerStatsAcceptCalls,
dialCtlPeerStatsRefuseCalls,
dialCtlPeerStatsLastDisconnectCause,
dialCtlPeerStatsLastDisconnectText,
dialCtlPeerStatsLastSetupTime
}
STATUS current
DESCRIPTION
"A collection of objects providing the DIAL CONTROL
capability."
::= { dialControlMibGroups 1 }

callActiveGroup OBJECT-GROUP
OBJECTS {
callActivePeerAddress,
callActivePeerSubAddress,
callActivePeerId,
callActivePeerIfIndex,
callActiveLogicalIfIndex,
callActiveConnectTime,
callActiveCallState,
callActiveCallOrigin,
callActiveChargedUnits,
callActiveInfoType,
callActiveTransmitPackets,
callActiveTransmitBytes,
callActiveReceivePackets,
callActiveReceiveBytes
}
STATUS current
DESCRIPTION
"A collection of objects providing the active call
capability."
::= { dialControlMibGroups 2 }

callHistoryGroup OBJECT-GROUP
OBJECTS {
callHistoryTableMaxLength,
callHistoryRetainTimer,
callHistoryPeerAddress,
callHistoryPeerSubAddress,
callHistoryPeerId,
callHistoryPeerIfIndex,
callHistoryLogicalIfIndex,
callHistoryDisconnectCause,
callHistoryDisconnectText,
callHistoryConnectTime,
callHistoryDisconnectTime,

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RFC 2128 Dial Control MIB March 1997

callHistoryCallOrigin,
callHistoryChargedUnits,
callHistoryInfoType,
callHistoryTransmitPackets,
callHistoryTransmitBytes,
callHistoryReceivePackets,
callHistoryReceiveBytes
}
STATUS current
DESCRIPTION
"A collection of objects providing the Call History
capability."
::= { dialControlMibGroups 3 }

callNotificationsGroup NOTIFICATION-GROUP
NOTIFICATIONS { dialCtlPeerCallInformation, dialCtlPeerCallSetup }
STATUS current
DESCRIPTION
"The notifications which a Dial Control MIB entity is
required to implement."
::= { dialControlMibGroups 4 }

END

4. Acknowledgments

This document was produced by the ISDN MIB Working Group. Special
thanks is due to the following persons:

Ed Alcoff
Fred Baker
Bibek A. Das
Ken Grigg
Jeffrey T. Johnson
Glenn Kime
Oliver Korfmacher
Kedar Madineni
Bill Miskovetz
David M. Piscitello
Lisa A. Phifer
Randy Roberts
Hascall H. Sharp
Hongchi Shih
Robert Snyder
Bob Stewart
Ron Stoughton
James Watt

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RFC 2128 Dial Control MIB March 1997

5. References

[1] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Structure of Management Information for Version 2
of the Simple Network Management Protocol (SNMPv2)", RFC 1902,
January 1996.

[2] McCloghrie, K., and M. Rose, Editors, "Management Information Base
for Network Management of TCP/IP-based internets: MIB-II", STD 17,
RFC 1213, Hughes LAN Systems, Performance Systems International,
March 1991.

[3] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "A Simple
Network Management Protocol (SNMP)", STD 15, RFC 1157, SNMP
Research, Performance Systems International, MIT Lab for Computer
Science, May 1990.

[4] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M. and
S. Waldbusser, "Protocol Operations for Version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC 1905, January 1996.

[5] ITU-T Recommendation "Digital subscriber Signalling System No. 1
(DSS 1) - ISDN user-network interface layer 3 specification for
basic call control", Rec. Q.931(I.451), March 1993.

[6] ITU-T Recommendation "Generic procedures for the control of ISDN
supplementary services ISDN user-network interface layer 3
specification", Rec. Q.932(I.452).

[7] ITU-T Recommendation "Digital subscriber Signalling System No. 1
(DSS 1) - Signalling specification for frame-mode basic call
control", Rec. Q.933.

[8] McCloghrie, K. and F. Kastenholz, "Evolution of the Interfaces
Group of MIB-II", RFC 1573, Hughes LAN Systems, FTP Software,
January 1994.

6. Security Considerations

Information in this MIB may be used by upper protocol layers for
security purpose.

The implementor should be aware that supporting generic peers as
described in section 3.4 may cause a security hole. The user would
not know where a call is from, which could potentially allow
unauthorized access if there is no other authentication scheme, e.g.
PPP authentication, available.

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RFC 2128 Dial Control MIB March 1997

7. Author's Address

Guenter Roeck
cisco Systems
170 West Tasman Drive
San Jose, CA 95134
U.S.A.

Phone: +1 408 527 3143
EMail: [email protected]

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