Network Working Group C. Allocchio

Network Working Group C. Allocchio
Request for Comments: 2846 GARR-Italy
Category: Standards Track June 2000

GSTN Address Element Extensions in E-mail Services

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.

Copyright Notice

Copyright (C) The Internet Society (2000). All Rights Reserved.

Abstract

There are numerous applications where there is a need for interaction
between the GSTN addressing and Internet addressing. This memo
defines a full syntax for one specific case, where there is a need to
represent GSTN addresses within Internet e-mail addresses. This full
syntax is a superset of a minimal syntax which has been defined in
[1].

1. Introduction

The possible elements composing a "Global Switched Telephone Network
(GSTN) address in e-mail" (also known as the Public Switched
Telephone Network - PSTN) can vary from a minimum number up to a
really large and complex collection. As noted the minimal format and
general address syntax have been defined in [1], along with the
mechanism needed to define additional address elements. This memo
uses this extension mechanism to complete the syntax for representing
GSTN addresses within e-mail addresses and contains the IANA
registrations for all newly defined elements.

In particular, the following additional address elements shall be
defined:

- the detailed definition of GSTN number formats, in order to cover
various alternative standard GSTN numbering schemes, (i.e. gstn-
phone, sub-addr-spec and post-dial)

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RFC 2846 GSTN Address Extensions in E-mail Services June 2000

- the message originator and/or recipient specification (pstn-
recipient)

GSTN addresses in e-mail MAY contain additional elements defined and
registered in other specifications (see for example "T33S" element in
[2]), but they MUST use definitions contained in this memo for those
elements specified here.

In particular, "service-selector" names and "qualif-type1" elements
MUST be registered with IANA, and published within the "ASSIGNED
NUMBERS" document. This provides a standard mechanism for extending
the element sets and should avoid unnecessary duplication. IANA
Registration form templates for the purpouse of registering new
elements are provided in Appendix B. In addition the IANA
consideration section of this document defines the procedures
required to proceed with new registrations.

A collection of forms for already defined "service-selector" and
"qualif-type1" elements is listed in appendix C and appendix D
respectively.

In particular, efforts have been made to maintain compatibility with
elements defined in existing e-mail gateway services and standard
specifications. For example, to the extent possible, compatibility
has been maintained with the MIXER [3] gateways specifications.

1.1 Relationship with Internet addressing other than e-mail

Even if in this memo we focus on e-mail addresses, a number of
elements defined in this specification can also be used for other
specifications dealing with embedding GSTN addresses into other
addresses: for example there is some work in progress about URLs
specification which adopts similar definitions, with slight changes
in the global syntax due to specific URL format.

1.2 Terminology and Syntax conventions

In this document the formal definitions are described using ABNF
syntax, as defined into [4]. We will also use some of the "CORE
DEFINITIONS" defined in "APPENDIX A - CORE" of that document. The
exact meaning of the capitalised words

"MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
"SHOULD NOT", "RECOMMENDED", "MAY", "OPTIONAL"

is defined in reference [5].

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RFC 2846 GSTN Address Extensions in E-mail Services June 2000

2. GSTN extended number and pstn-mbox extended format

In reference [1], section 2, the minimal definition of pstn-mbox
includes the global-phone element, and further details are defined in
[1] section 2.1.

However other non global-phone numbering schemes are also possible.
Thus, the minimal set syntax defined in [1] shall be extended to
enable support for local-phone elements. Therefore, the gstn-phone
format is defined as follows:

gstn-phone = ( global-phone / local-phone )

The complexity of the GSTN system includes also the optional use of
subaddresses and post dialling sequences. As a consequence, there is
a need to extend the definition of pstn-mbox per [1] to include
support for both the minimal set definition and an extended syntax.

The expanded definition of pstn-mbox is as follows:

pstn-mbox = service-selector "=" global-phone

pstn-mbox =/ service-selector "=" gstn-phone
[ sub-addr-spec ] [post-sep post-dial]

NOTE: see section 4 in the event multiple "sub-addr-spec" elements
per pstn-mbox need to be specified.

2.1 The local-phone syntax

The local-phone element is intended to represent the set of possible
cases where the global-phone numbering schema does not apply. Given
the different and complex conventions currently being used in the
GSTN system, the local-phone definition supports a large number of
elements.

The detailed syntax for local-phone elements follows:

local-phone = [ exit-code ] [ dial-number ]

exit-code = phone-string
; this will include elements such as the digit to
; access outside line, the long distance carrier
; access code, the access password to the service,
; etc...

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dial-number = phone-string
; this is in many cases composed of different elements
; such as the local phone number, the area code
; (if needed), the international country code
; (if needed), etc...

Note:
the "+" character is reserved for use in global-phone addresses
per [7] and MUST NOT be used as the starting character in a
local-phone string.

phone-string = 1*( DTMF / pause / tonewait / written-sep )

DTMF = ( DIGIT / "#" / "*" / "A" / "B" / "C" / "D" )
; special DTMF codes like "*", "#", "A", "B",
; "C", "D" are defined in [6]
; Important Note: these elements only apply for
; alphabetic strings used in DTMF operations.
; They are NOT applicable for the alphabetic
; characters that are mapped to digits on phone
; keypads in some countries.

pause = "p"

tonewait = "w"

The written-sep element is defined in [1], section 2.1.

Note:
"pause" and "tonewait" character interpretation in local-phone
numbers depends on the specific MTA implementation. Thus its exact
meaning is not defined here. Both "pause" and "tonewait" are case
insensitive.

Important Note:
A local-phone specification is a sequence which should be used
only by the destination MTA specified by mta-I-pstn (see [1],
section 3). Per [12], other MTAs should transfer the message
without modifying the LHS.

2.2 The sub-addr-spec element

In GSTN service there are cases where a sub-addr-spec is required to
specify the final destination. In particular there are ISDN
subaddresses [7], which apply for various services, whereas other
subaddress types may be service specific (see the fax service T.33
subaddress [8], [2]).

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Within actual telephone operations there may be cases where different
types of subaddresses are used as part of a single complete address.
Therefore, the sub-addr-spec syntax definition which follows defines
the subaddress element for the context of ISDN use; the T.33
subaddress element is defined in [2], section 2.

The definition of sub-addr-spec is:

sub-addr-spec = [ isdn-sep isub-addr ]

In detail:

isdn-sep = "/ISUB="
; note that "/ISUB=" is case INSENSITIVE

isub-addr = 1*( DIGIT )

isub-addr =/ 1*( DIGIT / written-sep )

The IANA registration form for sub-addr-spec is given in appendix D.2

2.3 The post-sep and post-dial elements

In some cases, after the connection with the destination GSTN device
has been established, a further dialling sequence is required to
access further services. A typical example is an automated menu-
driven service using DTMF sequences. These cases may be handled using
"post-sep" and "post-dial" elements as defined below:

post-sep = "/POSTD="
; note that "/POSTD=" is case INSENSITIVE

post-dial = phone-string

The IANA registration form for post-sep and post-dial are given in
appendix D.3

3. The pstn-recipient

There are some application where it is valuable to supplement the
pstn-mbox element with additional details. Common examples include
the use of originator and/or recipient names and physical addresses,
particularly in the context of onramp and/or offramp gateways.

The optional pstn-recipient element provides support for such
details.

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RFC 2846 GSTN Address Extensions in E-mail Services June 2000

As an example, when an offramp fax gateway is involved, the
pstn-recipient element could be used to specify the intended
recipient on a fax cover page, and the fax cover page headers could
be qualified using the originator pstn-recipient information.

In the interest of a compact syntax, the pstn-recipient element may
be used to support both originator and recipient addresses. For all
cases within the ABNF definitions to follow, the elements labelled
with "recipient" may also be used for originator information.

The pstn-recipient is a sequence of qualif-type1 elements as defined
below:

pstn-recipient = [ recipient-name ]
[ 1*( recipient-qualifier ) ]

As a consequence, the extended definition of pstn-address becomes:

pstn-address = pstn-mbox [ qualif-type1 ]

pstn-address =/ pstn-mbox [ pstn-recipient ] [ qualif-type1 ]

The definition for qualif-type1 elements is contained in [1] section
2.

3.1 The recipient-name

The recipient-name specifies the personal name of the originator
and/or recipient:

recipient-name = "/ATTN=" pers-name

pers-name = [ givenname "." ]
[ initials "." ]
surname

The following definitions come directly from the MIXER specification
[3]:

surname = printablestring

givenname = 1*( DIGIT / ALPHA / SP / "'" / "+" /
"," / "-" / "/" / ":" / "=" / "?" )

initials = 1*ALPHA

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Note:
the "initials" element can specify the middle initial which is
common in some countries; however it is also possible to support
multiple initials, which may be commonly used in other countries.
This allows the complete set of givennames initials in any
possible combination. See examples at section 5.2

It is essential to remember that the "pstn-address" element (in all
its components and extensions) MUST strictly follow the "quoting
rules" specified in the relevant e-mail standards [11], [12].

The IANA registration form for recipient-name is given in appendix
D.4.

3.2 The extensible recipient-qualifier

The recipient-name is sometimes not enough to specify completely the
originator and/or recipient. An additional set of optional elements,
whose specific definition is in most cases application dependent, is
thus defined:

recipient-qualifier = ( qualif-type1 / qualif-type2 )

The recipient-qualifier is a qualif-type1 element, and contains a
qualif-type1 element in a recursive definition which allows an
extensible format. The purpouse of qualif-type2 element is to permit
additional extensibility for items which go beyond the scope of those
defined for use with the qualif-type1 element.

A series of qualif-type2 elements are defined below:

qualif-type2 = "/" qual2-label "=" string

qual2-label = "ORG" / "OFNO" / "OFNA" / "STR" / "ADDR"
"ADDU" / "ADDL" / "POB" / "ZIP" / "CO"

string = PCHAR
; note that printable characters are %x20-7E

printablestring = 1*( DIGIT / ALPHA / SP /
"'" / "(" / ")" / "+" / "," / "-" /
"." / "/" / ":" / "=" / "?" )
; this definition comes from ITU F.401 [9]
; and MIXER [3]

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Table 1 includes short definition of qual2-label fields:

Table 1 - qual2-label

qual2-label Description
-----------------------------------------------------------------
"ORG" Organization Name for Physical Delivery (example: ACME
Inc)

"OFNO" Office Number for physical delivery (example: BLD2-44)

"OFNA" Office Name for physical delivery (example: Sales)

"STR" Street address for physical delivery (example:
45, Main Street)

"ADDR" Unformatted postal address for physical delivery
(example: HWY 14, Km 94.5 - Loc. Redhill)

"ADDU" Unique postal name for physical delivery (example:
ACMETELEX)

"ADDL" Local postal attributes for physical delivery (example:
Entrance 3, 3rd floor, Suite 296)

"POB" Post Office Box for physical delivery

"ZIP" Postal ZIP code for physical delivery

"CO" Country Name for physical delivery
-----------------------------------------------------------------

One or a combination of some of the above elements is usually enough
to exactly specify the originator and/or recipient of the message.
The use of a large number of these elements could in fact create a
very long recipient-qualifier. Thus, only the strictly needed
elements SHOULD be used. The maximum total length of the pstn-email
MUST in fact not exceed the limits specified in the relevant e-mail
standards [11] [12].

IMPORTANT NOTE: Although the meaning of the above elements is derived
directly from similar elements available in F.401 specification [9],
the naming convention used in this document is explicitly different.
In this way a conflict is avoided with related X.400 addressing
rules. Other specification which use the extension mechanism of this
document to define new qualif-type1 elements which overlap with F.401
are cautioned to create new labels which are different than those
used in F.401.

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RFC 2846 GSTN Address Extensions in E-mail Services June 2000

The IANA registration form for these elements is given in appendix
D.5 to D.14.

4. Multiple sub-addr-spec cases

There are some instances in GSTN applications where multiple
subaddresses are used: T.33 subaddresses in fax service are one of
these cases. In e-mail practice a separate and unique e-mail address
is always used for each recipient; as such, if multiple subaddresses
are present, the use of multiple "pstn-email" elements [1] is
REQUIRED.

Implementors' note:
The UA MAY accept multiple subaddress elements for the same
global-phone, but it MUST generate multiple "pstn-mbox" elements
when submitting the message to the MTA.

5. Examples

In order to clarify the specification we present here a limited set
of examples. Many of the examples refer to the fax service, but also
additional possible services are included. Check also the examples in
[1] and [2] for additional information. Please note that all the
examples are for illustration purpouses, only.

5.1 pstn-mbox examples

A pstn-mbox address in Italy for the fax service, dialled from
U.S.A., using local-phone, without sub-addr-spec and without
written-sep:

FAX=0103940226338

A pstn-mbox address in Germany for an hypothetical XYZ service, using
global-phone, with ISDN sub-addr-spec 1234 and written-sep ".":

XYZ=+49.81.7856345/ISUB=1234

A pstn-mbox address in U.S.A. for fax service, using global-phone,
with T.33 sub-addr-spec 8745, with written-sep "-" and post-dial
sequence p1w7005393w373

FAX=+1-202-455-7622/T33S=8745/PostD=p1w7005393w373

A pstn-mbox address in Italy for fax service, using local-phone,
dialed from an MTA in Germany, (international access code "00", with
ISDN subaddress 9823, with T.33 subaddress "4312" and without pause
or written-sep:

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RFC 2846 GSTN Address Extensions in E-mail Services June 2000

FAX=003940226338/Isub=9823/T33S=4312

The same pstn-mbox address in Italy, using local-phone dialed from an
MTA in Italy (long distance call), with long distant access "0", with
exit-code "9", T.33 subaddress "4312", pause "p" and written-sep ".":

FAX=9p040p22.63.38/t33s=4312

A pstn-mbox address in North America for hypothetical service XYZ,
using global-phone, without sub-addr-spec and written-sep "-" and
".":

XYZ=+1.202.344-5723

A pstn-mbox address for fax service in France, using local-phone
dialed from an MTA in France (long distance call), with exit-code
"0", T.33 subaddress "3345" and pause "p":

FAX=0p0134782289/T33s=3345

A pstn-mbox address for fax service in North America, using local-
phone, without sub-addr-spec, without local-number, using only post-
dial sequences to reach numbers stored in a locally defined short-
dial numbers database, where 6743 is an access password, and 99p51 is
the sequence to access the local short-dial number:

FAX=/postd=w6743w99p51

5.2 pstn-recipient examples

Here are a number of pstn-recipient examples. Please note that pstn-
recipient is just an optional element, and thus a pstn-mbox element
also is required in a pstn-address.

A pstn-recipient using only recipient-name, with givenname initials
and surname:

/ATTN=Tom.J.Smiths

A pstn-recipient using only recipient-name, with givenname, a
complete set of initials (including the first name initial "C") and
surname (where the "real life" givennames are "Carlo Maria Luis
Santo" and the surname is "Nascimento"):

/ATTN=Carlo.CMLS.Nascimento

A pstn-recipient using only recipient-name, with givenname and
surname:

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RFC 2846 GSTN Address Extensions in E-mail Services June 2000

/ATTN=Mark.Collins

A pstn-recipient using only recipient-name, with surname only:

/ATTN=Smiths

A pstn-recipient using recipient-name, and one recipient-qualifier
element:

/ATTN=J.Smiths/OFNA=Quaility-control

A pstn-recipient using two recipient-qualifier extension, only:

/OFNO=T2-33A/OFNA=Quality-Ccontrol

A fax-recipient using some recipient-qualifier for physical delivery:

/STR=45, Main.Street/OFNA=Sales.dept

5.3 pstn-address examples

Some pstn-address examples, obtained combining elements from previous
examples. There are complete addresses which can be used as "local
part" (LHS) element of an e-mail address.

Without optional pstn-recipient (fax service):

FAX=+12023445723

With pstn-recipient (XYZ service):

XYZ=+3940226338/ATTN=Mark.Collins

With pstn-recipient made of two recipient-qualifier extensions (fax
service):

FAX=9p040p22.63.38/t33s=4312/ofno=T2-33A/OFNA=Q-C

5.4 pstn-email examples

Here are the same addresses as before, where "faxgw" is the
mta-I-pstn field for the fax service.

FAX=+12023445723@faxgw

FAX=+39-40-226338/ATTN=Mark.Collins@faxgw

FAX=9p040p226338/T33S=4312/OFNO=T2-33A/OFNA=Q-C@faxgw

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RFC 2846 GSTN Address Extensions in E-mail Services June 2000

FAX=+39040226338/ATTN=Mark.Collins/@faxgw

NOTE: the optional "/" in front for the "@" sign can be generated by
gateways to other services, like MIXER [3].

5.5 A complete SMTP transaction example:

Here is an example of complete SMTP transaction.

S: <listening on SMTP port>
C: <opens connection to SMTP port>
S: 220 foo.domain.com ESMTP service ready
C: EHLO pc.mailfax.com
S: 250 foo.domain.com says hello
C: MAIL FROM:<[email protected]>
S: 250 <[email protected]> Sender ok
C: RCPT TO:<[email protected]>
S: 250 <FAX=+3940226338> recipient ok
C: DATA
S: 354 Enter your data
C: From: Thomas Blake <[email protected]>
C: To: Jim Burton <[email protected]>
C: Subject: Hello there
C: MIME-version: 1.0
C: Date: Mon, 01 Sep 1997 18:14:23 -0700
C: Content-Type: multipart/mixed; boundary=16820115-1435684603#2306
C:
C: This is a MIME message. It contains a
C: TIFF fax bodypart
C:
C: --16820115-1435684603#2306
C: Content-Type: image/TIFF
C: Content-Transfer-Encoding: BASE64
C: Content-Description: FAX
C:
C: ABAA745HDKLSW932ALSDL3ANCVSASDFLALSDFA
C: 87AASS2999499ASDANASDF0000ASDFASDFNANN
C: 87BBHDXBADS00288SADFNAZBZNNDNNSNNA11A0
C: H8V73KS0C8JS6BFJEH78CDWWDUJEDF7JKES8==
C: --16820115-1435684603#2306--
C: .
S: 250 Okay
C: QUIT
S: 221 Goodbye

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RFC 2846 GSTN Address Extensions in E-mail Services June 2000

6. Conclusion

This proposal creates a standard set of extensions for GSTN
addresses, enriching the existing minimal specification [1]. The
proposal is consistent with existing e-mail standards, but allows a
more detailed GSTN address specification, including per originator
and/or recipient specific elements. The IANA registration mechanism
to permit the addition of new services and qualifiers using the GSTN
addresses is also provided.

7. Security Considerations

This document specifies a means by which GSTN addresses and more can
be encoded into e-mail addresses. Since e-mail routing is determined
by Domain Name System (DNS) data, a successful attack to DNS could
disseminate tampered information, which causes e-mail messages to be
diverted via some MTA or Gateway where the security of the software
has been compromised.

There are several means by which an attacker might be able to deliver
incorrect mail routing information to a client. These include: (a)
compromise of a DNS server, (b) generating a counterfeit response to
a client's DNS query, (c) returning incorrect "additional
information" in response to an unrelated query. Clients SHOULD ensure
that mail routing are based only on authoritative answers. Once DNS
Security mechanisms [7] become more widely deployed, clients SHOULD
employ those mechanisms to verify the authenticity and integrity of
mail routing records.

Some GSTN service require dialing of private codes, like Personal
Identification Numbers, to dial a G3 fax recipient or to access
special services. As e-mail addresses are transmitted without
encoding over the MTAs transport service, this could allow
unauthorized people to gain access to these codes when used inside
local-phone. More over these codes might appear in some cases in the
originator and/or recipient addresses on cover pages delivered via
offramp gateways to G3 fax recipients. Senders SHOULD be provided
methods to prevent this disclosure, like code encryption, or
masquerading techniques: out-of-band communication of authorization
information or use of encrypted data in special fields are the
available non-standard techniques.

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RFC 2846 GSTN Address Extensions in E-mail Services June 2000

8. Appendix A: Collected ABNF Syntax

In this section we provide a summary of ABNF specifications defining
both the minimal [1] and the extended elements of pstn-address.

pstn-email = ["/"] pstn-address ["/"] "@" mta-I-pstn

mta-I-pstn = domain

pstn-address = pstn-mbox [ qualif-type1 ]

pstn-address =/ pstn-mbox [ pstn-recipient ] [ qualif-type1 ]

pstn-mbox = service-selector "=" global-phone

pstn-mbox =/ service-selector "=" gstn-phone
[ sub-addr-spec ] [post-sep post-dial]

service-selector = 1*( DIGIT / ALPHA / "-" )

qualif-type1 = "/" keyword "=" string

keyword = 1*( DIGIT / ALPHA / "-" )

string = PCHAR

gstn-phone = ( global-phone / local-phone )

global-phone = "+" 1*( DIGIT , written-sep )

local-phone = [ exit-code ] [ dial-number ]

exit-code = phone-string

dial-number = phone-string

phone-string = 1*( DTMF / pause / tonewait / written-sep )

DTMF = ( DIGIT / "#" / "*" / "A" / "B" / "C" / "D" )

written-sep = ( "-" / "." )

pause = "p"

tonewait = "w"

sub-addr-spec = [ isdn-sep isub-addr ]

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RFC 2846 GSTN Address Extensions in E-mail Services June 2000

isdn-sep = "/ISUB="

isub-addr = 1*( DIGIT )

isub-addr =/ 1*( DIGIT / written-sep )

post-sep = "/POSTD="

post-dial = phone-string

pstn-recipient = [ recipient-name ]
[ 1*( recipient-qualifier ) ]

recipient-name = "/ATTN=" pers-name

pers-name = [ givenname "." ]
[ initials "." ]
surname

surname = printablestring

givenname = 1*( DIGIT / ALPHA / SP / "'" / "+" /
"," / "-" / "/" / ":" / "=" / "?" )

initials = 1*ALPHA

recipient-qualifier = ( qualif-type1 / qualif-type2 )

qualif-type2 = "/" qual2-label "=" string

qual2-label = "ORG" / "OFNO" / "OFNA" / "STR" / "ADDR"
"ADDU" / "ADDL" / "POB" / "ZIP" / "CO"

printablestring = 1*( DIGIT / ALPHA / SP /
"'" / "(" / ")" / "+" / "," / "-" /
"." / "/" / ":" / "=" / "?" )

10. Appendix B: IANA Considerations

As the service-selector and qualif-type1 elements values are
extensible ones, they MUST be registered with IANA.

To register a service-selector or a qualif-type1 element, the
registration form templates given in B.1 and B.2 MUST be used. Any
new registration MUST fulfill the "Specification Required" criterion,
as defined in RFC 2434, section 2 [13]:

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RFC 2846 GSTN Address Extensions in E-mail Services June 2000

"Specification Required - Values and their meaning MUST be
documented in an RFC or other permanent and readily available
reference, in sufficient detail so that interoperability
between independent implementations is possible."

IANA MUST NOT accept registrations which are not supplemented by a
Specification as defined above and which are not fully specified
according to the template forms given in B.1 and B.2. In case of need
for further consultation about accepting a new registration, IANA
SHOULD refer to the Application Area Director to be directed to the
appropriate "expert" individual or IETF Working Group.

After successful registration, IANA should publish the registered new
element in the appropriate on-line IANA WEB site, and include it into
the updates of the "Assigned Numbers" RFC series.

B.1: IANA Registration form template for new values of GSTN address
service-selector

To: [email protected]
Subject: Registration of new values for the GSTN address
service-selector specifier "foo"

service-selector name:

foo

Description of Use:

foo - ("foo" is a fictional new service-selector used in this
template as an example, it is to be replaced with the new value
being registered. Include a short description of the use of the
new value here. This MUST include reference to Standard Track RFCs
and eventually to other Standard Bodies documents for the complete
description; the use of the value must be defined completely
enough for independent implementation).

Security Considerations:

(Any additional security considerations that may be introduced by
use of the new service-selector parameter should be defined here
or in the reference Standards Track RFCs)

Person & email address to contact for further information:

(fill in contact information)

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INFORMATION TO THE SUBMITTER:

The accepted registrations will be listed in the "Assigned Numbers"
series of RFCs. The information in the registration form is freely
distributable.

B.2: IANA Registration form template for new values of GSTN
address qualif-type1 keyword and value

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "bar"

qualif-type1 "keyword" name:

bar

qualif-type1 "value" ABNF definition:

abnf - ("abnf" MUST define the ABNF form of the qualif-type1 value.
The ABNF specification MUST be self-contained, using as basic
elements the tokens given in specification [4]. To avoid any
duplication (when appropriate), it MUST also use as building
non-basic tokens any already registered non-basic token from other
qualif-type1 elements, i.e. it MUST use the same non-basic token
name and then repeat its identical ABNF definition from basic
tokens; see appendix E for examples).

Description of Use:

bar - ("bar" is a fictional description for a new qualif-type1
element used in this template as an example. It is to be replaced
by the real description of qualif-type1 element being registered.
Include a short description of the use of the new qualif-type1
here. This MUST include reference to Standards Track RFCs and
eventually to other Standard Bodies documents for the complete
description; the use of the value MUST be defined completely
enough for independent implementation.)

Use Restriction:

(If the new qualif-type1 elements is meaningful only for a
specific set of service-element, you MUST specify here the list of
allowed service-element types. If there is no restriction, then
specify the keyword "none")

Allocchio Standards Track [Page 17]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Security Considerations:

(Any additional security considerations that may be introduced by
use of the new service-selector parameter should be defined here
or in the reference Standards Track RFCs)

Person & email address to contact for further information:

(fill in contact information)

INFORMATION TO THE SUBMITTER:

The accepted registrations will be listed in the "Assigned Numbers"
series of RFCs. The information in the registration form is freely
distributable.

11. Appendix C: IANA Registration form for new value of GSTN
address service-selector "FAX"

To: [email protected]
Subject: Registration of new values for the GSTN address
service-selector specifier "FAX"

service-selector name:

FAX

Description of Use:

FAX - specify that the GSTN address refers either to an
Internet Fax device, or an onramp/offramp Fax gateway.

For a complete description refer to RFC 2304 and RFC 2303

Security Considerations:

See the Security Consideration section of RFC 2304.

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

Allocchio Standards Track [Page 18]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

12. Appendix D: IANA Registration forms for new values of GSTN
address qualit-type1 keyword and value

D.1 - T33S

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "T33S"

qualif-type1 "keyword" name:

T33S

qualif-type1 "value" ABNF definition:

sub-addr = 1*( DIGIT )

Description of Use:

T33S is used to specify the numeric only optional fax sub-address
element described in "ITU T.33 - Facsimile routing utilizing the
subaddress; recommendation T.33 (July, 1996)". Further detailed
description is available in RFC 2304.

Use Restriction:

The use of "T33S" is restricted to "FAX" service-selector, is it
has no meaning outside the fax service.

Security Considerations:

See the Security Consideration section of RFC 2304.

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

Allocchio Standards Track [Page 19]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.2 - ISUB

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "ISUB"

qualif-type1 "keyword" name:

ISUB

qualif-type1 "value" ABNF definition:

isub-addr = 1*( DIGIT )

isub-addr =/ 1*( DIGIT / written-sep )

written-sep = ( "-" / "." )

Description of Use:

"ISUB" is used to specify the optional ISDN sub-address elements used
in ISDN service to reach specific objects on the ISDN service. It can
eventually embed written separator elements for the only scope to
enhance human readability. See RFC 2846 for further details.

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Allocchio Standards Track [Page 20]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.3 - POSTD

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "POSTD"

qualif-type1 "keyword" name:

POSTD

qualif-type1 "value" ABNF definition:

phone-string = 1*( DTMF / pause / tonewait / written-sep )

DTMF = ( DIGIT / "#" / "*" / "A" / "B" / "C" / "D" )

pause = "p"

tonewait = "w"

written-sep = ( "-" / "." )

Description of Use:

POSTD is the optional further dialling sequence needed to access
additional services (for example a menu' driven interface)
available after the service site has been accessed using
gstn-phone. See RFC 2846 for further details.

Allocchio Standards Track [Page 21]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.4 - ATTN

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "ATTN"

qualif-type1 "keyword" name:

ATTN

qualif-type1 "value" ABNF definition:

pers-name = [ givenname "." ] [ initials "." ] surname

surname = printablestring

givenname = 1*( DIGIT / ALPHA / SP / "'" / "+" /
"," / "-" / "/" / ":" / "=" / "?" )

initials = 1*ALPHA

printablestring = 1*( DIGIT / ALPHA / SP /
"'" / "(" / ")" / "+" / "," / "-" /
"." / "/" / ":" / "=" / "?" )

Allocchio Standards Track [Page 22]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Description of Use:

To specify the personal name of the individual intended as the
originator or the recipient of the message. See RFC 2846 for
further details.

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.5 - ORG

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "ORG"

qualif-type1 "keyword" name:

ORG

qualif-type1 "value" ABNF definition:

string = PCHAR

Description of Use:

To specify the Organization Name (example: ACME Inc.) See RFC 2846
for further details.

Allocchio Standards Track [Page 23]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.6 - OFNO

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "OFNO"

qualif-type1 "keyword" name:

OFNO

qualif-type1 "value" ABNF definition:

string = PCHAR

Description of Use:

To specify the Office Number (example: BLD2-44) See RFC 2846
for further details.

Use Restriction:

none.

Allocchio Standards Track [Page 24]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Security Considerations:

See the Security Consideration section of RFC 2846.

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.7 - OFNA

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "OFNA"

qualif-type1 "keyword" name:

OFNA

qualif-type1 "value" ABNF definition:

string = PCHAR

Description of Use:

To specify the Office Name (example: Sales) See RFC 2846
for further details.

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Allocchio Standards Track [Page 25]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.8 - STR

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "STR"

qualif-type1 "keyword" name:

STR

qualif-type1 "value" ABNF definition:

string = PCHAR

Description of Use:

To specify the Street Address (example: 45, Main Street).
See RFC 2846 for further details.

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Allocchio Standards Track [Page 26]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.9 - ADDR

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "ADDR"

qualif-type1 "keyword" name:

ADDR

qualif-type1 "value" ABNF definition:

string = PCHAR

Description of Use:

To specify the Unformatted Postal Address (example: HWY 14,
Km 94.5 - Loc. Redhill). See RFC 2846 for further details.

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Allocchio Standards Track [Page 27]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.10 - ADDU

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "ADDU"

qualif-type1 "keyword" name:

ADDU

qualif-type1 "value" ABNF definition:

string = PCHAR

Description of Use:

To specify the Unique Postal Name (example: ACMETELEX). See
RFC 2846 for further details.

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Allocchio Standards Track [Page 28]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.11 - ADDL

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "ADDL"

qualif-type1 "keyword" name:

ADDL

qualif-type1 "value" ABNF definition:

string = PCHAR

Description of Use:

To specify the Local Postal Attributes (example: Entrance 3,
3rd floor, Suite 296). See RFC 2846 for further details.

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Allocchio Standards Track [Page 29]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.12 - POB

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "POB"

qualif-type1 "keyword" name:

POB

qualif-type1 "value" ABNF definition:

string = PCHAR

Description of Use:

To specify the Post Office Box (example: CP 1374). See RFC 2846
for further details.

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Allocchio Standards Track [Page 30]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.13 - ZIP

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "ZIP"

qualif-type1 "keyword" name:

ZIP

qualif-type1 "value" ABNF definition:

string = PCHAR

Description of Use:

To specify Postal ZIP code (example: I 34012). See RFC 2846
for further details.

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Allocchio Standards Track [Page 31]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

D.14 - CO

To: [email protected]
Subject: Registration of new values for the GSTN address
qualif-type1 element "CO"

qualif-type1 "keyword" name:

CO

qualif-type1 "value" ABNF definition:

string = PCHAR

Description of Use:

To specify the Country Name (example: Belgium) See RFC 2846
for further details.

Use Restriction:

none.

Security Considerations:

See the Security Consideration section of RFC 2846.

Allocchio Standards Track [Page 32]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

Person & email address to contact for further information:

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

13. Author's Address

Claudio Allocchio
INFN-GARR
c/o Sincrotrone Trieste
SS 14 Km 163.5 Basovizza
I 34012 Trieste
Italy

RFC822: [email protected]
X.400: C=it;A=garr;P=Trieste;O=Elettra;
S=Allocchio;G=Claudio;
Phone: +39 040 3758523
Fax: +39 040 3758565

14. References

[1] Allocchio, C., "Minimal PSTN address format in Internet Mail",
RFC 2303, March 1998.

[2] Allocchio, C., "Minimal FAX address format in Internet Mail",
RFC 2304, March 1998.

[3] Kille, S., "MIXER (Mime Internet X.400 Enhanced Relay): Mapping
between X.400 and RFC 822/MIME", RFC 2156, January 1998.

[4] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications", RFC 2234, November 1997.

[5] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.

Allocchio Standards Track [Page 33]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

[6] ETSI I-ETS 300,380 - Universal Personal Telecommunication (UPT):
Access Devices Dual Tone Multi Frequency (DTMF) sender for
acoustical coupling to the microphone of a handset telephone
(March 1995)

[7] ITU E.164 - The International Public Telecommunication Numbering
Plan E.164/I.331 (May 1997)

[8] ITU T.33 - Facsimile routing utilizing the subaddress;
recommendation T.33 (July, 1996)

[9] ITU F.401 - Message Handling Services: Naming and Addressing for
Public Massage Handling Service; recommendation F.401 (August
1992)

[10] ITU F.423 - Message Handling Services: Intercommunication
Between the Interpersonal Messaging Service and the Telefax
Service; recommendation F.423 (August 1992)

[11] Crocker, D., "Standard for the format of ARPA Internet text
messages", STD 11, RFC 822, August 1982.

[12] Braden, R., "Requirements for Internet hosts - application and
support", STD 3, RFC 1123, October 1989.

[13] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA
Considerations Section in RFCs", BCP 26, RFC 2434, October 1998.

Allocchio Standards Track [Page 34]

RFC 2846 GSTN Address Extensions in E-mail Services June 2000

15. Full Copyright Statement

Copyright (C) The Internet Society (2000). All Rights Reserved.

This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other than
English.

The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.

This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

Funding for the RFC Editor function is currently provided by the
Internet Society.

Allocchio Standards Track [Page 35]