URLs for Telephone Calls
RFC 2806

Document Type RFC - Proposed Standard (April 2000; No errata)
Obsoleted by RFC 3966
Was draft-antti-telephony-url (individual)
Last updated 2013-03-02
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Network Working Group                                    A. Vaha-Sipila
Request for Comments: 2806                                        Nokia
Category: Standards Track                                    April 2000

                        URLs for Telephone Calls

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

   This document specifies URL (Uniform Resource Locator) schemes "tel",
   "fax" and "modem" for specifying the location of a terminal in the
   phone network and the connection types (modes of operation) that can
   be used to connect to that entity. This specification covers voice
   calls (normal phone calls, answering machines and voice messaging
   systems), facsimile (telefax) calls and data calls, both for POTS and
   digital/mobile subscribers.

Table of Contents

   1. Introduction ................................................    2
   1.1 New URL schemes ............................................    2
   1.2 Formal definitions .........................................    3
   1.3 Requirements ...............................................    3
   2. URL schemes for telephone calls .............................    3
   2.1 Applicability ..............................................    3
   2.2 "tel" URL scheme ...........................................    4
   2.3 "fax" URL scheme ...........................................    6
   2.4 "modem" URL scheme .........................................    6
   2.5 Parsing telephone, fax and modem URLs ......................    7
   2.5.1 Call type ................................................    7
   2.5.2 Phone numbers and their scope ............................    7
   2.5.3 Separators in phone numbers ..............................   10
   2.5.4 Converting the number to the local numbering scheme ......   10
   2.5.5 Sending post-dial sequence after call setup ..............   10
   2.5.6 Pauses in dialing and post-dial sequence .................   11
   2.5.7 ISDN subaddresses ........................................   11

Vaha-Sipila                 Standards Track                     [Page 1]
RFC 2806                URLs for Telephone Calls              April 2000

   2.5.8 T.33 subaddresses ........................................   11
   2.5.9 Data call parameters .....................................   12
   2.5.10 Telephony service provider identification ...............   13
   2.5.11 Additional parameters ...................................   14
   2.6 Examples of Use ............................................   14
   2.7 Rationale behind the syntax ................................   15
   2.7.1 Why distinguish between call types?  .....................   15
   2.7.2 Why "tel" is "tel"?  .....................................   16
   2.7.3 Why to use E.164-style numbering? ........................   16
   2.7.4 Not everyone has the same equipment as you ...............   17
   2.7.5 Do not confuse numbers with how they are dialled .........   17
   3. Comments on usage ...........................................   17
   4. References ..................................................   18
   5. Security Considerations .....................................   19
   6. Acknowledgements ............................................   20
   7. Author's Address ............................................   20
   8. Full Copyright Statement ....................................   21

1. Introduction

1.1 New URL schemes

   This specification defines three new URL schemes: "tel", "fax" and
   "modem". They are intended for describing a terminal that can be
   contacted using the telephone network. The description includes the
   subscriber (telephone) number of the terminal and the necessary
   parameters to be able to successfully connect to that terminal.

   The "tel" scheme describes a connection to a terminal that handles
   normal voice telephone calls, a voice mailbox or another voice
   messaging system or a service that can be operated using DTMF tones.

   The "fax" scheme describes a connection to a terminal that can handle
   telefaxes (facsimiles). The name (scheme specifier) for the URL is
   "fax" as recommended by [E.123].

   The "modem" scheme describes a connection to a terminal that can
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