RFC 2806 (rfc2806) - Page 2 of 21
URLs for Telephone Calls
Alternative Format: Original Text Document
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 handle incoming data calls. The term "modem" refers to a device that does digital-to-analog and analog-to-digital conversions; in addition to these, a "modem" scheme can describe a fully digital connection. The notation for phone numbers is the same which is specified in [RFC 2303] and [RFC 2304]. However, the syntax definition is a bit different due to the fact that this document specifies URLs whereas [RFC 2303] and [RFC 2304] specify electronic mail addresses. For example, "/" (used in URLs to separate parts in a hierarchical URL [RFC 2396]) has been replaced by ";". In addition, this URL scheme has been synchronized with [RFC 2543]. Vaha-Sipila Standards Track
