Definition of Events for Channel-Oriented Telephony Signalling
RFC 5244, “Definition of Events for Channel-Oriented Telephony Signalling”, is a Proposed Standard document published in June 2008 by H. Schulzrinne, T. Taylor. It updates RFC 4733. The canonical text is published by the RFC Editor.
Abstract
This memo updates RFC 4733 to add event codes for telephony signals used for channel-associated signalling when carried in the telephony event RTP payload. It supersedes and adds to the original assignment of event codes for this purpose in Section 3.14 of RFC 2833. As documented in Appendix A of RFC 4733, some of the RFC 2833 events have been deprecated because their specification was ambiguous, erroneous, or redundant. In fact, the degree of change from Section 3.14 of RFC 2833 is such that implementations of the present document will be fully backward compatible with RFC 2833 implementations only in the case of full ABCD-bit signalling. This document expands and improves the coverage of signalling systems compared to RFC 2833. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 5244 is hosted at rfc-editor.org. Available in TXT,HTML.
- RFC 5243 OSPF Database Exchange Summary List Optimization
- RFC 5242 A Generalized Unified Character Code: Western European and CJK Sections
- RFC 5246 The Transport Layer Security Protocol Version 1.2
- RFC 5241 Naming Rights in IETF Protocols
- RFC 5247 Extensible Authentication Protocol Key Management Framework
- RFC 5240 Protocol Independent Multicast Bootstrap Router MIB
- RFC 5248 A Registry for SMTP Enhanced Mail System Status Codes
- RFC 5239 A Framework for Centralized Conferencing