Network Working Group B. Foster
Request for Comments: 3661 C. Sivachelvan
Updates: 3435 Cisco Systems
Category: Informational December 2003
Media Gateway Control Protocol (MGCP) Return Code Usage
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This document provides implementation guidelines for the use of
return codes in RFC 3435, Media Gateway Control Protocol (MGCP)
Version 1.0. Return codes in RFC 3435 do not cover all possible
specific situations that may ever occur in a gateway. That is not
possible and not necessary. What is important is to ensure that the
Call Agent that receives a return code behaves appropriately and
consistently for the given situation. The purpose of this document
is to provide implementation guidelines to ensure that consistency.
Table of Contents
1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2. Document Organization . . . . . . . . . . . . . . . . . 2
2. Return Code Usage . . . . . . . . . . . . . . . . . . . . . . 2
2.1. Return Code Categories. . . . . . . . . . . . . . . . . 2
2.2. Return Code Situations and Categories . . . . . . . . . 3
2.3. Summary of Return Code Categories . . . . . . . . . . . 19
3. Additional Guidelines . . . . . . . . . . . . . . . . . . . . 21
3.1. Gateway Recommendations . . . . . . . . . . . . . . . . 21
3.2. Call Agent Recommendations. . . . . . . . . . . . . . . 21
4. Security Considerations . . . . . . . . . . . . . . . . . . . 22
5. Acknowledgements. . . . . . . . . . . . . . . . . . . . . . . 22
6. Normative References. . . . . . . . . . . . . . . . . . . . . 22
7. Authors' Addresses. . . . . . . . . . . . . . . . . . . . . . 23
8. Full Copyright Statement. . . . . . . . . . . . . . . . . . . 24
Foster & Sivachelvan Informational