ITU - munications Standardization Sector.doc.doc

Attention: This is not a publication made available to the public, but an internal ITU-T Document intended only for use by the Member States of the ITU, by ITU-T Sector Members and Associates, and their respective staff and collaborators in their ITU related work. It shall not be made available to, and used by, any other persons or entities without the prior written consent of the ITU-T. ITU - munications Standardization Sector Q1109-031 Study Group 16– Question 11 Loc atio n: Arlington VA, USA. 30 th September –2 nd October 2003 Source: works Title: Mechanism for indicating Support of VBD for SDP based implementations such as and SIP gateways Contact: Dominic Walker works United Kingdom Tel: +44 (0)1279 403379 Fax: +44 (0)1279 402555 Email: @ ABSTRACT This contribution proposes a mechanism for implementations that use SDPs (as per RFC2327, such as SIP terminals/gateways and gateways) and ply with to indicate support of VBD, as well as indicating the codec(s) that shall be used for VBD. This contribution does not preclude the gateways from negotiating support of other mechanisms such as RFC2833, , and/or Text Relay, for transporting non-voice signals. This contribution assumes that RTP shall be used for the transport of VBD. It is based on the e of the last meeting in Dallas (July 2003). 2 Introduction Negotiation of support of VBD da