1
Scope
2 References
3 Terms and definitions
4 Abbreviations
5 Audio codec requirements
5.1 DTMF support
5.2 Fax and modem support
5.3 Echo cancellation support
5.4 Asymmetrical services support
5.5 Hearing-impaired services support
6 Mandatory codecs
6.1 µ-law and A-law support
6.2 Packet loss concealment
7 Additional codecs
7.1 G.728
7.2 G.729 Annex E
8 Optional features
8.1 Wideband codecs
8.2 Optional codecs
8.3 Voice activity detection (VAD)
9 Packetization
Annex A - Session
description of CODECs
Appendix I -Bibliography