Avaya Communication Manager IP DECT, Installation, Administration And Maintenance Manual

Page: 103 / 128

Supported Codecs and Codec negotiation
Issue 1 August 2006 103
Appendix A: Appendix
Supported Codecs and Codec negotiation
Like the CM the ADMM support silence suppression for G.711A and G.711MU, what isn't
standard conform, but the ADMM doesn't support this feature for G.279 or G.729A. Here the
G.729B/G.729AB codecs should be used to decrease the bandwidth. It isn't possible to differ
between G.723.1 5.3K and G.723.1 6.3K codecs in the openLogicalChannel signal. Currently
the Mobility Manager supports G.723.1 6.3K.
Currently the ADMM supports the following codecs (in capability set sent in the following order):
G.711A, G.711MU, G.723.1(SilenceSuppression=TRUE), G.729AB, G.729A, G.729B, G.729
The ADMM waits until it receives openLogicalChannel from the CM before sending it's own
openLogicalChannel signal with the same codec and SilenceSuppression bit (H.245/H.225.0
LogicalChannelParameters) received from the CM.
OpenLogicalChannel (CM==>ADMM) ====> openLogicalChannel(ADMM==>CM)
G.711A H.225.0-SS = FALSE G.711A H.225.0-SS = FALSE
G.711A H.225.0-SS = TRUE G.711A H.225.0-SS = TRUE
G.711MU H.225.0-SS = FALSE G.711MU H.225.0-SS = FALSE
G.711MU H.225.0-SS = TRUE G.711MU H.225.0-SS = TRUE
G.729A H.225.0-SS = FALSE G.729A H.225.0-SS = FALSE
G.729A H.225.0-SS = TRUE G.729A H.225.0-SS = TRUE
G.729B H.225.0-SS = FALSE G.729B H.225.0-SS = FALSE
G.729AB H.225.0-SS = FALSE G.729AB H.225.0-SS = FALSE
G.723.1 SS=FALSE H.225.0-SS = FALSE G.723.1 SS=FALSE H.225.0-SS = FALSE
G.723.1 SS=TRUE H.225.0-SS = TRUE G.723.1 SS=TRUE H.225.0-SS = TRUE
Supported codecs in combination with silence suppression and Voice Activity Detection
respectively:
CM IP-Office IP DECT Standard
G.711A X X X X
G.711A SS X X X
G.711MU X X X X
G.711MU SS X X X
G.729 (X)=>G.729A (X)=>G.729A X
G.729 SS (X)=>G.729A
SS
G.729A X X X X