IN STRICTEST CONFIDENCE
BT Wholesale
Issue 1: 2012© British Telecommunications plc
Page 19 of 33
IN STRICTEST CONFIDENCE
Codec Setup
Under the Codec Setup page the following values should be set. If a value is not discussed then this
should be left as default unless advised otherwise.
Audio Capability Priority
The default value here is G.711_PT and where WAN bandwidth is
not an issue we recommend that this is left.
If you have a requirement to use G.729 as the preferred codec then
the G.729_PT or G.729_Fix profiles should be considered.
The G.729_PT profile will place G729 as the first choice codec in a
list of possible options meaning that G729 should be negotiation in
most call scenarios but is not guaranteed, this profile offers the best
compatibility with other SIP devices.
The G.729_Fix profile will only allow the use of G729 for calls but
reduces the systems compatibility with other SIP devices that do
not support G729.
DTMF Payload Number
101
DTMF Relay Mode
RFC2833
G.722 Maximum Audio Frame Size
20ms
Fax Relay Mode
Checked
T.38 Protocol Mode
UDPTL/RTP