Cisco SPA942 - - IP Phone Administration Manual page 126

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Parameter
Preferred Codec
Use Pref Codec
Only
Second Preferred
Codec
Third Preferred
Codec
G729a Enable
Configuring Security, Quality, and Network Features
Description
Preferred codec for all calls. (The actual codec used in a call
still depends on the outcome of the codec negotiation
protocol.) Select one of the following:
• G711u (all models)
• G711a (all models)
• G726-16 (not supported on WIP310, SPA525G)
• G726-24 (not supported on WIP310, SPA525G)
• G726-32
• G726-40 (not supported on WIP310, SPA525G)
• G729a
• G723 (not supported on WIP310, SPA525G)
• G722 (SPA525G)
See "Supported Codecs" section on page
Defaults to G711u.
To use only the preferred codec for all calls, select yes. (The
call fails if the far end does not support this codec.) Otherwise,
select no.
Defaults to no.
If the first codec fails, this codec is tried.
Defaults to unspecified.
NOTE: Not applicable to the WIP310.
If the second codec fails, this codec is tried.
Defaults to unspecified.
NOTE: Not applicable to the WIP310.
To enable the use of the G.729a codec at 8 kbps, select yes.
Otherwise, select no.
Defaults to yes.
Cisco SPA and Wireless IP Phone Administration Guide
Configuring Voice Codecs
118.