Operation Manual

Configuring Security, Quality, and Network Features
Configuring Voice Codecs
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 133
5
To configure the voice codecs on each extension, navigate to Admin Login >
advanced > Voice > Ext_n. Under Audio Configuration, configure the following
parameters:
Parameter Description
Preferred Codec 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 Cisco WIP310,
Cisco SPA525G or Cisco SPA525G2)
• G726-24 (not supported on Cisco WIP310,
Cisco SPA525G or Cisco SPA525G2)
• G726-32 (all models)
• G726-40 (not supported on Cisco WIP310,
Cisco SPA525G or Cisco SPA525G2)
• G729a (all models)
• G723 (not supported on Cisco WIP310,
Cisco SPA525G or Cisco SPA525G2)
• G722 (not supported on Cisco WIP310)
Defaults to G711u.
Use Pref Codec
Only
To use only the preferred codecs for all calls, select yes.
(The call fails if the far end does not support these
codecs.) Otherwise, select no. Defaults to no.
Second Preferred
Codec
If the first codec fails, this codec is tried. Defaults to
unspecified.
Not applicable to the Cisco WIP310.
Third Preferred
Codec
If the second codec fails, this codec is tried. Defaults to
unspecified.
Not applicable to the Cisco WIP310.
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