Cisco SPA IP Phone Field Reference
Ext Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 344
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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, G711a, G722, G726-16, G726-24, G726-32,
G726-40, G729a, or G723.
Cisco SPA525G or Cisco SPA525G2: G711u, G711a,
G726-32, G729a, and G722. G.723 (not available on
Cisco SPA300 Series or Cisco SPA500 Series). G722
not available on Cisco WIP310.
Defaults to G711u.
Use Pref Codec Only 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.
Second Preferred
Codec
The second preferred codec when the preferred
codec cannot be used. If
Use Pref Codec Only i
s
enabled (set to yes), this parameter is not used.
Defaults to Unspecified.
Third Preferred Codec The third preferred codec when the preferred codec
and second preferred codec cannot be used. If
Use
Pref Codec Only i
s enabled (set to yes), this parameter
is not used.
Defaults to Unspecified.
G711u Enable Enables use of the G711u codec. Defaults to yes.
G711a Enable Enables use of the G711a codec. Defaults to yes.
G729a Enable To enable the use of the G.729a codec at 8 kbps,
select yes. Otherwise, select no.
Defaults to yes.
G722 Enable Enables use of the G.722 codec. Defaults to yes.
NOTE Not applicable to the Cisco WIP310.