Cisco 521SG - Unified IP Phone VoIP Administration Manual page 244

Cisco SPA IP Phone Field Reference
SIP Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
Parameter
RTP-Start-Loopback
Codec
AVT Codec Name
G711u Codec Name
G711a Codec Name
G726r16 Codec Name
G726r24 Codec Name
G726r32 Codec Name
G726r40 Codec Name
G729a Codec Name
Description
RTP-Start-Loopback Codec. Select one of
following: G711u, G711a, G726-16, G726-24,
G726-32, G726-40, G729a, or G723.
Cisco SPA525G or Cisco SPA525G2: G711u,
G711a, G726-32, G729a, G722.
Defaults to G711u.
AVT codec name used in SDP.
Defaults to telephone-event.
G.711u codec name used in SDP.
Defaults to PCMU.
G.711a codec name used in SDP.
Defaults to PCMA.
G.726-16 codec name used in SDP.
Defaults to G726-16.
NOTE Not applicable to
Cisco SPA525G2 Cisco WIP310
or
G.726-24 codec name used in SDP.
Defaults to G726-24.
NOTE Not applicable to
Cisco SPA525G or Cisco SPA525G2.
G.726-32 codec name used in SDP.
Defaults to G726-32.
G.726-40 codec name used in SDP.
Defaults to G726-40.
NOTE Not applicable to
Cisco SPA525G2 Cisco WIP310
or
G.729a codec name used in SDP.
Defaults to G729a.
A
Cisco SPA525G or
.
Cisco WIP310,
Cisco SPA525G or
.
243