Cisco SPA301 Administration Manual page 268

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
Dynamic
RTP-Start-Loopback
Codec
AVT Codec Name
G711u Codec Name
G711a Codec Name
G726r16 Codec Name
G726r24 Codec Name
G726r32 Codec Name
Description
RTP-Start-Loopback Dynamic Payload.
Defaults to 113.
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.
A
Cisco SPA525G or
.
Cisco WIP310,
268