Transcoding is required to enable communication between different Codecs. For example, CUE is G.711 only and will not be reachable from a Branch side if Inter-region codec has been set as G.729. Similarly a UCCX Pilot point is G.711 only and cannot be reached from another site using G.729 codec. To make this communication possible, a transcoder sitting at terminating gateway do media conversion from one codec to another.
Setting up a IOS transcoder is same as Conference Bridge.
At the gateway use the following commands:
voice-card 0
dspfarm
dsp services dspfarm
sccp local Loopback0
sccp ccm 10.10.210.10 identifier 2 priority 2 version 5.0.1
sccp ccm 10.10.210.11 identifier 1 priority 1 version 5.0.1
sccp
!
sccp ccm group 1
bind interface Loopback0
associate ccm 1 priority 1
associate ccm 2 priority 2
associate profile 1 register HQXcode
!
dspfarm profile 1 transcode
codec g729r8
maximum sessions 2
associate application SCCP
no shut
!
At the Call manager under Media Resources > Transcoder
Verfication:
Show sccp connection
show dspfarm session
show dspfarm all
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