Configure ClearMode
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Clearmode is defined in RFC4040 and is fully supported and does not required any special licensing or configuration from the Web portal to enable it.
If the SETUP/IAM message have its Information Transfer Rate and Information Transfer Capability set to 64kbits/sec Unrestricted, the Codec will be force to Clear Channel on the SIP side.
This will result in:
m=audio 0 RTP/AVP 96
a=rtpmap:96 CLEARMODE/8000
By not specifying the ptime, this means it's 20ms.
If you want to use a packetization time different from 20ms, you have to go Profile->RTP and Audio->Clear Channel.
And this will result in a SDP like:
m=audio 0 RTP/AVP 96
a=rtpmap:96 CLEARMODE/8000
a=ptime:10
In the INVITE message, if the SDP is received with Clear Channel SDP (CLEARMODE/8000), the SETUP/IAM ISDN/SS7 Information Transfer Rate and Information Transfer Capability will be set accordingly (64kbits/sec Unrestricted).
Note: The use of Clear Channel is equivalent to the cost of G.711 codec density.
The SDP in the profiles must be updated to support the CLEARMODE. Please go in Profiles -> [select Profile] -> SDP. Add 96 to the "m=audio" line and add this line:
The final output will be something like this:
