Go to the inbound and outbound dial-peers on the CUBE. On the dial-peer enter the command
codec ilbc mode #
where # is the lower of the two ptime values. In this instance 20 (from CME side) is lower so the command for this scenario is
codec ilbc mode 20
A little better way:
We can tell CUBE to passthru the SDP. I recommend doing it on the dial-peer instead of doing it globally:
CUBE#conf t Enter configuration commands, one per line. End with CNTL/Z. CUBE(config)#dial-peer voice <tag> CUBE(config-dial-peer)#voice-class sip pass-thru content sdp CUBE(config-dial-peer)#end CUBE#wr Building configuration...
Even better way:
Create a voice class codec and have one of the codec preferences be ilbc mode 20
voice class codec 1
cod pref 1 g711u
cod pref 2 ilbc mode 20
Then apply the voice-class codec 1 to your dial-peers as needed.
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