In this call scenario, we have dtmf rfc2833 on cube and OOB on GK side. Hence we need MTP. (NB a xcoder was used for MTP)
My question si this, what determines the codec that MTP uses. In this call, CUCM does not use the the xcoder in the MRGL of the CUBE, which is the device side that invokes MTP. And the reason from cucm trace is that the region between cube and xcoder 1 is g729. hence there were caps mismtach
It then went to select xcoder 2 which had a region setting of G711 to cube.
In summary, what determine the codec that MTP will use? In this case using a xcoder as MTP, why was the call not negotiated using a G729 MTP.
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