Our customer used to have a cisco voice gateway 2651XM talking H323 to ccm. We had to change the bearer capability for outgoing calls from speech to 3.1Khz audio. This was achieved by:
router(config-if)isdn outgoing-voice info-transfer-capability 3.1khz
Now the customer runs the gateway under MGCP. How can the same thing be done under MGCP? The interface command does not work anymore.