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In a TCCS environment, users are unable to eliminate echo and unable to change input or output levels using voice port gain and attenuation parameters
This is due to a configuration issue with the bearer channel dial-peers. The issue occurs if the codec clear-channel command is issued on the bearer channel dial-peer as well as the signalling dial-peer. Issuing the codec clear-channel command for the bearer timeslots is not supported. The codec clear-channel command does not allow implementation of Voice Activity Detection (VAD), echo canceling, and gain or attenuation. It just passes data from the B-channel as it is. This is the reason for echo.