Can you confirm that you have bound h323-gateway to specific ip address under the interface which the CallManager endpoint is configure to?
ip address 192.168.1.1 255.255.255.0
h323-gateway voip interface
h323-gateway voip bind srcaddr 192.168.1.1
Another possibilities is that the answer supervision does not get sent correctly when the called device beyond the telco answers the call.
In this instance, failure to receive the answer supervision will cause the gateway not to cut through the audio path in a forward direction which causes one-way voice.
A workaround involves the need to configure 'voice rtp send-recv on' in global configuration.
In some cases you need to establish a two-way audio path as soon as the RTP channel is opened-before the connect message is received from the telco. Try using the command 'voice rtp send-recv' in global configuration.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...