Intermittently when a call is received from the PSTN, the caller can hear the person they called but the they are unable to be heard. This happens to different phones from different places seemingly randomly. The Call Manager version is 8.5, and the Voice Gateway is MGCP on a 2921 with 2 PRI's from the same carrier. I have had the carrier test the circuits. The issue persisted after the reboot of the voice gateway, but not after the reboot of the Call Manager. This has fixed the issue before, but it always comes back.
If the mgcp bind command is not enabled, the IP layer still provides the best local address.
If its already there, then you should collect the detailed callmanager traces as well as the following debugs from the gateway for a call with one way audio
debug mgcp packets
show call active voice brief
By pressing the '?' on the IP phone you can verify the Tx and Rx packets , if they are incrementing properly. If Rx packets are not increasing then the issue could be with a firewall between the MGCP gateway and cucm or a routing issue. However, as the issue is intermittent, the requested traces / debugs might be needed for exact conclusion.
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