I have preaty straight congig LAN --- CCM --- H.323 --- PSTN. CCM is 4.1(2), gateway is 1760 with 12.3(11)T7, connection to PSTN is with three VIC2-2BRI.
Occasionally PSTN side hears static distortions or cant here anything (one-way voice) for both incoming and outgoing calls. When call is closed and same number is immediately redialed there are no problems in conversation.
All this problems happen on different BRI ports, so I dont think this is a telecom problem.
All counters form show interfaces, show controllers bri, show controllers voice dont display any errors.
You definitely need to implement QoS on your switches, what type of switches are you using?
Depending on the switch model you might need to re-map cos-dscp and dscp-cos, so that voice queue is the expedite queue, and add the priority-queue out command on all switchports where phones are connected. Here is a good link for 3550, obviously it's different for all Cisco switch models.
Along with the QoS recommendations by others, when the one way audio happens is it for the entire call (start to finish) or just parts? When this happens if you can keep the problem call up, can you ping between the phone and the gateway fine? ping the phone on the router using the interface the router is sourcing voice traffic from.
If the one-way audio is for the whole call, then it may be another issue where the audio is not working at all for some reason or the audio wasn't cut over right. If you look at the IP phones web page on the problem call under the stream page, is the remote IP address correct (should be gateways IP address on external call).
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