Having problems with one way audio to specific numbers. Voip to PSTN results in not being able to hear anyone at the receiving end but if someone at those numbers calls back, the audio is fine both ways.
Tried adding voice rtp send-recv to the gateway but that did not help.
CallManager is 3.3(5)
Phone load is 7.1(1)
Anyone have any good tricks to isolate where the problem is?