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One way voice transmission issues

I have two 3640's connected via a serial HDLC point to point circuit. Both routers can ping and telnet each other and have full data connectivity. However, the problem is when router A calls Router B, the calls connects, but the voice can only be heard inbound, no outbound voice is heard at the remote end. When Router B calls Router A, the calls are perfect in both directions. In addition both sites can communicate with 3 other VoIP enabled sites without any problems, they just can communicate with each other (in one direction). Router A has an E1 and uses ISDN QSIG Router B has a T1 and uses E&M signalling. Any light on this very strange problem would be much appreciated

Both routers are running IOS 12.1(5)T10

1 REPLY
Anonymous
N/A

Re: One way voice transmission issues

Sounds like the answer supervision is not sent back to A correctly. Check on that.

Also you can try putting the following command in:

voice rtp send-recv

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