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no audio because of nat

I am trying to set up my router and I have it at the point where I can call my phones but I get no audio. When I run my sniffer I see sip and register messages but I do not see any rtp from behind my router.  I am trying to send voice traffic to s0/1 and data to s0/0.  It looks like a nat issue but I can not put my finger on it.

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Cisco Employee

Re: no audio because of nat

What device is doing NTA?  I has to be aware of and perform the translations for RTP as learned from the signaling protocol.

For example, if a PIX were doing the NAT and the signaling was done via H323, the fixup protocol h323 command would enable this.

Hope this helps....

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