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PAP2T incoming call 1st call audio path fail, 2nd works - IOS NAT

I have PAP2T with Viatalk service.

Everything else works fine.

First call make my phone rings. Whe answered I can not hear anything (both ways). Call get disconnected after 20sec.

I place second call imidiately. Audio path is established this time.

When I use X-lite instead of PAP2T everything works fine.

When I connect PAP2T directly to my cable modem it does work on the first call.

Played with parameter includung stun server. Did not have much luck.

I tried configur static translation of port 5060 and did not see any difference.

My router is Cisco 806 but I tried Cisco 2811 - the same result.

Does anyone have something like that?

Am I missing something?

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