h.323 gateway behind NAT

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Dec 14th, 2007
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i configued h.323 gateway (gateway is connected PSTN through FXO) behind internet NAT router and try to call that gateway from a softphone through internet. the dialed PSTN no is ringging but no voice for both ways. Pls refer the attached configuration. Is this a problem with NAT translation?

Thanks in advance!

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dgahm Fri, 12/14/2007 - 09:59
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Yes, you need a version of IOS that has NAT ALG. What IOS are you running?

NAT with ALG can translate the embedded addresses in H225/H245.

Cisco IOS NAT Application Layer Gateways



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