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h.323 gateway behind NAT

rasankalakmal
Level 1
Level 1

‎12-14-2007 06:10 AM

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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rasankalakmal
Level 1
Level 1

‎12-14-2007 06:14 AM

attachment

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dgahm
Level 8
Level 8

‎12-14-2007 09:59 AM

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

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801af2b9.shtml

http://www.cisco.com/en/US/products/ps6441/products_configuration_guide_chapter09186a00807819ce.html

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Dave

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