I have a pix 506 at my headquarters and a h323 compliant ip phone at my remote site. I currently have no problem receiving and making ip based calls from the remote site's phone. However the problem that I'm running into is the translation slot timeouts. Once the call is terminated my tcp connection translation port 1720 is cleared. However since h323 uses dynamic ports my udp translation sessions hang out there and I can not make or receive any calls until the translation slots clear. I have a static nat for my VoIP gateway device and I have the follwing timeouts in the pix config:
If I manually "clear xlate" I can receive and make calls immediately. If I allow the timeouts to process it takes on average 5 minutes to clear the translations. I know h323 minimum timeout value is five minutes but my udp timeouts are set for 2 minutes and they do not clear the translation slot. Is there anything I can do to clear these translations faster ?
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