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Do SmartNodes have a built-in NAPT application level gateway for H.323?
Posted by Elena Brambilla, Last modified by Daniel Lizaola on 12 December 2017 04:24 PM

H.323 is a non-well behaving protocol in that it signals transport ports (RTP ports) inband in IP packets. When using NAPT (Network Address and Port Translation) this poses a problem since the ports are used by NAPT for address mapping. Thus H.323 does usually not pass a NAPT unless the NAPT is enhanced with H.323 aware functionality that leaves H.323 port ranges untouched.SmartNodes have NAPT but no H.323 aware application level gateway. However, it is possible to run NAPT and H.323 gateway concurrently on a SmartNode since NAPT affects only packets that are routed from IP interface to another (WAN to LAN).

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