From: mark_cruzNOTFORSPAM@hotmail.com   
      
   "glen herrmannsfeldt"  wrote in message   
   news:kiva2p$2i9$1@speranza.aioe.org...   
   [skip]   
   > If you are configuring a SIP server, you can select (almost)   
   > any port you want.   
   >   
   >> I would appreciate if anyone could help me with this. Thanks !   
   >   
   > I believe both SIP and RTP run over UDP, which tends to be much   
   > more flexible with its ports.   
   >   
   > A TCP connection is identified by the quad: source address, source   
   > port, destination address, destination port. If replies come back   
   > with one of those changed, it won't be recognized. Consider what   
   > happens when two people make telnet (or any TCP protocol) connections   
   > from the same host to the same server.   
   >   
      
   Thanks for feedback!   
   What are the mechanisms to validate the UDP payload in case of SIP? SIP   
   message doesn't contain size of header or the body, so how to verify that   
   the payload is valid? In contrast, RTP indicates the size, so given the   
   length value from UDP header it is possible to check RTP for validit and   
   integrity. Can something similar be done for SIP?   
      
   Thanks.   
      
   Mark   
      
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