From: boite-a-spam@plouf.fr.eu.org   
      
   Hello,   
      
   glen herrmannsfeldt a écrit :   
   >   
   > I don't know either SIP or RTP in that much detail. Normally UDP runs   
   > with a checksum. Most often, it runs over a hardware layer that supports   
   > a CRC on the packet.   
      
   The optional UDP checksum only covers the UDP pseudo-header, not the   
   data payload.   
      
   > Well, it is usual for a router to update the checksum when changing   
   > the TTL on the packer instead of recomputing it. Maybe not always,   
   > though.   
      
   The UDP pseudo-header does not include the TTL, so routers do not need   
   to recompute the UDP checksum when forwarding a packet. They only   
   recompute the IP header checksum.   
      
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