Hello, I have noticed that some SIP User Agents are sending UDP keep-alive packets in order to keep the pinhole on the NAT from closing.
But because of the fact that most of these NATs are either port restricted cone or, in the worst case, symmetric, it means you need to send the packets to their intended destination (including the port number). So, I worry about these packets because I think that maybe the implementation of the receiving side might not account for packets which are essentially "garbage" (for instance, a phone might interpret this as a lost packet and do silence suppression, or a video codec may try to conceal packet loss etc).. Therefore I am wondering if any standards (or even best practices) exist for the sending of such packets. Dave -- David Stuart, SIPquest Email: dave (at) sipquest (dot) com Phone: 254-8886 x234 Web: http://www.sipquest.com/ Address: 300 - 350 Terry Fox Drive, Kanata Ontario, K2K 2P5 _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
