From: Treuz <[EMAIL PROTECTED]>

   hello all,
   for first sorry for my english.
   I have an issue with SIP "mid-call mobility" scenario. I'm using Asterisk
   (that act as sip server) and 2 softphone clients, all in the same
   subnetwork.
   I make a call from softphone A to B and in the middle of the call the client
   B moves to another subnetwork. The client B then obtain a new IP address via
   DHCP in the new subnetwork and take back the call with client A.
   The problem is that i got no SIP signaling nor any new INVITE message (as
   stated in this document:
   http://www.cs.columbia.edu/~hgs/papers/Wedl9908_Mobility.pdf in section 3.2)
   from client B to inform A about it's new IP address, but the RTP flow is
   directed to the correct host so the call can continue.
   In addition, after B moves and A hangup the call, the "BYE" message is
   directed to the old IP address of  B. I tried several softphone client, but
   no luck to see that new INVITE message. How is possible that A sends RTP
   correctly to new-B if he don't know yet the new IP address?
   Don't know where is the problem

Have you traced the SIP messages between A and Asterisk, and between
Asterisk and B?  Asterisk functions as a B2BUA, and all the signaling
passes through it.  So if the signalling is not working, it is likely
that Asterisk is involved.

Dale
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