Hi Isaac,

I think the implemention should know who is answering of which INVITE. In my 
optionen you can recognizing it through the branch-id. After receiving a 200 OK 
for the INVITE you have to create a route set and all message will be send to 
this IP. So you ACK should go to the right UAS.

Greeting

Markus


"Isaac Dudy" <[EMAIL PROTECTED]> schrieb am 16.06.05 08:11:01:
> 
> Hi all.
> 
> Suppose UA sends INVITE to FQDN which is resolved to 2 different IP
> addresses.
> The UA tries the first IP, but there is no response since the server is
> down so the UA tries the second IP and succeeds (the UA got 2xx
> response).
> Now the UA has to send ACK but it MUST do resolving again. 
> The resolving gives the same 2 addresses again with the same order so
> the UA will try the first address first (which will not get the ACK
> because the server is down). Eventually, the call will not be
> established since the second server who keep sending the 2xx will not
> get the ACK and send BYE.
> 
> Please advise ...
> 
> Thanks in advance,
> David Isaac.
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> [email protected]
> http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors


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