Hi,
my problem is about a scenario where A calls B using "application
server/B2BUA" P1.
A -> Invite B -> P1 -> Invite [EMAIL PROTECTED], Expires=25 -> B
- P1 only want this call to be ringing for 25 seconds without final response
so it includes a Expires header with value 25 in the outgoing invite to B
- B is not powered so nothing will answer any provisional or final response
to the invite
- Invite is retransmitted several times
25 seconds after sending the first Invite to B, P1 will consider the call as
"ring timeout" and will send a 408 to A. On the B side however, how should
it do? Timer B has not fired yet on this side, and when reading the client
invite transaction state in RFC3261 17.1.1.3 it looks to me as P1 needs to
continue to retransmit the Invite to B until Timer B fires, to get to
Terminated state. Is this correct? Or is it ok for P1 to stop the retransmit
since it has taken down A side of the call there is no point of continue to
retransmit (it will be bad if B now answers the reinivte that was sent after
Expires timer has triggered on P1)
Basicly, what to do when Expires timer triggers before Timer B? If the case
was that P1 have got 100 trying from B, P1 would just have sent a Cancl but
that is not allowed now when there has been no response at all
Appreciate any help on this
Regards,
// Andreas
_______________________________________________
Sip-implementors mailing list
[email protected]
https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
