Hi All,
I was reading section 17.1.1.2 of RFC 3261 and I had some basic questions, so I
thought I will ask the experts.
1. What is the UAC supposed to do when it is in the Proceeding state and it
does not receive any final response? The text in section 17.1.1.2 does talk
about this case. Also when I look at the flow in Firgure 5, there seems to be
no timer attached to get out of the 'Proceeding' state. There is one attached
to 'Calling' (Timer B) and 'Completed' (Timer D) states, but none to
'Proceeding' state. So are we saying that once you get into Proceeding state
and the other end fails for some reason, the UAC is stuck.
Or is the figure inaccurate and it should really show a Timer B associated with
one of the arrows coming out of that state? In which case my questions would be
does a provisional response reset this timer? Otherwise an INVITE transaction
would be constrained to 32secs assuming a T1 of 500ms (i.e. a call should go
from 'Calling' to 'Completed' in 32secs!
Appreciate your responses.
Thank you.
- Ajay
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