Maeda Toshihiko wrote:
>
> Dear folks,
>
> I hope this is right alias to talk...
>
> In INVITE transaction, when a provisional response is sent from UAS, how
>
> long should UAC wait for?(i.e. time-out)
Its not specified. The client can wait as long or as short as it likes.
Asking "how long to wait" is the same as asking how long does a caller
let the phone right? Well, the caller decides. Note, however, that
proxies are not obligated to maintain transaction state for longer than
3 minutes, so after 3 minutes, you are likely to get a 487 as a result
of a proxy giving up and cancelling.
> Just I understand; If waiting for a provisional response, UAC should
> retransmit the INVITE message with 'exponential backoff'. However, in
> that
> case, we should consider the case that the called party is just 'rung'.
You should not be waiting for a provisional response. A proxy or UAS
will generate a provisional response immediately if it can't generate a
final response right away. If you never get a provisional response or a
final response, this is a failure case.
-Jonathan R.
--
Jonathan D. Rosenberg, Ph.D. 72 Eagle Rock Avenue
Chief Scientist First Floor
dynamicsoft East Hanover, NJ 07936
[EMAIL PROTECTED] FAX: (973) 952-5050
http://www.jdrosen.net PH: (973) 952-5000
http://www.dynamicsoft.com
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