agreed. the design of the db and queries are all properly tested, with only milliseconds of query time even for tables as large as millions of rows. i wanted to implement this only for insurance and was wondering if it's doable, theoretically speaking.
the timer module is promising although lacks dynamic assignment of timeouts. what i have in mind is: - do a timer_enable() after receiving an INVITE. - on timeout, go to rourte[timeout], statelessly send a cancel to callee(if applicable) and 408 to caller. - OR upon getting a 200 OK from the callee's leg, disable the timer. - do you think this is worthy of a feature request? something like timer_enable(timer_id, enable_disable, timeout) Kelvin Chua On Thu, Jan 2, 2014 at 2:46 PM, Alex Balashov <abalas...@evaristesys.com>wrote: > On 01/02/2014 01:39 AM, Kelvin Chua wrote: > > those timers are for INVITES sent by kamailio right? starting from >> t_relay() of the INVITE >> what i am looking for is, when i receive an INVITE, i start counting. >> > > TM's timers - and anything else TM does - are reliant on a transaction > existing. A transaction is not created until t_relay() is called. > > > the reason behind is, with all the functions involving several >> sql_xquery() involved to find out where to send the t_relay(), >> there will be unforeseen delays which might cause a very high PDD for my >> callers, i don't want them to wait. >> > > Even if you had such a timer fire, your database query would still block > the SIP worker thread that's handling the request route. > > If you have database calls that could get hung for several hundred > milliseconds, or even worse, several seconds, the solution to this problem > is to fix your architecture and your database calls. Bluntly speaking, > you're doing it wrong. No database calls or other external calls upon which > Kamailio relies for call processing should be taking long enough to execute > that PDD concerns are warranted, or that you should need timers to deal > with them. > > -- Alex > > > -- > Alex Balashov - Principal > Evariste Systems LLC > 235 E Ponce de Leon Ave > Suite 106 > Decatur, GA 30030 > United States > Tel: +1-678-954-0670 > Web: http://www.evaristesys.com/, http://www.alexbalashov.com/ > > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > sr-users@lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users >
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