2 Jan
2014
2 Jan
'14
8:46 a.m.
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/