Re: [SR-Users] Example kamailio.cfg t_check_trans()

Welcome - enhancements to the docs are always more than welcome!

Cheers, Daniel

On 04/01/16 09:29, Phil Lavin wrote:

Thanks, Daniel. I’ll update the docs to clarify this, if I get a moment.

Cheers

Phil

*From:*sr-users [mailto:sr-users-bounces@lists.sip-router.org] *On Behalf Of *Daniel-Constantin Mierla *Sent:* 04 January 2016 08:06 *To:* Kamailio (SER) - Users Mailing List sr-users@lists.sip-router.org *Subject:* Re: [SR-Users] Example kamailio.cfg t_check_trans()

Hello,

On 31/12/15 12:39, Phil Lavin wrote:

Hi there,



The example config that Kamailio ships with contains this block of
code in request_route:



# handle retransmissions

if(t_precheck_trans()) {

     t_check_trans();

     exit;

}

t_check_trans();



I am not fully understanding the requirement for either of the
t_check_trans() here. As far as I can see from the documentation,
t_check_trans() returns a boolean value and does not modify any
data internally.



Can anyone help me find out what the relevance of the
t_check_trans() calls is?

t_check_trans() is used to detect retransmissions. If a retransmission is received, then the last reply (if any) needs to be sent back, then t_check_trans() does an 'exit' internally.

Cheers, Daniel

-- Daniel-Constantin Mierla http://twitter.com/#!/miconda http://twitter.com/#%21/miconda - http://www.linkedin.com/in/miconda Book: SIP Routing With Kamailio - http://www.asipto.com http://miconda.eu