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

[Daniel-Constantin Mierla]

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://www.linkedin.com/in/miconda
Book: SIP Routing With Kamailio - http://www.asipto.com
http://miconda.eu

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