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?
Thanks
Phil Lavin Systems Engineer CloudCall by SYNETY www.cloudcall.comhttp://www.cloudcall.com
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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
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://www.linkedin.com/in/miconda
Book: SIP Routing With Kamailio - http://www.asipto.com
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
-
Daniel-Constantin Mierla -
Phil Lavin