[SR-Users] Usleep on Reply

[Nicolas Breuer]

Hello Alex,

Thanks for your interesting reply.

I think it will not match because I want to send a "180" in case I receive a 183 without SDP  and no 180 from the carrier.

     if(t_check_status("180")) {
        if(isflagset(FL_183_RECEIVED)) { 
           ## 180 received OK
	xlog("[$ci] 180 received after 183! The horror!\n");
           ...
        } else {

	# No 180 received , so will send one :)

   Send_reply(180, Ringing)

	}

That will not work :)

I tried to delay the processing of the "183"  and :

If a 180 is received before the delay expires , I forward the "180"
If no 180 is received, I can send a 180 manually

 But again in my test, during the "delay" all incoming requests related to this dialog are delayed also


-----Message d'origine-----
De : sr-users [mailto:sr-users-bounces at lists.kamailio.org] De la part de Alex Balashov
Envoyé : lundi 31 juillet 2017 23:23
À : Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Objet : Re: [SR-Users] Usleep on Reply
Importance : Haute

Hi Nicolas,

The sleep functions block an entire SIP worker thread, of which there is a small number. While it's blocked, new incoming SIP messages will be picked up by other SIP workers. You can read more about how this works here (shameless plug, it's my article):

http://blog.csrpswitch.com/tuning-kamailio-for-high-throughput-and-performance/

In general, most ideas that rely on these functions are bad ones for the reasons explained in the article. 

If you want to check whether replies were received in a particular order, just use flags, which are transaction-persistent, in an onreply_route. That is, you can do something like:

  #!define FL_183_RECEIVED 1

  onreply_route[REPLY] {
     if(t_check_status("183")) 
        setflag(FL_183_RECEIVED);

     if(t_check_status("180")) {
        if(isflagset(FL_183_RECEIVED)) { 
           xlog("[$ci] 180 received after 183! The horror!\n");
           ...
        } 
     }

These flags can be accessed from any route that is called in connection with the given transaction.

You can also used AVPs or XAVPs if you need to keep some more sophisticated state associated with these messages, of course.

-- Alex 

--
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

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