[SR-Users] ways to track all messages of a dialog

[Fabian Borot]

Thank you Daniel, I ended up using htables. It works fine .. I just want to see if there was a light weight and ready to use "flag" that would work for me.


-----Original Message-----
From: Daniel-Constantin Mierla [mailto:miconda at gmail.com] 
Sent: Thursday, March 8, 2018 3:17 AM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>; Fabian Borot <fborot at hotmail.com>
Subject: Re: [SR-Users] ways to track all messages of a dialog

Hello,

transaction flags are not the right solution here, because if you set the flag for INVITE, you don't get it set for requests within dialog like ACK, BYE, ...

You can use dialog flags -- see dialog module docs for the functions related to them. You have to call first dlg_manage() (might work also with is_known_dlg()) for these requests and then test the dialog flag.

Alternative, if you don't have dialog module loaded, then use htable to mark the dialog -- so store in htable keys with the call ids of the calls to be tracked. For first invite do:

$sht(x=>$ci) = 1;

And then test for the rest of requests:

if($sht(x=>$ci) == 1) { ... }

Cheers,
Daniel

On 14.02.18 15:12, Fabian Borot wrote:
> Thank you , but what I need is to be used inside the script, aside from logging the processing of the messages for those call I also need to apply certain logic in the kamailio script file, that is why I need something that can be used from there.  Sipcapture or sngrep are outside the scope of what I need.
>
> Can somebody confirm whether the flags are suitable for this case ?
>
>
> -----Original Message-----
> From: Fabian Borot
> Sent: Tuesday, February 13, 2018 5:06 PM
> To: 'sr-users at lists.kamailio.org' <sr-users at lists.kamailio.org>
> Subject: ways to track all messages of a dialog
>
> I need to track all messages (SIP Requests, SIP Responses) for some SIP dialogs. Let's say I need to log something specific on each state for calls initiated from a certain IP (initial request, temporary replies, rejection with a negative response, call was accepted with 200, termination with BYE, termination with CANCEL  etc. ).
> I am thinking on using flags but I am not sure after reading the tutorial  on flags (http://www.kamailio.org/dokuwiki/doku.php/tutorials:openser-flag-operations) if that is going to work properly. The doc says: "They provide a very easy and fast way of keeping states during processing a request or during a transaction". I am afraid that the ACK if the call is accepted and the BYE won't be tracked properly because they are not part of the initial transaction. Also the doc does not mention if the flag is preserved among branches spawned during the processing of the call.
>
> The idea is for example: 
>
> request_route {
> 	if (is_method("INVITE")){
> 		if ($si == "192.168.168.100"){  	#condition that would set the flag, INVITE came from "my_IP"
> 			#flag/mark dialog
> 			setflag(1);
> 			#log call from "my_IP" was received
> 		}
> 		route("INCOMING);
> 	}
> 	If(loose_route() ){
> 		if (is_method("ACK")){
> 			if(isflagset(1)){
> 				#log ACK related to "my_IP" was received
> 			}
> 		}
> 		if (is_method("CANCEL")){
> 			if(isflagset(1)){
> 				#log CANCEL related to "my_IP" was received
> 			}
> 		}
> 		if (is_method("BYE")){
> 			if(isflagset(1)){
> 				#log BYE related to "my_IP" was received
> 			}
> 		}
> 	}
> }
>
> Then :
>
> route["INCOMING"] {
> 	# do some processing
> 	# do some processing
> 	
> 	t_onreply("INCOMING");
> 	t_on_failure("INCOMING");	
> 	t_relay();
> }
>
> onreply_route[INCOMING] {
> 	#do some processing
> 	if(isflagset(1)){
> 		#log a reply related to "my_IP" was received
> 	}
> }
>
> failure_route[INCOMING] {
> 	#do some processing
> 	if(isflagset(1)){
> 		#log a negative reply related to "my_IP" was received
> 	}
> }
>
>
> Will the flags work on this case ?
>
> My 2nd approach is to use a htable and use the call_id for my calls as the key. The on each route section (reply, failure_reply, ACK processing etc.) find the $ci on the htable and if it is there do the appropriate action. But I need to delete the key:value once the call ends or leave it autoexpire with a expire value bigger than the max_call_duration_time that we have in our system.
>
>
>
>
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--
Daniel-Constantin Mierla
www.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio Advanced Training - April 16-18, 2018, Berlin - www.asipto.com Kamailio World Conference - May 14-16, 2018 - www.kamailioworld.com