[SR-Users] Detect 200 OK for ReINVITE

[Grant Bagdasarian]

Hi,

Is it possible in Kamailio, or SIP in general, to detect if a 200 OK is for a 
ReINVITE?

Regards,

Grant
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Re: [SR-Users] Detect 200 OK for ReINVITE

[Alex Balashov]

Don't know about detect, but you could set a transaction-persistent flag or AVP 
when processing the reinvite request. This will also be testable in the 
onreply_route. 

-- Alex

--
Principal, Evariste Systems LLC (www.evaristesys.com)

Sent from my Google Nexus.


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Re: [SR-Users] Detect 200 OK for ReINVITE

[Grant Bagdasarian]

Hi Alex,

Here a sample config (not yet tested).
Does this make sense and will this work?

route[WITHINDLG] {

if (!has_totag()) {
return;
}

# Sequential request within a dialog should take the path determined by 
record-routing
if (loose_route()) {
if(is_method("BYE")) {
route(ON_LOG_BYE);
}

if(is_method("INVITE")) {
$avp(i:is_reinvite) = 1;
}

}

}

onreply_route[MANAGE_REPLY] {

if(!t_check_trans()) {
exit;
}

if($avp(i:is_reinvite)) {
exit;
}

}

-Original Message-
From: sr-users [mailto:sr-users-boun...@lists.sip-router.org] On Behalf Of Alex 
Balashov
Sent: Tuesday, July 12, 2016 3:21 PM
To: Kamailio (SER) - Users Mailing List 
Subject: Re: [SR-Users] Detect 200 OK for ReINVITE

Don't know about detect, but you could set a transaction-persistent flag or AVP 
when processing the reinvite request. This will also be testable in the 
onreply_route. 

-- Alex

--
Principal, Evariste Systems LLC (www.evaristesys.com)

Sent from my Google Nexus.


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Re: [SR-Users] Detect 200 OK for ReINVITE

[Olle E. Johansson]

> On 12 Jul 2016, at 15:18, Grant Bagdasarian  wrote:
> 
> Hi,
>  
> Is it possible in Kamailio, or SIP in general, to detect if a 200 OK is for a 
> ReINVITE?
>  
Not from the 200 OK, but the matching INVITE you can check if there’s a to-tag 
in Kamailio and SIP.

In Kamailio, if you are stateful, you can use the TMX module pseudovariables to 
check the request
matching the response and check if there’s a to-tag. Check the cookbook for 
$T_req(pv)

http://www.kamailio.org/wiki/cookbooks/4.4.x/pseudovariables

/O___
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Re: [SR-Users] Detect 200 OK for ReINVITE

[Grant Bagdasarian]

Hi Olle,

Yes, I knew that :D.
I went with the method Alex suggested.

In route[WITHINDLG] inside the loose_route block:
   if(is_method("INVITE")) {
   $avp(s:is_reinvite) = "1";
   }

In onreply_route

if($avp(s:is_reinvite) == "1") {
   xlog("L_INFO", 
"[R-ONREPLY-ROUTE-MANAGE-REPLY:$ci] !>" "Received $rs for ReINVITE $rr \r\n");
   exit;
}

I’ve tested it, and it worked.

From: sr-users [mailto:sr-users-boun...@lists.sip-router.org] On Behalf Of Olle 
E. Johansson
Sent: Tuesday, July 12, 2016 3:56 PM
To: Kamailio (SER) - Users Mailing List 
Subject: Re: [SR-Users] Detect 200 OK for ReINVITE


On 12 Jul 2016, at 15:18, Grant Bagdasarian mailto:g...@cm.nl>> 
wrote:

Hi,

Is it possible in Kamailio, or SIP in general, to detect if a 200 OK is for a 
ReINVITE?

Not from the 200 OK, but the matching INVITE you can check if there’s a to-tag 
in Kamailio and SIP.

In Kamailio, if you are stateful, you can use the TMX module pseudovariables to 
check the request
matching the response and check if there’s a to-tag. Check the cookbook for
$T_req(pv)
http://www.kamailio.org/wiki/cookbooks/4.4.x/pseudovariables

/O
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Re: [SR-Users] Detect 200 OK for ReINVITE

[Daniel-Constantin Mierla]

To add my 2c, if the performance is a **really big** concern, the
solution with transaction flags as mentioned by Alex is one of the best.

In request route test for to-tag and then setflag(x). Then in
onreply_route[...] or failure_route[...] test if isflagset(x).

The other suggestions are also very fast, but not as fast as with
transaction flags.

On the other hand -- some details about avp names -- i: for avp names is
saying that the name has to be treated as integer id, which is not the
case for your example with:

$avp(i:is_reinvite) = 1;

After i: must be a number up to 2^16. Or just remove the i: and let it
be string name.

Cheers,
Daniel


On 12/07/16 15:55, Olle E. Johansson wrote:
>
>> On 12 Jul 2016, at 15:18, Grant Bagdasarian > > wrote:
>>
>> Hi,
>>  
>> Is it possible in Kamailio, or SIP in general, to detect if a 200 OK
>> is for a ReINVITE?
>>  
> Not from the 200 OK, but the matching INVITE you can check if there’s
> a to-tag in Kamailio and SIP.
>
> In Kamailio, if you are stateful, you can use the TMX module
> pseudovariables to check the request
> matching the response and check if there’s a to-tag. Check the
> cookbook for 
>
>
>   $T_req(pv)
>
> http://www.kamailio.org/wiki/cookbooks/4.4.x/pseudovariables
>
> /O
>
>
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-- 
Daniel-Constantin Mierla
http://www.asipto.com - http://www.kamailio.org
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda

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