[OpenSIPS-Users] Provisional response handling in case of forking

[Ramachandran, Agalya (Contractor)]

Hi Bogdan,

Thanks for your kind response. Am clear now.

Regards,
Agalya

From: Bogdan-Andrei Iancu [mailto:bogdan at opensips.org]
Sent: Monday, June 13, 2016 4:59 PM
To: Ramachandran, Agalya (Contractor) <Agalya_Ramachandran at comcast.com>; OpenSIPS users mailling list <users at lists.opensips.org>
Subject: Re: [OpenSIPS-Users] Provisional response handling in case of forking

Hi Agalya,

For the first 180, the flag is not set (by default, the flags are off), so no drop will be done and the execution will get to the setflag(), setting the flag. (only the drop is under the IF).

Regards,


Bogdan-Andrei Iancu

OpenSIPS Founder and Developer

http://www.opensips-solutions.com
On 13.06.2016 22:48, Ramachandran, Agalya (Contractor) wrote:
Hi Bogdan,

OK. Got it. One more to question to understand the snippet you gave..
I have just commented my understanding of each snippet at the same line.
I don't get why we need setflag(FLAG_180); after we drop the response.

if ($rs==180) { //We are checking response is equal to 180
    if (isflagset(FLAG_180)) // Checking the flag is set or not. If response is 180, flag will be set
        drop();             //If set we are dropping the consecutive same response.
    setflag(FALG_180); ??
}


(P.S) I tested without setting the flag after drop response. In this case it forwards both 180 response back to caller.
Am curious how it controls it.

Is onreply_avp_mode controls dropping the 2nd response or setflag(FLAG_180);?

I want to be clear on what am working with. Hence posting you this question.


Regards,
Agalya

From: Bogdan-Andrei Iancu [mailto:bogdan at opensips.org]
Sent: Monday, June 13, 2016 12:13 PM
To: Ramachandran, Agalya (Contractor) <Agalya_Ramachandran at comcast.com><mailto:Agalya_Ramachandran at comcast.com>; OpenSIPS users mailling list <users at lists.opensips.org><mailto:users at lists.opensips.org>
Subject: Re: [OpenSIPS-Users] Provisional response handling in case of forking

Hi Agalya,

It is not a predefine flag. And you do not have to define the flags in OpenSIPS. Just pickup a name and start using it in script.

Regards,



Bogdan-Andrei Iancu

OpenSIPS Founder and Developer

http://www.opensips-solutions.com
On 13.06.2016 17:27, Ramachandran, Agalya (Contractor) wrote:
Hi Bogdan,

Thank you for your kind response. I will try the logic you told me. But I have a question in the below logic.
"FLAG_180", is this something declared and maintained by opensips and set by default on its own if Ringing response is received or we need to define this flag explicitly ?

E.g for setting NAT flag, we are using 'usrloc' module and 'nat_bflag' as parameter and then value.
modparam("usrloc", "nat_bflag", "NAT")

Likewise if we need to define explicitly, what is the module in which we need to define the flag for FLAG_180?

Regards,
Agalya
From: Bogdan-Andrei Iancu [mailto:bogdan at opensips.org]
Sent: Monday, June 13, 2016 6:31 AM
To: OpenSIPS users mailling list <users at lists.opensips.org><mailto:users at lists.opensips.org>; Ramachandran, Agalya (Contractor) <Agalya_Ramachandran at comcast.com><mailto:Agalya_Ramachandran at comcast.com>
Subject: Re: [OpenSIPS-Users] Provisional response handling in case of forking

Hi Agalya,

Use the onreply route (be sure to onreply_avp_mode to be set to 1 - see http://www.opensips.org/html/docs/modules/2.2.x/tm.html#id294290) in combination with flags, to record when the an 180 reply was set.

Like:

if ($rs==180) {
    if (isflagset(FLAG_180))
        drop();
    setflag(FALG_180);
}

The onreply_avp_mode 1 will ensure that the onreply route will not overlap for 2 replies .

Regards,




Bogdan-Andrei Iancu

OpenSIPS Founder and Developer

http://www.opensips-solutions.com
On 10.06.2016 23:07, Ramachandran, Agalya (Contractor) wrote:
Hi team,

We are using opensips for our project and we are currently using opensips as proxy.
Am forking the incoming sip call, to two destinations. It Rings in both Dest A and Dest B, as a result I get two 180 Ringing response from A and B.
I want to filter only the first incoming 180 Ringing response and send to the actual caller. Is there a way to do this in opensips config file?

I have seen drop() function which drops the complete provisional response. But in my case I have to forward one 180 Ringing to the caller.
Can it be achieved by the changes in config file? Please guide me.

Regards,
Agalya







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