[OpenSIPS-Users] b2b refer scenario

[Anton Zagorskiy]

I'm trying to solve accounting + lines limit (numbers of incoming and
outgoing calls) + refer problem..
The problem seems as very hard to me.

Everything works well, but refer request. 

There are 3 (A, B, C) UAs, each has limititation of number of incoming and
outgoing calls.
1. A calls B. Now A takes 1 outgoing and 0 incoming lines. Lets write this
as (1;0). So, B takes (0;1)
2. B decides to make an attended refer to C. So, it calls C (sent INVITE).
Now B takes (1;1), C - (0;1)
3. After conversation with C, B finishs the refer and send REFER to A.

For a properly billing and lines limit I should have :
1. Lines limit: A(1;0), B(1;1), C(0;1)
2. Conversations between A,B and B,C (from billing points of view)

But after when A received REFER request, it 
1. sends an INVITE, not a RE-INVITE, because of REFER has 'reffered-to;
header and 'replaces' tag, so that INVITE doesn't have 'to-tag', so this is
a new session with new billing between A and C.
2. sends a BYE to B, so this finishes the session between A and B and
changes line limit: now B takes (0;1)

After when C received that INVITE, he sends a BYE to B.

And now B takes 0 incoming and 0 outgoing lines and accounting (billing)
doesn't work properly (there is just one leg between A and C)


I haven't any idea how to solve this situation.
B2B could help me by means of sending RE-INVITE to A and C when B sends
REFER, instead of transmitting REFER to A.



WBR, Anton Zagorskiy
VoIP Developer, Oyster Telecom
Phone.: +7 812 601-0666
Fax: +7 812 601-0593
a.zagorskiy at oyster-telecom.ru
www.oyster-telecom.ru



> -----Original Message-----
> From: users-bounces at lists.opensips.org [mailto:users-
> bounces at lists.opensips.org] On Behalf Of Anca Vamanu
> Sent: Tuesday, January 11, 2011 6:59 PM
> To: users at lists.opensips.org
> Subject: Re: [OpenSIPS-Users] b2b refer scenario
> 
> On 01/11/2011 04:56 PM, Anton Zagorskiy wrote:
> > Hi Anca.
> >
> > As I see from the b2b documentation, there is no easy way to catch an
> > attended refer and make it as INVITE.
> Why do you want to do that?
> 
> >   The problem is in the refer-to field
> > that contains "Replaces" tag.
> >
> >
> > May be anyone has an idea how to do this?
> >
> >
> >
> >
> > Also, why there isn't documnetation for 1.6.4 on the site? There are
> 1.6.3
> > and trunk/devel in Cookbooks and 1.6.x and 1.7.x in the tutorials.
> What is
> > 1.7.x?
> >
> >
> >
> >
> > WBR, Anton Zagorskiy
> > VoIP Developer, Oyster Telecom
> > Phone.: +7 812 601-0666
> > Fax: +7 812 601-0593
> > a.zagorskiy at oyster-telecom.ru
> > www.oyster-telecom.ru
> >
> >
> >
> >> -----Original Message-----
> >> From: users-bounces at lists.opensips.org [mailto:users-
> >> bounces at lists.opensips.org] On Behalf Of Anca Vamanu
> >> Sent: Wednesday, January 05, 2011 3:53 PM
> >> To: users at lists.opensips.org
> >> Subject: Re: [OpenSIPS-Users] b2b refer scenario
> >>
> >> Hi Anton,
> >>
> >> 01/05/2011 02:09 PM, a.zagorskiy at oyster-telecom.ru wrote:
> >>> Hi Anca,
> >>> thanks for your reply, but could you explain a bit more?
> >>>
> >>> I don't understand how B2B will understand that he should execute
> >>> scenario on REFER request when b2b_init_request is calling on an
> >>> INVITE request?
> >>>
> >>> I'm talking about situation, where there are 2 UAs, they has
> >>> established session, and one of them sending the REFER request to
> >>> another.
> >>>
> >> Yes, this is exactly how it works, by calling the b2b_init_request
> on
> >> the initial Invite, so that B2BUA is in the middle of the call and
> can
> >> control it. If you look in the xml scenario file you will see that
> >> there
> >> is a rule for REFER there - this is how it know that when a REFER is
> >> received it has to do what it has to do.
> >> Try this out  and you will see ;) .
> >>
> >> Regards,
> >>
> >> --
> >> Anca Vamanu
> >> www.voice-system.ro
> >>
> >>
> >> _______________________________________________
> >> Users mailing list
> >> Users at lists.opensips.org
> >> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
> >
> > _______________________________________________
> > Users mailing list
> > Users at lists.opensips.org
> > http://lists.opensips.org/cgi-bin/mailman/listinfo/users
> >
> 
> 
> --
> Anca Vamanu
> www.voice-system.ro
> 
> 
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