[SIPForum-discussion] specific case with a=inactive

[badal naik]

Hello Joerg,
I am not sure whether this will be helpful to you.But
take it as a suggestion.
As i Know call hold is implemented in two ways.
1. Send a re-Invite with "0.0.0.0" as the IP address
in the sdp data.(RFC 2543)
2.Send a re-Invite with the parameter a=sendonly set
in the sdp data.(RFC 3264 )

You have tried the first one.Can u check the
authenticity of the second one.

In the first case the recepient cant send RTCP to
you.I think most advanced server uses RFC 3264 for
call Hold.That may be the case that ur server expects
this RFC and you are following the obsolete one.

Try with second one.I think it may work..
But please let me know if things work out.

Thanks
Badal Naik



--- Joerg Scholz <j.scholz at teles.de> wrote:

> Thanks Badel and Robert 
> for your responds. That's also what I expected to do
> - but it seems to be a
> problem for that class 5 SIP server solution which I
> try to work with.
> It uses the Re-invite without SDP to retrieve the
> hold call. Thereby the
> retrieve is initiated with a user agent web
> application (not the phone). If
> I send still:
> A=inactive
> In the SDP of the 200ok response of my device; it is
> used for the second leg
> of the call as SDP content and the call will be
> reestablished without voice.
> 
> So I need exactly to know what the right behavior is
> in that case.
> 
> It is quite simple to change the behavior but I'm
> pretty sure that other
> cases will have problem then.
> Thanks again and best regards
> Joerg
> 
> 
> -----Original Message-----
> From: badal naik [mailto:kunusan at yahoo.com] 
> Sent: Tuesday, October 02, 2007 10:41 AM
> To: Traussnig Robert; Joerg Scholz;
> discussion at sipforum.org
> Subject: Re: [SIPForum-discussion] specific case
> with a=inactive
> 
> Well,
> I think in your scenario U have to add the SDP
> parameter of the previous success(2**) reponse.
> Re-Invite should work as follows in ur case:
> When a UAC sends a re-invite with no session
> description, in which case the first reliable
> non-failure response to the re-invite will contain
> the
> offer.
> 
> That is my understanding..
> 
> Thanks
> Badal Naik
> --- Traussnig Robert <robert.traussnig at kapsch.net>
> wrote:
> 
> > Hi!
> >  
> > I'm not quite sure if this is correct but because
> of
> > the fact that you
> > didn't get a SDP in the Re-Invite you have to give
> > an offer in your
> > 200ok. So you have to decide if you send
> a=inactive
> > again or a=sendrecv.
> > Maybe someone have a better answer.
> >  
> > Best Regards,
> > Robert
> >  
> > 
> > -----Ursprungliche Nachricht-----
> > Von: discussion-bounces at sipforum.org
> > [mailto:discussion-bounces at sipforum.org]Im Auftrag
> > von Joerg Scholz
> > Gesendet: Montag, 01. Oktober 2007 18:58
> > An: discussion at sipforum.org
> > Betreff: [SIPForum-discussion] specific case with
> > a=inactive
> > 
> > 
> > 
> > Hello everybody,
> > 
> > I have a quick question related to the SDP
> signaling
> > behavior in a
> > specific hold case. My scenario is the following:
> > 
> >  
> > 
> > Incoming Re-invite of an established voice call
> with
> > the following
> > content of SDP:
> > 
> >             c=IN IP4 0.0.0.0
> > 
> >             ...
> > 
> >             a=inactive
> > 
> >  
> > 
> > In the 200ok I confirm the attribute line:
> > 
> >             a=inactive
> > 
> >  
> > 
> > and the call is hold - everything ok. 
> > 
> > Later on comes another Re-invite without SDP for
> the
> > same call. Now my
> > question, if I answer in the 200ok for that
> > Re-invite with SDP do I have
> > to repeat also the: 
> > 
> >             a=inactive
> > 
> > attribute or do I send now my SDP again with 
> > 
> >             a=sendrecv
> > 
> >  
> > 
> > Thanks and Best regards
> > 
> > Joerg
> > 
> >  
> > 
> > > _______________________________________________
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> > 
> 
> 
> 
>        
>
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