[Freeswitch-users] Generate 180/183 with SDP upon receipt of a 180 without SDP

Tue Oct 9 21:22:51 MSD 2012

Mick, Think about what you are asking. FS or any sip entity has no message it can send durring an invite transaction, untill the 200 where it could specify the SDP. Also at the point of the SS7 switch, receiving an ACM, there could only be one way audio.   

The direction of the audio at this point, before the call is answered, CAN only be the backchannel. Is there a way to map back-channel-indecator values to sip responses in your switch?  

--Dave
      _____  

  From: Mick Stevens [mailto:mickstevens at yahoo.com]
To: FreeSWITCH Users Help [mailto:freeswitch-users at lists.freeswitch.org], Michael Collins [mailto:msc at freeswitch.org], Seven Du [mailto:dujinfang at gmail.com]
Sent: Tue, 09 Oct 2012 05:36:07 -0700
Subject: Re: [Freeswitch-users] Generate 180/183 with SDP upon receipt of a 180 without SDP

Hi Michael,  

Wow, honoured & a bit starstruck by your reply in person (or do you celebs have somebody that replies for you ?)! Your FS books pretty much travel everywhere with me at the moment!  

Ok, but seriously, please excuse the poor but hopefully amusing/just about understandable call flow diagram attached. Basically in the 4th leg of the call (far right) an ACM is sent back to a Veraz switch (call leg 3) which sends us a 180 without SDP which we (FreeSWITCH, call leg 2) transit to the customer (1st call leg) without manipulation. The customer is apparently unable to generate ringing locally. So basically the question is can FS map/convert the 180 without SDP received into a 180/183 WITH SDP for onward transmission.  

Am trying to get a trace but unfortunately customer is not sending us traffic at the moment due to this "issue".  

Once again, excuse lack of wordsmithing/Visio/Powerpoint but travelling without my normal array of bells & whistles!  

<3 FreeSWITCH!   

Rgds, Mick  
T. +44 20 7001 6869  
E. mickstevens at yahoo.com  
www.twitter.com/mickstevens  

Sent En Route...   

    _____  

  From: Michael Collins <msc at freeswitch.org>
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org> 
Sent: Monday, 8 October 2012, 21:32
Subject: Re: [Freeswitch-users] Generate 180/183 with SDP upon receipt of a 180 without SDP

Hi Mick,

What is the call flow in this case? I'm curious to know what call legs exist and where the 180/183 is and is not happening. FreeSWITCH generally does all this for you, so I suspect there's a gremlin in the works. Can you pastebin a console debug log w/ SIP trace? That may give the gang here just enough information to figure out what's going on.

Thanks,
MC

On Mon, Oct 8, 2012 at 2:26 AM, Mick Stevens <mickstevens at yahoo.com> wrote:

Hi Folks,  

Does anybody know a way I can get FreeSWITCH to generate a 180 or 183 with SDP upon receipt of a 180 without SDP?  

Unless I'm being stupid (quite possible) I couldn't find an answer to this on the wiki, although lots around early media (I don't really want to resort to generating ringing for every call, in case the callee is genuinely engaged/busy for example).  

The context behind my enquiry is that I send traffic to another SIP carrier that then hands the traffic off at ISUP. Where the ISUP carrier sends back an ACM with a backward call indicator of "subscriber free" the carrier sends a 180 without SDP to me/FreeSWITCH assuming that any ringback tones will be generated by the SIP user agent (RFC 3398 blah, blah, blah).  

Any help much appreciated!  

Rgds, Mick  
Tel/SMS. +44(0)7967 594432
Fax. +44(0)7053 452429

Email/IM. mickstevens at yahoo.com
Skype: mick_stevens
www.facebook.com/mickstevens
www.twitter.com/mickstevens

_________________________________________________________________________
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-- 
Michael S Collins
Twitter: @mercutioviz
http://www.FreeSWITCH.org
http://www.ClueCon.com
http://www.OSTAG.org

_________________________________________________________________________
Professional FreeSWITCH Consulting Services:
consulting at freeswitch.org
http://www.freeswitchsolutions.com

Official FreeSWITCH Sites
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http://wiki.freeswitch.org
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