Hi Michael & Co,

Now with traces attached...

The customer is 86.166.113.42, FreeSWITCH is 85.133.61.23x & the Carrier is 125.236.36.3

Basically the carrier sends us a 180 without SDP (FreeSWITCH-Carrier Trace.pcap, packet 3...) which we transit back to the customer (Customer-FreeSWITCH Trace.pcap, packet 7).

Is there a away we can modify our response upon receipt of the 180 without SDP to send a 180/183 with SDP?

P.S. I made a couple of quick test calls to replicate this & I think I may have sent the customer leg of one & the carrier leg of the other (duh, sorry, only noticed this when I merged the traces together & the packets appears out of sequence). But the nos & principles involved are the same, hence the two files...

Any help much appreciated.

Rgds, Mick

 
From: Michael Collins <msc@freeswitch.org>
To: FreeSWITCH Users Help <freeswitch-users@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@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

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

FreeSWITCH-powered IP PBX: The CudaTel Communication Server
http://www.cudatel.com

Official FreeSWITCH Sites
http://www.freeswitch.org
http://wiki.freeswitch.org
http://www.cluecon.com

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