Hi,

 

   To answer your question we are using SIP-T not SIP-I, and i received some 
information that SIP-T does not support call transfer.

Is that accurate?  

 

Thanks,
 


Date: Fri, 30 Oct 2009 23:36:49 -0400
Subject: Re: [Sip-implementors] An important query regarding SIP callTransfer
From: raj.khul...@gmail.com
To: shar...@techmahindra.com
CC: r_vergh...@hotmail.com; sip-implementors@lists.cs.columbia.edu

Hi, 

415 refers to MIME types, not codecs, despite the implication of the word 
"media", see RFC 3261 
21.4.13 415 Unsupported Media Type

   The server is refusing to service the request because the message

   body of the request is in a format not supported by the server for
   the requested method.  The server MUST return a list of acceptable
   formats using the Accept, Accept-Encoding, or Accept-Language header

   field, depending on the specific problem with the content.  UAC
   processing of this response is described in Section 8.1.3.5.

You probably have some kind of MIME type in your SIP INFO message, which the 
proxy is choking on. Are you running SIP-T/SIP-I? What exactly are you sending 
in order to implement the transfer?


Raj



On Tue, Oct 20, 2009 at 7:13 AM, Sharanabasavaraj Mathapati 
<shar...@techmahindra.com> wrote:





> Hey,

> I receive the below message when I transfer an established call
> Below is call scenario

> A) Softswitch A to Softswitch B via Sip and then to an International          
> > destination VIA TDM.
> B) Established B Party is then Transferred to C Party, Ring Back tone 
> received but when transferred below message is received


> SIP/2.0 415 Unsupported Media Type
> Via: SIP/2.0/UDP 10.32.0.20:5060;branch=z9hG4bKf8e3ce8d
> To:  <sip:+919820349...@10.0.10.20;user=phone>;tag=98ff6e06
> From:"024370309" <sip:024370...@esdcs.com;user=phone>;tag=0f46440d
> Call-ID: 1ea9a45ac3c9baa...@10.32.0.20
> CSeq: 2 INFO
> Server: SSW/0.0.0
> Max-Forwards: 70
> Content-Length:  0

> What needs to be done to enable this kind of call transfer, thanks for your 
> inputs.

> Thanks,

> Rajeev

I guess B is offering a codec which C is not supporting.

-Sharan


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