Isn't this what late offers are meant to accomplish?

   Empty (no SDP) INVITE -->
   <-- 200 OK with SDP offer
   end-to-end ACK with SDP answer -->

-- Alex

On Sat, Dec 14, 2019 at 11:31:50PM -0600, Ranjit Avasarala wrote:

> Hi
> I have a scenario where the terminating device responds with SIP 488 Not
> Acceptable here response.  It is understood that the terminating device
> does not support any of the codecs that the incoming INVITE has.
> 
> this issue occurred when a landline called VoLTE device and the
> intermediate MSC/MGCF translated the SS7 message to SIP INVITE and put the
> codecs it supports.  So since the terminating device does not support any
> of the listed codecs in SIP INVITE SDP offer, it responded with 488 response
> 
> So my query is - is there a way the terminating device could indicate the
> list of codecs it supports in 488 response?
> 
> Thanks
> Ranjit
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-- 
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) 
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
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