Playing RBT on receipt of 181 (Call is being forwarded) or 182 (Call Queued) does not seems a good choice since 181/182 does not give any indication whether call has been placed to called party and called party is ringing. I would prefer playing Routing Tone or some sort of local announcement. RBT should be played only when called device is ringing. I believe that gateway should get 180 Ringing (after 181 Call is being forwarded) when called mobile phone starts ringing and RINGING message is received from GSM network. Once this occurs, then only RBT should be played.
Best Regards, Vivek Batra -----Original Message----- From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Sunita Bhagwat Sent: Tuesday, March 02, 2010 4:49 PM To: sip-implementors@lists.cs.columbia.edu Cc: Sunita Bhagwat Subject: [Sip-implementors] Ringback on SIP 181 Call forward / 182 Queued Hi all, I'd like to know if a SIP gateway receiving a 181 (Call is being forwarded) or a 182 (call Queued) from SIP peer should play local ringback towards the originating endpoint (say PSTN/ISDN). RFC 3960 mentions early media and ring-back only when a 180 Ringing is received. However I'm seeing a customer scenario involving a Microsoft OCS network forwarding calls to cell phones and sending a 181 to the gateway - expecting the originating gateway to play a ringing tone to calling party. I think it makes sense to play ringing tone and be prepared to play inband media if received, but such a scenario does not seem to be covered in rfc 3960. Appreciate your inputs. Thanks, Sunita _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors Email Scanned for Virus & Dangerous Content by : www.CleanMailGateway.com _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
