Hi , You can treat this as an indication that the necessary info to route the call is availanble and Call is proceeding " "Call Proceeding" or Progress message can be sent for H323 and for SS7 "ACM or equivalent" message based on the national standards/specifications can be sent. The backward message does not have to necessarily mean a ring-back tone always.
Kasturi -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Huseyin ALTUN Sent: Friday, March 16, 2007 6:52 AM To: Christer Holmberg (JO/LMF); Bu, Wen Fei (Leo); Will Quan; [email protected] Subject: Re: [Sip-implementors] 183 without SDP Hi, If the call / request is started from an H.323 GW to an SBC and SBC is doing IWF to SIP, what will be the message is being sent to H.323 GW if SBC receives a 183 without SDP? (It is alerting) Or If it is a MG and doing SIP-SS7, again what will happen? I think in both scenario, calling party will hear a fake ring back tone (which is played locally) and then will get the tone (whatever it is) coming with SDP. If there is a way to give reliable information (announcement, special ring back tone), fake information should not be provided to calling party? Is this right? Thanks, Huseyin Huseyin Altun -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Christer Holmberg (JO/LMF) Sent: Friday, March 16, 2007 7:43 AM To: Bu, Wen Fei (Leo); Will Quan; [email protected] Subject: Re: [Sip-implementors] 183 without SDP Hi, >183 should always take an SDP. >But the gateway could send a 180 first, then a 183 with SDP. I don't know what you mean by "should always take", but it is allowed to send 183 without SDP (unless the offer/answer rules requires SDP to be included). Regards, Christer > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Will > Quan > Sent: 2007年3月15日 14:03 > To: [email protected] > Subject: [Sip-implementors] 183 without SDP > > Is it acceptable for a gateway to send a 183 without SDP and then one > second later send another with SDP?--will > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
