Hi In this case , 200 ok SDP will be converted to be sent in same dialog where first 180 was sent to A .
If you delay sending 180 to A till some one answers , then think of User A who has made a call but his phone screen is in dialling state but no ringback tone heard.Its like complete silence for him. As local ringback tone is generated by UE A (by reserving DSP resources) after getting 180 and played to user. Regards Ankur Bansal On Fri, Mar 18, 2016 at 1:10 AM, Ramachandran, Agalya (Contractor) < agalya_ramachand...@comcast.com> wrote: > Hi Ankur, > > > > I understand your point. But I have a question in Scenario 1. Let’s assume > that A side fork is not supported. > > If proxy forks the call, it receives two 180 Ringing response without SDP. > If we relay the 1st 180 and if 2nd 180 is consumed by proxy, > unfortunately the 2nd person attends the call in Side B(which proxy will > not be aware when it consumes 180), proxy will relay 200 OK from 2nd > person. Now the 180 Ringing sent to side A and 200 OK will have different > to-tags right? > > > > Am not clear in this use-case. > > That’s why I have asked proxy should forward only the ringing response in > which call leg it has been answered ? > > > > Regards, > Agalya > > *From:* ankur bansal [mailto:abh.an...@gmail.com] > *Sent:* Thursday, March 17, 2016 2:59 PM > *To:* Ramachandran, Agalya (Contractor) <agalya_ramachand...@comcast.com> > *Cc:* sip-implementors@lists.cs.columbia.edu > *Subject:* Re: [Sip-implementors] Query in handling 180 response by proxy > > > > Hi Agalya, > > > > Very specific to your scenario for 180 without SDP , > > There can be 2 scenarios based on which it depends whether to send all > forked 180 or not . > > A side fork not supported :First 180 sent and next 180 with different > to-tag is consumed by proxy > > A side fork supported : Both 180s relayed to A. > > > > >>>>Is this right behavior of proxy or it should forward only the ringing > response in which call leg it has been answered ? > > As mentioned there is no harm in relaying forked 180s if A supports fork, > later when final success response comes > > it can be relayed too. > > > > Thanks & regards > > Ankur Bansal > > > > On Tue, Mar 15, 2016 at 9:08 PM, Ramachandran, Agalya (Contractor) < > agalya_ramachand...@comcast.com> wrote: > > Hi All, > > If an Invite request is received to a proxy, proxy then forks the Invite > message to two destinations. > 180 Ringing Response is received from both the destinations to the proxy. > Proxy is now forwarding both 180 Response to the request originator. > Is this right behavior of proxy or it should forward only the ringing > response in which call leg it has been answered ? > Can anyone clarify me on this.? > > Regards, > Agalya > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > > > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors