Thanks All for your response. I did try to send Ack with "sendrecv" attribute, but still it doesn't work. Do we have any RFC describing call flow for various scenarios?
Regards, Amarnath On Wed, Dec 19, 2018 at 2:08 PM Olle E. Johansson <o...@edvina.net> wrote: > > > > On 19 Dec 2018, at 09:28, Richard Phernambucq <r.phernamb...@cuperus.nl> > wrote: > > > > Hi Amarnath, > > > > A Re-Invite without SDP is called a late offer and isn't the same as > resuming a call that was placed on hold. > > > > If 'UAS' wanted to resume the call it should have sent an SDP body with > sendrecv attribute. > I don’t agree. The UA sending re-invite without SDP is asking the other > side “what is your > opinion on the state right now.” > > Hold is a state that can exist separately on both sides, it doesn’t really > apply to the call. > > /O > > > > Best regards, > > Richard > > > > > > On 19-12-2018 06:28, Amarnath Kanchivanam wrote: > >> Hi, > >> > >> I have below call flow and would like to know the correct behavior. > >> > >> UAC UAS > >> INVITE -----------------> > >> <---------------200 OK > >> Ack ----------------------> > >> > >> Now UAS puts call on Hold > >> > >> <---------------Re-Invite with send-only > >> attribute > >> 200 OK ----------> recv-only > >> <--------------Ack > >> > >> Now UAS does Un-Hold > >> <-------------Re-Invite* without SDP* > >> 200 OK ----------> recv-only > >> <----------------Ack with SDP > >> > >> In final Ack there is no SDP attribute (sendrecv or send-only). With > this > >> call flow UAC failed to Un-Hold and continue to be on hold operation. > >> I would like you to share your comments which would help to understand > the > >> correct behavior. > >> > >> Regards, > >> Amarnath > >> _______________________________________________ > >> 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 > > _______________________________________________ > 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
