Hi, There is no need to send contact in 1xx response as message like CANCEL can use the same path (older IP which is used in INVITE) for cancel of the call. But UAC must update its IP if it gets contact in 1xx message and send next request like CANCEL using that IP.
Regards, Vishal Mathur Symantec Corporation www.symantec.com _________________________________ Office: +91-20-66067655 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ivar Sent: Wednesday, June 06, 2007 12:32 PM To: Christer Holmberg (JO/LMF) Cc: sip-implementors@cs.columbia.edu Subject: Re: [Sip-implementors] Early dialog BYE, no Contact header >("[Sip] Contact header in 1xx responses/updates remote target or not?") Hmm if i remember right rfc 3261 clearly says that only 2xx response to target refresh method will do it, may i remember wrong ... My opinion is that Contact must be there always, but unfortunately thats no the case. For example i have linksys spa 3201 pstn gateway, it doesn't send Contact for provisional responses. Christer Holmberg (JO/LMF) wrote: > Hi, > > I think most people agree that if there is no Contact there is no early > dialog - and that means no mid-dialog requests (e.g. BYE). One question is > whether it should be mandatory to include Contact in 1xx (non-100) or not. > > This is currently discussed in another thread on the SIP list ("[Sip] Contact > header in 1xx responses/updates remote target ornot?"), so you may want to > check that out. > > Regards, > > Christer > > > >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of Ivar >> Sent: 6. kesäkuuta 2007 9:11 >> To: sip-implementors@cs.columbia.edu >> Subject: [Sip-implementors] Early dialog BYE, no Contact header >> >> Hi, >> >> In RFC 3261 >> >> Contact 1xx - - - o - - >> Contact 2xx - - - m o o >> >> For there i guess it's optional, but no the case: >> >> UA1 -> UA2 >> UA2 sends ringing without Contact >> UA1 created early dialog, but wants to terminate it, it must >> send BYE ...... no contact header what should do ? >> >> _______________________________________________ >> Sip-implementors mailing list >> Sip-implementors@cs.columbia.edu >> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> >> _______________________________________________ Sip-implementors mailing list Sip-implementors@cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
