Hi, I have got some basic questions about the provisional responses in SIP, 180 and 183 specifically. 1> In what cases should 180 be definitely be send as a response.A 180 response can actually contain the SDP info.Assuming that reliability PRACK for provisional responses is implemented, can a two way audio session be established before the caller has got a 200 OK.
2>Also, 183 is basically used when the call goes across different networks.Why can't simply 180 be used.. How are 180 and 183 different from each other? I mean if the dialog is going to take long so you could have a provisional response which would reset the timer for Invite response. 3>coming to early media, once the caller has send an invite it is ready to receive media( you can play announcements to the caller), what has 183 got to do with early media? Some very basic doubts, would appreciate if somebody could spend a few minutes to respond. Regards varun __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
