Hi Kumar, Probably incomplete but my 2 cents:
An UA must respond to an UPDATE request immediately. In other words, there is no time to get user input. For example, if you need to add a video stream to an already established voice call you will probably need a re-INVITE unless you have a special case and permissions from the destination were already provided etc etc etc. An early media session established in an INVITE transaction can be updated by an UPDATE request. Clearly you can not use re-INVITE. Check out RFC6337 for offer/answer usage patterns. UPDATE can be used without a SDP payload (target refresh purposes for example) but not a re-INVITE. You must exhcange offer/answer even if it is a re-play. I hope these help. Best, -volkan On Thu, Jun 4, 2015 at 8:56 AM, kumar uppu <kumar94...@gmail.com> wrote: > HI every one, > > > 1)What is the difference between Re-Invite and Update > 2)what are the mandatory thing need to remember, while sending UPDATE and > Re-Invite > > Thanks > > -- > Kumar > > > ------------------------------------------------------------------------------ > > _______________________________________________ > Sipp-users mailing list > Sipp-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sipp-users > >
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