Re: What is a "session"?

[James Kempf <James.Kempf@Sun.COM>]

Erik,

I think there is a way to do this defined within SIP within the context of the user
mobility support. The REGISTER command allows reregistering at another location.
I am not entirely sure if this is supported for an ongoing session, though I 
recall seeing some proposals at one point for this.

		jak

>> Erik,
>> 
>> I think there is a fairly clear notion of what a session is for
>> multimedia data in which SIP is used to make the initial connection
>> (after all, SIP is the Session Initiation Protocol). SIP defines
>> the INVITE to start a session and BYE to terminate it. The state
>> involved in maintaining the session is identified in the SDP message
>> within the INVITE 
>
>A agree that SIP defines what a session is in the SIP context.
>But the document doesn't talk about "SIP sessions" but an
>general notion of "session" which is confusing at best.
>
>
>Has there been any study on what it would take to, in general,
>move SIP sessions from one device to another device e.g. from
>a phone to a laptop? (independent of the actual session/application)
>Do we know that this is feasible in general, or does it actually
>require application specific awareness of SIP session mobility to
>make it work?
>
>  Erik
>