RE: [Sip] rsvp or manyfolks in 3gpp

[Michael Thomas <mat@cisco.com>]

Um, folks, before you eject the baby with the
bathwater, somebody better do some explaining how
it is that a SIP appliance connected through a
mobile router convinces that mobile router to put
my RTP bits on the A-list.

We're supposedly here for a slightly longer term
thinking than the range of the 3GPP moment.

	  Mike

Chen, Xin (Xin) writes:
 > Good question.
 > 
 > There are two types of PDP contexts for a 3GPP IMS terminal,
 > 
 > One is used for SIP signalling only which is free of charge, and another one
 > is used for media traffic.
 > 
 > Each PDP context has to associate with a set of QoS parameters.
 > 
 > In order to activate the media traffic PDP context, the users has to know
 > the QoS prameters needed for this session (media type, codec,
 > bandwidth.....), these information is from the SDP exchange between
 > terminals which is carried in SIP signalling message in the signalling PDP
 > context. This is why you have to have signalling first, then real time
 > traffic PDP context comes into play.
 > 
 > Xin Chen
 > 
 > Lucent Technologies
 > Tel: +44 1793 883137
 > Mobile: +44 7799 034668
 > 
 > 
 > -----Original Message-----
 > From: Juha Heinanen [mailto:jh@lohi.eng.song.fi]
 > Sent: 18 March 2002 21:42
 > To: Chen, Xin (Xin)
 > Cc: sip@ietf.org
 > Subject: RE: [Sip] rsvp or manyfolks in 3gpp
 > 
 > 
 > Chen, Xin (Xin) writes:
 > 
 >  > [xc] Miguel was right that we need manyfolks because it provides the
 >  > precondition so that calling user can prevent the called user from
 > ringing
 >  > until the calling user completes the PDP context activation. But this
 >  > doesn't mean that 3GPP terminals have to support any QoS reservation
 >  > protocol.
 > 
 > that makes sense, but i still don't understand why anything beyond basic
 > sip is needed for this purpose.  why can't it be a standard behavior of
 > a 3gpp terminal always first try to setup a real time pdp context for
 > the media and send the invite or generate ringing only if the setup
 > succeeds?
 > 
 > -- juha
 > 
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