RE: [Sip] Open Issue #58: Rejected mid-call SDP in 2xx

My comments below...

> -----Original Message-----
> From: sip-admin@ietf.org [mailto:sip-admin@ietf.org]On Behalf Of
> Jonathan Rosenberg
> Sent: Friday, September 07, 2001 4:56 PM
> To: 'brett@broadsoft.com'; Jonathan Rosenberg
> Cc: sip@ietf.org
> Subject: RE: [Sip] Open Issue #58: Rejected mid-call SDP in 2xx
>
>
>
>
>
>
> > -----Original Message-----
> > From: Brett Tate [mailto:brett@broadsoft.com]
> > Sent: Friday, September 07, 2001 4:10 PM
> > To: 'Jonathan Rosenberg'
> > Cc: sip@ietf.org
> > Subject: RE: [Sip] Open Issue #58: Rejected mid-call SDP in 2xx
> >
> >
> > Sounds fine with me.  However I guess that the
> > "MUST" will have implications for devices that
> > can't or don't distinguish between INVITE and
> > re-INVITE after having underwent a restart.
>
> I had forgotten about this case. Good observation.
>
> > I guess that these UA's would have to persist
> > parts of the SDP if they wish to allow a
> > re-INVITE without SDP to re-establish a call
> > (which I don't recommend).
>
> I agree that thats ugly.
>
> I suppose that we could say that its a MUST to use the
> existing SDP if you
> know it. A UA that sends a re-INVITE w/o SDP MUST be prepared
> for SDP that
> may be different for the reason you describe. Hopefully its something
> acceptable. If its not, BYE the call. I don't think we can
> reasonably do
> better. We're already talking about the case where the UA has
> failed and
> recovered.
>
> Sound OK?
>

Yes.  IMO, in the case a UA has failed and recovered it's reasonable to
expect problems in sessions that involve "complicated" media negotiation.
In more common cases, session re-establishment should work fine.

Regards,
Bert

> -Jonathan R.
>
>
>
> ---
> Jonathan D. Rosenberg, Ph.D.                72 Eagle Rock Ave.
> Chief Scientist                             First Floor
> dynamicsoft                                 East Hanover, NJ 07936
> jdrosen@dynamicsoft.com                     FAX:   (973) 952-5050
> http://www.jdrosen.net                      PHONE: (973) 952-5000
> http://www.dynamicsoft.com
>
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