Subject: (Fwd) Error Condition Re: Re: SISP - Simple Internet Signalling P

From: [email-masked]
Date: Thu, 20 Jun 96 16:37:24 EDT

FROM: ED ELLESSON, RALVM6(ELLESSON) / [email-masked]
      Networking Systems Architecture, C70/B664
      P.O. 12195, Research Triangle Park, NC 27709
Subject: (Fwd) Error Condition Re: Re: SISP - Simple Internet Signalling P

Regards,
Ed Ellesson
Emerging Technologies, Networking Architecture
T-444-4115, 919-254-4115 / FAX Number: T-444-5410, 919-254-5410
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From: "Eve Schooler" <[email-masked]>
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Date: Thu, 20 Jun 1996 09:49:01 -0700
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Subject: (Fwd) Error Condition Re: Re: SISP - Simple Internet Signalling
Protocol
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Would you mind forwarding this to the [email-masked]
mailing list?  I do not wish to subscribe to the group, but since
Scott included it in the original posting, I thought I'd do the same.

Thanks,
E.

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Date: Thu, 20 Jun 1996 12:40:17 -0400
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From: [email-masked]
To: [email-masked]
Cc: [email-masked]
Subject: Error Condition Re: Re: SISP - Simple Internet Signalling Protocol

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Hi Scott,

>More seriously, there *is* overlap with *other* protocols. For example,
>it is claimed that SIP "aims to enable user mobility..." I just
>don't see what user mobility has to do with session invitation.
>"Invitation" is what you do once you have *found* the person
>you wish to invite. Aren't there other working groups which are
>aiming to enable user mobility? So I claim that the parts of SIP
>which have to do with redirection, user location, addressing, etc.,
>overlap with other problems and protocols. Some of these are in the
>domain of MMUSIC, and some are not. In any case SISP is not
>concerned with them.

By saying SIP "aims to enable user mobility..." we were *not* claiming
that SIP itself performs user location.  Rather, we were thinking of
a number of scenarios where SIP can take advantage of additional user
location services, if they exist. In particular, if a user frequents
multiple locations, and a location service tracks this mobility, then
SIP can build upon this knowledge.

For example, if the user agent initiating an invitation obtains (from a
location server) multiple addresses for a remote user, then an invitation
request can be sent to those multiple addresses simultaneously; typically a
user will reside at only one or none of those addresses, so only one of those
requests can succeed.

Another example where additional user location information is beneficial is
when the recipient (a user agent or proxy) of a SIP invitation acts to
forward or to redirect the request.  Again, the knowledge about the
alternate user addressing is obtained from a location server.
SIP just makes use of that knowledge.

In these types of situations, I would claim SIP enables or facilitates user
mobility, i.e., SIP does not require that a user be associated with a rigid
address.  Section 4 of the SIP draft provides further explanation
of the relationship between SIP and location servers.

E.

---End of forwarded mail from [email-masked]

---

From: [email-masked] (RALPH K.B.CLAY)
Date: Thu, 20 Jun 1996 15:23:58 -0700

;allthis garbage and I do not want anyh of it.  please take me off 
yhour list  thankyhou yacl