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I-D ACTION:draft-gurbani-spirits-implementation-00.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.


	Title		: Early implementation of the Services in PSTN 
                          requesting Internet services (SPIRITS) protocol
	Author(s)	: V. Gurbani et al.
	Filename	: draft-gurbani-spirits-implementation-00.txt
	Pages		: 12
	Date		: 2003-2-21
	
The SPIRITS protocol defines the mechanisms and the semantics to
subscribe to and convey certain PSTN events to interested Internet
hosts for service execution [1].  This Internet-Draft describes our
initial implementation of a SPIRITS framework based on the
architecture and requirements outlined in [2] and [3], respectively.
We have implemented two services based on such an architecture: a
SPIRITS-based presence service which provides a coarse-grained
presence status for a user represented by a device (phone), and a
SPIRITS-based Instant Messaging (IM) service whereby the PSTN sends a
SIP IM to a SPIRITS User Agent (UA).  These services, the attendant
architecture and the relevant call flows are described next.
It is expected that the reader is conversant in the SPIRITS and SIP
terminology.  For those who are not, [5,6] provide a good reference
for SIP and its event-based mechanism, and [1,2,3] provide a good
reference for SPIRITS.
It is important to point out that the SPIRITS protocol [1] is not a
standard yet, it is still an Internet-Draft.  Thus, what is described
in this draft is an early implementation designed to validate the
suitability of the protocol as well as provide some implementation
experience that will be leveraged in further refining the protocol.

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