I-D ACTION:draft-gurbani-sin-01.txt

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	Title		: SIP-IN Interworking Protocol Architecture and 
                          Procedures
	Author(s)	: V. Gurbani, F. Haerens, V. Rastogi
	Filename	: draft-gurbani-sin-01.txt
	Pages		: 25
	Date		: 28-May-02
	
The aim of the SIP/IN Interworking (SIN) IETF design team is to
consider the support of existing IN-based applications in a SIP-
based IP  environment for IP-Host-to-Phone calls. There are many
telephony applications based on IN: 800 (freephone), PSTN VPN, credit
card calling, to name a few.
The design team work items are:
o Interpreting IN Call Models for the SIP environment
o Mapping IN messages into (sequences of) SIP messages and vice
versa
o Mapping IN parameters into SIP parameters and vice versa
o Defining SIP extensions, if necessary
It was agreed that the contributors on the SIN design team should
first publish respective I-Ds, which are then used as the basis of
one or more Informational RFCs that will be the major output of the
design team. This draft is the first output of the IETF SIN design
team and addresses the first work item.  It outlines the architecture
and procedures of SIP-IN (SIN) Internetworking as well as establishes
the call model mapping between the IN Call Model and the SIP protocol
state machine.
An overall objective is to ensure  that IN control of VoIP services
in networks can be readily specified and implemented by adapting
standards and software used in the present networks. This approach
leads to services that function the same when a user connect to
present or future networks, simplifies service evolution from present
to future, and leads to more rapid implementation.

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