Subject: I-D ACTION:draft-lebovits-sip-in-00.txt

From: [email-masked]
Date: Fri, 07 Jul 2000 07:13:28 -0400

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

	Title		: SIP/IN Interworking
	Author(s)	: D. Lebovits
	Filename	: draft-lebovits-sip-in-00.txt
	Pages		: 11
	Date		: 06-Jul-00
	
The goal of this document is to identify and propose a new work item
for the IETF. This document describes the PSTN Intelligent Network (IN) 
Architecture support of Session Initiation Protocol (SIP) networks. 
The concept of the 'Soft-SSF' is introduced which acts as an overlay 
between the IP telephony call control and the Intelligent Network 
layer provided by the IN Service Switching Function (SSF) and the IN Service Control Function (SCF). This 'Soft-SSF' provides the necessary mapping between the SIP protocol state machine and the IN Basic Call State Model (BCSM). Also introduced is the Call Manager Function (CMF) which acts as a Mediation Node. 
The CMF entity is responsible for passing service related information to and from IN service layer, namely the SCF, and managing the service control relationship. As such, the CMF may contain a SSF-like functionality or subset thereof, to model the pre and post conditions that are required to interact with an SCF. The document specifically deals with the proposed standardized interfaces between the functional entities identified in the IN Network with associated functional entities represented in the SIP network. A mapping of parameters of the SIP protocol to the Intelligent Network Application Part Protocol(INAP) may be required for the support of the SIP Proxy Server call control protocol, states and events. Thereby enabling the Mediation Node (CMF) 
to model a SIP Proxy server. It is the proposal of this document to define the Mediation Node(CMF)to Soft SSF interface as a work item in the IETF as it is presently not a subject for standardization.

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