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I-D ACTION:draft-elwell-sipping-qsig2sip-03.txt

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	Title		: Interworking between SIP and QSIG
	Author(s)	: J. Elwell et al.
	Filename	: draft-elwell-sipping-qsig2sip-03.txt
	Pages		: 55
	Date		: 2002-10-24
This document specifies interworking between the Session Initiation 
Protocol (SIP) and QSIG within corporate telecommunication networks 
(also known as enterprise networks). SIP is an Internet application-
layer control (signalling) protocol for creating, modifying, and 
terminating sessions with one or more participants. These sessions 
include, in particular, telephone calls. QSIG is a signalling 
protocol for creating, modifying and terminating circuit-switched 
calls, in particular telephone calls, within Private Integrated 
Services Networks (PISNs). QSIG is specified in a number of ECMA 
Standards and published also as ISO/IEC standards. 
As the support of telephony within corporate networks evolves from 
circuit-switched technology to Internet technology, the two 
technologies will co-exist in many networks for a period, perhaps 
several years. Therefore there is a need to be able to establish, 
modify and terminate sessions involving a participant in the SIP
network and a participant in the QSIG network. Such calls are 
supported by gateways that perform interworking between SIP and QSIG. 
This document is a product of the authors' activities in ECMA 
(www.ecma.ch) on interoperability of QSIG with IP networks.

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