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I-D ACTION:draft-yu-tel-url-03.txt

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	Title		: Extensions to the 'tel' and 'fax' URLs to Support 
                          Number Portability and Freephone Service
	Author(s)	: J. Yu
	Filename	: draft-yu-tel-url-03.txt
	Pages		: 12
	Date		: 14-Nov-01
This document proposes some extensions to the 'tel' and 'fax' Uniform 
Resource Locators (URLs) for supporting number portability (NP) and 
freephone service.  Those proposed extensions allow the Session 
Initiation Protocol (SIP) to carry those URLs or to convert those 
URLs to the SIP URL so as to support NP and freephone service.  The 
proposed extensions allow the SIP protocol to be used to derive the 
routing number for the ported geographical numbers, identify the 
freephone service provider/carrier or the Plain Old Telephone Service 
(POTS) number for a freephone number, and carry the NP- and 
freephone-related information in the SIP messages.

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