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Title : Extensions to the 'tel' URL to Support Number
Portability and Freephone Service
Author(s) : J. Yu
Filename : draft-yu-tel-url-07.txt
Pages : 12
Date : 2003-1-8
This document proposes three extensions to the 'tel' Uniform Resource
Locator for supporting number portability (NP) and freephone service.
Those proposed extensions allow the Session Initiation Protocol to
carry the tel URL or to convert the tel URL 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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