Registration for Multiple Phone Numbers in the Session Initiation Protocol (SIP)

Document Type Replaced Internet-Draft (individual)
Author Adam Roach 
Last updated 2010-04-08 (latest revision 2010-03-24)
Replaced by RFC 6140
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document defines a mechanism by which a SIP server acting as a traditional Private Branch Exchange (PBX) can register with a SIP Service Provider (SSP) to receive phone calls for extensions designated by phone numbers. In order to function properly, this mechanism relies on the fact that the phone numbers are fully qualified and globally unique.


Adam Roach (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)