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Title : Implementing Multiple Line Appearances using the Session Initiation Protocol (SIP)
Author(s) : A. Kumar, et al.
Filename : draft-anil-sipping-bla-04.txt
Pages : 46
Date : 2007-3-6
This document describes the implementation of a group telephony
feature commonly known as Bridged Line Appearance (BLA), Multiple
Line Appearance (MLA), or Shared Call/Line Appearance (SCA). When
implemented using the Session Initiation Protocol (SIP), it is
referred to as Multiple Appearances. This feature is commonly
offered in the IP Centrex services and IP-PBX offerings and is likely
to be implemented on SIP IP telephones and SIP feature servers used
in a business environment. This specification defines a new SIP
dialog event package tag "appearance" and a method for a group of SIP
user agents to coordinate the identification of appearances between
them using SIP dialog package subscriptions.
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