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By now it's become a mantra: The Session Initiation
Protocol (SIP) is the future of VoIP. The vendors are saying it, and the
network designers are building for it. Even Cisco Systems, the only major
VoIP vendor not to offer native SIP client support, will add the capability
to its next major release of Cisco Call Manager expected at the end of the
year. All this begs the question, just what should network architects be
considering when they evaluate an IP PBX?
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