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Microsoft® Lync® Server 2013 Unleashed Second Edition by Randy Wintle, Alex Lewis, David Ross, Tom Pacyk

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Dual Forking

Dual forking is mentioned here only for clarity, but has not been a supported integration method since Lync Server 2010 was released. The only IP PBX ever qualified for dual forking with Office Communications Server 2007 R2 was the Nortel CS 1000. Dual forking enabled a user to have the same extension exist in both the legacy PBX and Lync Server, and incoming calls would always ring both systems. Calls would gracefully be terminated regardless of which system answered. It was pitched as the ultimate integration scenario, but proved to be a complicated setup and limited some features native to Lync.

Note

It is still technically possible with some PBX vendors to maintain the same extension in both systems, but there is no native support ...

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