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

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Direct Federation

The final form of federation is really the legacy version that was introduced back in Live Communications Server 2005. Direct federation requires each partner to specify the SIP domain name and the Access Edge service FQDN providing that federation service. Direct federation operates the same way as enhanced federation in that it doesn’t allow any more messages per second, and it requires greater administrator overhead. Not only do users need to request federation with a specific partner’s SIP domain, but the Lync administrators from both parties must now meet to exchange information about what server names are used.

The main use case for direct federation is when the Edge Server’s FQDN does not match the partner’s SIP domain. ...

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