http://blogs.technet.com/b/nexthop/archive/2008/05/20/sip-trunking-in-office-communications-server.aspxAuthor: Russell Bennett Publication date: May 2008 Product version: Office Communications Server 2007 R2 In the Office Communications Group (OCG) white paper “Integrating Telephony with Office Communications Server 2007” ween-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)