The document discusses best practices for deploying Microsoft OCS with SIP trunking. It summarizes IntelePeer's cloud-based voice peering network and SIP trunking services. It also provides guidance on common activation issues, reference architectures, quality considerations, and keys to evaluating SIP trunking providers. IntelePeer offers a Fast Start program that provides a 30-day evaluation of their SIP trunking services for Microsoft OCS.