Best Practices When Implementing SIP Trunks for PSTN Access

This paper summarizes the best practices for planning, preparing, and deploying Session Initiation Protocol (SIP) trunking for public-switched-telephone-network (PSTN) access in an enterprise network. Several areas of best practices are covered, including: Providers, Deployment, Network design, Protocols and codecs, Cisco Unified Communications Manager (UCM), Session Border Controller (SBC), Security, Redundancy