Cisco Voice Gateway and Gatekeeper provides a complete solution for real-world problems encountered when implementing a VoIP network. It will initially serve readers as a reference for complex gateways and gatekeepers and dissemination will also be a valuable study aid for Certifified Cisco Voice Professional (CCVP) certification track. Cisco Voice Gateway and Gatekeepers is divided into five sections. Part two focuses on how to use the gateway; work with MGCP, H.323, and SIP, connecting to the PSTN, PBX, and IP WAN; configure the dial peer elementary and secondary education, and implementing SRST.