This chapter covers the following topics:
Describing the role of the gateway in an IP telephony infrastructure
Comparing analog and digital gateways with respect to interfaces and the types of telephony devices that they can connect
Describing the core gateway requirements that a gateway must have to support an IP telephony network
Describing the gateway communication protocols that Cisco CallManager supports
Adding and configuring H.323, MGCP, and non-IOS MGCP gateways in Cisco CallManager and on the gateway to interface to the IP WAN and PSTN and support analog phones and faxes ...