Connecting Multiple Cisco CMEs with VoIP

This chapter covers the following topics:

• General considerations when integrating Cisco CallManager Express (CME) in H.323 and Session Initiation Protocol (SIP) voice over IP (VoIP) networks
• Integrating Cisco CME into an H.323 network with or without a gatekeeper
• dual-tone multifrequency (DTMF) relay for H.323
• Call transfer and call forwarding within an H.323 network using H.450
• Integrating Cisco CME into a SIP network

This chapter describes the ways in which you can use Cisco CME as a component of a larger network using the two major voice over IP (VoIP) protocolsH.323 and SIPto link multiple Cisco CME systems. It examines some of the considerations that apply within a networked environment that do not arise in simpler standalone configurations. This chapter focuses on the call handling implications of using Cisco CME in a network. The administration of networked systems is covered in Chapter 14, "Configuring and Managing Cisco IPC Express Systems."