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CCIE Voice v3.0 Quick Reference by Mark Lewis

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Chapter 9. Application Protocols

With the exception of traffic corresponding to active voice calls, other traffic that can be transported over telephony networks includes Music on Hold (MoH), video, fax, and modem traffic.

IP Multicast

IP multicast can be used for a couple of different purposes in an IP telephony network. CUCM MoH can be sent across the network using multicast transport. In addition, if H.323 gatekeepers are being used in a network, endpoints can use multicast autodiscovery to locate these gatekeepers.

Multicast can be enabled in a campus-only environment, or it can be enabled in an interdomain environment. Protocols and mechanisms that are commonly used to enable multicast in a campus environment include Internet Group Management ...

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