CH A P T E R
Multicast Music-on-Hold and IP/TV Configurations
This chapter discusses the basics of MMoH and IP/TV implementation. Detailed configuration and design for both MoH and IP/TV are not covered; only the basic layout is needed to enable multicast operation.
Call Manager version 3.1 and higher allows for the configuration of MoH services. Unicast and Multicast MoH streams can be generated by two source types.
A file source uses actual files located on the MoH server to “play” or stream audio music out to the network.
A fixed source uses a soundcard located in the MoH server. The soundcard can connect a wide-range of devices, such as CD and cassette players.
There are two types of hold that can be used with MoH. Network hold is used when features, such as transfer, conference, and call-park, are used. User hold is used when the IP phone user selects the “hold” softkey. The following are guidelines for implementing MoH with IP multicast: Use an IP multicast address group range from the administratively scoped address range.
Enable multicast on the MoH server and enter the starting address range selected from the scoped range.
Increment the multicast streams on IP addresses. Use the G.711 CODEC on the LAN and the G.729 CODEC for streams crossing the WAN. Change the default “Max Hops” or TTL to a value representative of the routed network. Enable multicast for each of the selected audio sources. Enable the user and network hold sources for each IP phone.
Over provision the Low-Latency Queue (LLQ) by one or two streams to account for the additional traffic brought on by MoH.
It is important to understand the basic operation of how the MoH server provides music to the IP phone. Figure 7-1 illustrates a MoH setup.
Cisco AVVID Network Infrastructure IP Multicast Design