Cisco CP-7911G-CH1 Administration Guide - Page 283
Information About Using Cisco Unified SRST Gateways as a Multicast MOH Resource
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Appendix B: Integrating Cisco Unified Communications Manager and Cisco Unified SRST to Use Cisco Unified SRST Information About Using Cisco Unified SRST Gateways as a Multicast MOH Resource Information About Using Cisco Unified SRST Gateways as a Multicast MOH Resource To configure Cisco Unified SRST gateways as an MOH resource, you should understand the following concepts: • Cisco Unified SRST Gateways and Cisco Unified Communications Manager, page 283 • Codecs, Port Numbers, and IP Addresses, page 284 • Multicast MOH Transmission, page 286 • MOH from a Live Feed, page 286 • MOH from Flash Files, page 287 Cisco Unified SRST Gateways and Cisco Unified Communications Manager Cisco Unified SRST gateways can be configured to multicast Real-Time Transport Protocol (RTP) packets from flash memory during fallback and normal Cisco Unified CM operation. To make this happen, Cisco Unified Communications Manager must be configured for multicast MOH so that the audio packets do not cross the WAN. Instead, audio packets are broadcast from the flash memory of Cisco Unified SRST gateways to the same multicast MOH IP address and port number configured for Cisco Unified Communications Manager multicast MOH. IP phones at remote sites are able to pick up RTP packets that are multicast from the local branch gateways instead of from the central Cisco Unified CM. Multicast MOH for PSTN callers is supported when the Cisco Unified SRST router is used as the Cisco IOS voice gateway for Cisco Unified CM. In this state the Cisco Unified SRST function of the router remains in standby mode (no phones registered) with call control of the phones and gateway provided by Cisco Unified Communications Manager. This feature does not apply when the Cisco Unified SRST router is in fallback mode (phones are registered to Cisco Unified SRST). Instead, MOH is provided to PSTN callers via a direct internal path rather than through the multicast loopback interface. Figure 1 shows a sample configuration in which all phones are configured by Cisco Unified Communications Manager to receive multicast MOH through port number 16384 and IP address 239.1.1.1. Cisco Unified CM is configured so that multicast MOH cannot reach the WAN, and local Cisco Unified SRST gateways are configured to send audio packets from their flash files to port number 16384 and IP address 239.1.1.1. Cisco Unified CM and the IP phones are spoofed and behave as if Cisco Unified CM were originating the multicast MOH. Note Phone users at the central site would use multicast MOH from the central site. OL-13143-04 Cisco Unified SCCP and SIP SRST System Administrator Guide 283