Cisco CP-7911G-CH1 Administration Guide - Page 287
MOH from Flash Files, Audio Source, Description, How to Con
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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 MOH from Flash Files The MOH Multicast from Flash Files feature facilitates the continuous multicast of MOH audio feed from files in the flash memories of Cisco Unified SRST branch office routers during Cisco Unified Communications fallback and normal Cisco Unified Communications service. Multicasting MOH from individual branch routers saves WAN bandwidth by eliminating the need to stream MOH audio from central offices to remote branches. The MOH Multicast from Flash Files feature can act as a backup mechanism to the MOH live feed feature. Using the Flash to backup the live-feed is the recommend method rather than using just the live feed feature alone. Cisco Unified Communications Manager MOH audio files must reach the WAN and another set must not. Audio packets from the central Cisco Unified CM must cross the WAN to reach branches running Cisco Unified CM. For branches running Cisco Unified SRST, the packets must not reach the WAN. Table 1 provides a summary of options for MOH. Table 1 Music-on-Hold (MOH) Audio Source Flash memory Live feed Live feed and flash memory Description How to Configure No external audio input is required. Configuring Cisco Unified SRST for Multicast MOH from an Audio File, page 296 The multicast audio stream has minimal delay for local IP phones. The MOH stream for PSTN callers is delayed by a few seconds. If the live feed audio input fails, callers on hold hear silence. Configuring Cisco Unified SRST for MOH from a Live Feed, page 306 The live feed stream has a few seconds of delay for both PSTN and local IP phone callers. The flash MOH acts as backup for the live-feed MoH. We recommend this option if you want live-feed because it provides guaranteed MOH if the live-feed input is not found or fails. Configuring Cisco Unified SRST for Multicast MOH from an Audio File, page 296 and Configuring Cisco Unified SRST for MOH from a Live Feed, page 306 OL-13143-04 Cisco Unified SCCP and SIP SRST System Administrator Guide 287