/mcpC H A P T E R 50 Music On Hold • Music On Hold Overview, on page 615 • Interwork External Multicast MOH to Unicast MOH, on page 619 • Music On Hold Prerequisites, on page 620 • Music On Hold Configuration Task Flow, on page 620 • Unicast and Multicast Audio Sources, on page 627 • Music On Hold Interactions, on page 629 • Music On Hold Restrictions, on page 630 • Music On Hold Troubleshooting, on page 632 Music On Hold Overview Use the integrated Music On Hold (MOH) feature to place on-net and off-net users on hold with music from a streaming source. This source makes music available to any on-net or off-net device that you place on hold. On-net devices include station devices and applications that an interactive voice response (IVR) or call distributor places on hold, consult hold, or park hold. Off-net users include those users who are connected through Media Gateway Control Protocol (MGCP) or Skinny Call Control Protocol (SCCP) gateways, Cisco IOS H.323 gateways, and Cisco IOS Media Gateway Control Protocol gateways. The system also makes the Music On Hold feature available for Cisco IP POTS phones that connect to the Cisco IP network through Foreign Exchange Station (FXS) ports on Cisco IOS H.323 or MGCP and for Cisco MGCP or SCCP gateways. Start Cisco Unified Communications Manager to create a media resource manager. Music On Hold server registers to the media resource manager with its music on hold resources. Music On Hold server is a software application that provides music on hold audio sources and connects a music on hold audio source to multiple streams. When an end device or feature places a call on hold, Cisco Unified Communications Manager connects the held device to a music resource. When the held device is retrieved, it disconnects from the music on hold resource and resumes normal activity. Caller-Specific Music On Hold For SIP calls that a phone receives over the SIP trunk, Cisco Unified Communications Manager can use a different MOH audio source. Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 615