Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Music On Hold

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_m7ca6519_00_music-on-hold-12-0.html

Published

2026-09-16

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco documentation; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• For media resources such as Music on Hold, a device uses the Media Resource Group List set on its own configuration, and falls back to its device pool's MRGL if none is set. in context
• Up to 501 MOH audio sources, numbered 1 to 501, can be configured. The fixed MOH device uses source 51. in context
• Unified CM MOH supports the G.711 mu-law, G.711 a-law, G.729 and L16 256K wideband codecs. in context
• When the Cisco IP Voice Media Streaming Application runs on a dedicated server on the 7500 or 10K OVA, the MOH guide states capacity of 1000 held callers, 500 MOH sources, and 300 to 700 annunciator callers, with one MOH codec. in context
• Cisco warns that the G.729a codec may not give acceptable audio quality for music. in context
• The held party's MRGL determines which MOH resource Unified CM allocates, using the device MRGL or, if the device has none, the device pool MRGL. in context
• User hold is invoked when a user presses the Hold button or softkey. Network hold is invoked automatically when a user activates Transfer, Conference or Call Park. in context
• Multicast MOH supports IPv4 only. in context
• For multicast MOH, the media resource group must include an MOH server set up for multicast, and the Use Multicast for MOH Audio check box must be checked on that group. in context
• An MOH server can transcode among the G.711 mu-law, G.711 a-law and L16 256K wideband MOH codecs, but it cannot transcode for G.729. in context
• CTI devices and MTP devices do not support multicast MOH. in context
• The Cisco IP Voice Media Streaming Application service must be activated to enable Music On Hold. in context
• If an MOH server fails during an active MOH session, the held party hears no music from then on, but normal call functions are not affected. in context
• For caller-specific MOH, if the user and network MOH audio source identifiers are not provisioned, the caller-specific MOH information in the SIP header is ignored and the call reverts to tone on hold. in context
• Unicast MOH streams go directly from the MOH server to the requesting endpoint. Multicast MOH streams go to a multicast group IP address, which endpoints join as needed. in context

Cite this source record

APA

WarmTransfer. (2026, September 16). Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Music On Hold. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cucm-featconfig-15-music-on-hold

BibTeX

@misc{warmtransfer-cisco-cucm-featconfig-15-music-on-hold,
  title  = {Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Music On Hold},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cucm-featconfig-15-music-on-hold},
  note   = {Cisco Systems, accessed 2026-09-24}
}