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require access to MoH servers (to hear an MoH stream) must have access to those MoH servers defined in MRGs/MRGLs.
MRGs can be configured by navigating to Media Resources, Media Resource Group in CUCM Administration. When configuring
an MRG, you must define an MRG name and available media resources (such as MoH, MTP, and annunciator resources) for the
MRG. You can also specify within the MRG configuration whether multicast can be used for MoH audio.
Media resources in an MRG are used in a round-robin fashion, with the exception of conference bridge resources, which are used
based on the greatest number of resources available. It is possible to specify the same resource in more than one MRG.
Note that, by default, all media resources are placed in the null MRG, which is a MRG that exists even when no MRGs have been
explicitly defined on the system.
MRGLs can be added by navigating to Media Resources, Media Resource Group List in CUCM Administration. When adding an
MRGL, you must specify a name and add the required MRGs to the MRGL in the desired prioritized order. It is possible to assign the
same MRG to more than one MRGL.
Once defined, MRGLs can be assigned to either devices or device pools.
MoH relies on the Cisco IP Voice Media Streaming Application. Cisco IP Voice Media Streaming Application also provides software
annunciator, software conference bridge, and media termination point (MTP) resources. If the Cisco Media Streaming Application is
running, these resources are automatically enabled.
Audio sources for MoH can be either live or recorded, and MoH streams can be either unicast or multicast in nature. A maximum of
51 audio sources can be configured within a CUCM cluster, and all MoH servers within the CUCM cluster rely on the same sources.
There can be a total of 50 audio sources in the form of audio files, and 1 fixed audio source (audio source 51), which is usually a
sound card installed in a server.
It is possible for MoH servers to support a maximum of 500 unicast MoH streams or 204 multicast audio streams. The exact number
supported depends on factors such as the CPU and whether the server providing the MoH is a dedicated MoH server.
Multicast is often viewed as being an attractive method of transmitting MoH because of the reduced CPU overhead on the source
device and reduced bandwidth consumption on the network.
 
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