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All media resources are located in a null media resource group by default. Usage of media
resources is load balanced between all existing devices. Hardware resources are preferred
in the selection algorithm based on their enhanced capabilities (multiple audio codec
support) and the reduction of load on the CUCM.
Media resource management controls and manages the media resources within a cluster.
The Media Resource Manager (MRM) service enhances CUCM features by making it
easier for CUCM to control access to transcoder, annunciator, conferencing, MTP, and
MoH resources.
Media resource groups (MRG) define logical groupings of media resources. MRGs create
a logical collection of resources and are normally arranged to service a geographical
location.
Media resource group lists (MRGL) specify a list of prioritized MRGs. An application
can select required media resources from among the available resources according to the
priority order that is defined in the MRGL. MRGLs are assigned to devices or device pools.
Figure 15-19 illustrates the hierarchical processing order of media resources. MRGLs are
similar to route lists, whereas MRGs are similar to route groups.
Figure 15-19 Media Resource Management
IP
Media Resource
1
Media Resource
2
Media
Resource
Group
Media
Resource
Group
Media
Resource
Group List
Media
Resource
Manager
Media Request
First
Choice
Second
Choice
Assigned to Device
or Device Pool
Similar to Route Lists and
Route Groups
Media Resource
3
Media Resource
4
Media Resource Access Control 399
Figure 15-20 shows a media resource management scenario based on arbitrary values for
learning purposes.
Figure 15-20 Media Resource Management Example
The five conference bridges in Figure 15-20 have the following capabilities:
■ HW_CFB_1: 2 conference capacity
■ HW_CFB_2: 1 conference capacity
■ SW_CFB_1: 1 conference capacity
■ SW_CFB_2: 1 conference capacity
■ SW_CFB_3: 1 conference capacity
The following media resource groups have been configured:
■ MRG_HW-CFB: HW_CFB_1 and HW_CFB_2
■ MRG_SW-CFB: SW_CFB_1 and SW_CFB_2
■ SW_CFB_3: Not assigned to an MRG
The MRGL of MRGL_CFB has MRG_HW-CFB configured as first priority and
MRG_SW-CFB listed as second priority.
Conf. 1
HW_CFB_1
(Default - no MRG)
SW_CFB_3 (1 conf.)
MRGL CFB
1. MRG HW_CFB
2. MRG SW_CFB
IP
Conf. 2
HW_CFB_2
IP
Conf. 3
HW_CFB_1
IP
Conf. 4
SW_CFB_1
IP
Conf. 5
SW_CFB_2
IP
Conf. 6
SW_CFB_3
IP
MRG HW-CFB
HW_CFB_1 (2 conf.)
HW_CFB_2 (1 conf.)
SW_CFB_1 (1 conf.)
SW_CFB_2 (1 conf.)
MRG SW-CFB
400 Chapter 15: Media Resources
Assume that six conferences are established from devices that all use the MRGL_CFB
MRGL. The conference bridges will be allocated in the following way:
■ The first conference uses conference bridge HW_CFB_1. The second conference uses
conference bridge HW_CFB_2, because the resources within an MRG are load shared
and not used in the configured order. The third conference uses HW_CFB_1 again
because there are available resources available in that conference bridge resource.
■ The fourth conference uses a resource in the second media resource group because the
first is out of resources. The fourth conference uses SW_CFB_1, and the fifth
conference uses SW_CFB_2.
■ The sixth conference does not find a free resource in either MRG, but it finds
SW_CFB_3 in the default list. Resources not assigned to a media resource group can
be used by any device.
Three configuration steps are required to configure media resource access control:
Step 1 Configure the MRGs.
Step 2 Configure the MRGLs.
Step 3 Assign the MRGLs to phones.
To add an MRG, navigate to Media Resources > Media Resource Group in CUCM
Administration. At the Media Resource Group Configuration window, enter a name and
description for the MRG and add the desired media resources to the MRG. An MRG
configuration is illustrated in Figure 15-21.
To add an MRGL, navigate to Media Resources > Media Resource Group List in CUCM
Administration. At the Media Resource Group List Configuration window, enter a name for
the MRGL and add the desired MRG to the MRGL.
Because the order of MRGs within a MRGL specifies the priorities of the MRG, it is
important to list the MRGs in the desired order. In Figure 15-22, hardware conference
bridges should be used before software conference bridges.
Media Resource Access Control 401
Figure 15-21 Media Resource Group Configuration
Figure 15-22 Media Resource Group List Configuration
402 Chapter 15: Media Resources
MRGLs can be assigned to devices (phones, trunks, or gateways) or to device pools. In
Figure 15-23, an MRGL is assigned directly to an IP phone. If the device pool associated
with the phone has a different MRGL, the phone configuration overrides the device pool
inheritance.