Query on Xcoder / MTP usage

[S N]

Hi Experts,

I have a query regarding MTP and transcoder.

I have 1 2821 gateway and 1 3825 GW and 2 3845 GW configured with MTP and transcoder and registered with CUCM ( ver 8.5 )

I have added the same in MRG and MRGL and I wanted to know how the CUCM will use the MTP and transcoder .

Is it based on any priority or round robin fashion or if the first configured GWs MTP / XCD get full it hunts to the 2nd GW ?

Thanks

Sathya

[Jaime Valencia]

Best effort round robin for resources in the same MRG, then the order of MRG's the MRGL.

[Nadeem Ahmed]

(+5) for java for crips and straight answer. Here you will find your answer in detailed.

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab10/collab10/media.html#60693

Media Resource Groups and Lists

Media resource groups (MRGs) and media resource lists (MRGLs) provide a method to control how resources are allocated that could include rights to resources, location of resources, or resource type for specific applications. This section assumes you have an understanding of media resource groups and lists, and it highlights the following design considerations:

• The system defines a default media resource group that is not visible in the user interface. All resources are members of this default MRG when they are created. When using MRGs to control access to resources, it is necessary to move the resources out of the default MRG by explicitly configuring them in some other MRG. If the desired effect is for resources to be available only as a last resort for all calls, then the resources may remain in the default group. Also, if no control over resources is necessary, they may remain in the default group.
• Consumers of media resources use resources first from any media resource group (MRG) or media resource group list (MRGL) that their configuration specifies. If the required resource is not available, the default MRG is searched for the resource. For simple deployments, the default MRG alone may be used.
• Use media resource groups (MRGs) and media resource group lists (MRGLs) to provide sharing of resources across multiple Unified CMs. If you do not use MRGs and MRGLs, the resources are available to a single Unified CM only.
• MRGLs will use MRGs in the order that they are listed in the configuration. If one MRG does not have the needed resource, the next MRG is searched. If all MRGs are searched and no resource is found, the search terminates.
• Within an MRG, resources are allocated based on their order in their configuration even though Unified CM Administration displays the devices in an MRG in alphabetical order. If you want media resources to be allocated in a specific order, Cisco recommends that you create a separate MRG for each individual resource and use MRGLs to specify the order of allocation.
• When there are multiple devices providing the same type of resource within an MRG, the algorithm for allocating that resource load-balances across all those devices. Cisco Unified CM uses a throttling mechanism to load balance across MTP and transcoder resources using the MTP and Transcoder Resource Throttling Percentage service parameter, which defines a percentage of the configured number of MTP or transcoder resources. When the number of active MTP or transcoder resources is equal to or greater than the percentage that is configured for this parameter, Cisco Unified CM stops sending calls to this resource and hunts through the MRGL (including the default MRG) one time to find a resource that uses matching codecs on both sides of the call. If Cisco Unified CM cannot find an available resource with matching codecs, it returns to the top of the MRGL to repeat the search, which then includes those resources that are in a throttled state and that match a smaller subset of capabilities for the call. Cisco Unified CM extends the call to the resource that is the best match for the call when such a resource is available. The call fails when Cisco Unified CM cannot allocate a resource for the call.