Cisco Explorer 1540 Specifications download pdf (Page 437)

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Cisco Unified Communications Manager Managed Services Guide, Release 8.0(1)

OL-20105-01

Chapter 6 Cisco Unified Serviceability Alarms and CiscoLog Messages

Warning-Level Alarms

Cisco Unified Serviceability Alarm Definition Catalog

CallManager/CallManager

Severity

Warning

Parameter(s)

Media Resource List Name(String)

Recommended Action

If the MTP or transcoder allocation is failing due to a capability mismatch, it's possible that the media

device does not support the capability (such as IPv4 to IPv6 conversion, passthrough) or the capability

might not be configured in the device. Please check the user guide and documentation of the media

device to make sure that device supports all the necessary capabilities. Also, caution should be taken

care if all the MTP or transcoders are configured with all the supported capabilities.

There are certain capabilities (such as RFC 2833 DTMF or RFC 2833 DTMF passthrough or

passthrough) which could be supported by most of the MTPs or transcoders and there may be certain

capabilities (such as IPv4 to IPv6 conversion and vice versa or Transfer Relay Point or multimedia

capability) which can be supported by only by a single MTP or transcoder depending on the devices that

you have. For example, you may have IP phones that support only IPv4 protocol and there may also be

IP phones that support only IPv6 protocol.

To make a call between IPv4-only and IPv6-only phones, you need to have an MTP configured to

perform the conversion of IPv4 to IPv6 and vice versa. However, suppose all the MTPs or transcoders

are configured with all the supported capabilities and only one MTP supports IPv4 to IPv6 conversion;

if this MTP is configured with all the supported capabilities (which all the other MTPs or transcoders in

the same MRGL or default MRGL also support) it may happen that this MTP can get allocated for

Transfer Relay Point or RFC 2833 DTMF or RFC 2833 DTMF passthrough or passthrough instead. As

a result, when the need arises for IPv4 to IPv6 conversion (which other MTPs or transcoders in the same

MRGL or default MRGL do not support), all the resources of MTP may be in use and the IPv4 to IPv6

conversion may fail. To avoid this kind of problem, setting the priority of the media resources may be a

good idea.

This can be done only in the Media Resource Group List and not in the Default List of the media

resources. In any Media Resource Group List all the Media Resource Groups have different priorities;

during allocation the first Media Resource Group is always checked for availability of the requested type

of the media devices. The first Media Resource Group in the Media Resource Group List will have the

highest priority, then the second one, and so on.

To check all the Media Resource Groups and their priority go the Media Resources and Media Resource

Group List of Cisco Unified CM Administration page and click the appropriate Media Resource Group

List and check the Selected Media Resource Groups; the priority decreases from top to bottom. So, the

MTP or transcoder that you want to be selected for the most basic functionalities should be positioned

in the higher priority Media Resource Groups whereas the ones with more rare functionality should be

positioned in the Media Resource Groups with lower priority. MTP/transcoder allocation may fail due

to codec mismatch between the endpoint and the MTP/transcoder.

A solution may be to configure the MTP/transcoder with all the supported codecs (as specified in the

user guide of the MTP/transcoder), but be aware that doing so might result in too much bandwidth being

allocated for calls. You'll need to weigh different factors such as the total amount of available

bandwidth, the average number of calls, approximate bandwidth use per call (not involving

MTP/transcoder), and so on, and accordingly calculate the maximum bandwidth that can be allocated

per call involving an MTP/transcoder and take that into consideration when configuring the supported

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Cisco Explorer 1540 Specifications Page 437

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