Cisco MCS-7825-H3-IPC1, Руководство по обслуживанию

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Cisco Unified Communications Manager Managed Services Guide
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Chapter 6 Cisco Unified Serviceability Alarms and CiscoLog Messages
Warning-Level Alarms
The MOH allocation can also fail due to codec mismatch or capability mismatch between the endpoint
and the MOH server. If there is a codec mismatch or capability mismatch (such as the endpoint using
IPv6 addressing but MOH server supporting only IPv4), an MTP or transcoder should be allocated. If
the MTP or transcoder is not allocated then either MediaResourceListExhausted (with Media Resource
Type as Media termination point or transcoder) or MtpNoMoreResourcesAvailable alarm will be
generated for the same Media Resource Group List and you should first concentrate on that alarm.
The MOH allocation may even fail after checking the region bandwidth between the regions to which
the held party belongs and the region to which the MOH server belongs. Increasing the region bandwidth
may be a solution to the problem, but that decision should be made after careful consideration of the
amount of bandwidth you're willing to allocate per call between the set of regions.
You'll need to weigh different factors such as the total amount of available bandwidth, the average
number of calls, the average number of calls using the MOH servers, approximate bandwidth use per
call, and so on, and accordingly calculate the region bandwidth. Another possible cause is that the
bandwidth needed for the call may not be available. This can occur if the MOH server and endpoint
belong to different locations and the bandwidth that is set between the locations is already in use by other
calls.
Examine the bandwidth requirements in your deployment to determine whether bandwidth between the
locations can be increased. However, please note that increasing the bandwidth between these two
locations means that you may need to reduce the bandwidth between other locations.
Refer to the System Guide, SRNDs, and related Unified CM documentation for more details. Be aware
that reducing the bandwidth or removing the higher bandwidth codecs from configuration may result in
poor voice quality during call. Consider increasing the total amount of network bandwidth. Another
reason for the MOH allocation failure may be due to meeting the maximum number of unicast or
multicast streams supported by the MOH server.
If all available streams are already in use, none can be allocated. Finally, check the Music On Hold Audio
Source Configuration window in Cisco Unified CM Administration to confirm that at least one audio
source is configured. If an audio source is not configured, upload an audio file and then configure the
audio source in Cisco Unified CM Administration (refer to the Music On Hold configuration
documentation for specific details).
MtpNoMoreResourcesAvailable
Media termination point or transcoder allocation failed.
The alarm occurs when allocation of a media termination point (MTP) or transcoder fails for all the
registered MTPs or transcoders belonging to the Media Resource Group List and Default List. Each MTP
or transcoder may fail for different reasons. Following are some of the reasons that could cause an MTP
or transcoder allocation to fail: a capability mismatch between the device endpoint and MTP/transcoder,
codec mismatch between the endpoint and the MTP/transcoder; a lack of available bandwidth between
the endpoint and the MTP/transcoder; or because the MTP/transcoders resources are already in use.
A capability mismatch may be due to the MTP/transcoder not supporting one or more of the required
capabilities for the call such as Transfer Relay Point (which is needed for QoS or firewall traversal), RFC
2833 DTMF (which is necessary when one side of the call does not support RFC 2833 format for
transmitting DTMF digits and the other side must receive the DTMF digits in RFC2833 format, resulting
in conversion of the DTMF digits), RFC 2833 DTMF passthrough (in this case, the MTP or transcoder
does not need to convert the DTMF digits from one format to another format but it needs to receive
DTMF digits from one endpoint and transmit them to the other endpoint without performing any
modifications), passthrough (where no codec conversion will occur, meaning the media device will
receive media streams in any codec format and transmit them to the other side without performing any
codec conversion), IPv4 to IPv6 conversion (when one side of the call supports only IPv4 and the other