Cisco MCS-7825-H3-IPC1 Service Manual page 506

Warning-Level Alarms
side of the call supports only IPv6 and so an MTP needs to be inserted to perform the necessary
conversion between IPv4 and IPv6 packets), or multimedia capability (if a call involving video and/or
data in addition to audio requires insertion of an MTP or transcoder then the MTP/transcoder which
supports multimedia will be inserted).
History
Cisco Unified Communications
Release
8.0(1)
Facility/Sub-Facility
CCM_CALLMANAGER-CALLMANAGER
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.
Cisco Unified Communications Manager Managed Services Guide
6-272
Chapter 6 Cisco Unified Serviceability Alarms and CiscoLog Messages
Action
• Severity changed from Error to Warning.
• Media Resource List Name parameter added.
OL-22523-01