Cisco MCS-7825-H3-IPC1 Service Guide - Page 506

Warning-Level Alarms Chapter 6 Cisco Unified Serviceability Alarms and CiscoLog Messages 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) Action • Severity changed from Error to Warning. • Media Resource List Name parameter added. 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. 6-272 Cisco Unified Communications Manager Managed Services Guide OL-22523-01