Cisco Systems 30 VIP manual MTP Resource Problems

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Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)

Assume Cisco CallManager has been configured such that between Region1 and Region2, the codec is G.729. The following scenarios are possible:

∙If caller on Phone A initiates a call, Cisco CallManager realizes it is a

Cisco IP Phone 7960, which happens to support G.729. After the digits have been collected, the Cisco CallManager determines that the call is destined for User D who is in Region2. Since the destination device also supports G.729, the call is set up and the audio flows directly between Phone A and Phone D.

∙If a caller on Phone B, who has a Cisco IP Phone 12SP+, were to initiate a call to Phone D, then this time the Cisco CallManager would realize that the originating phone only supports G.723 or G.711. Cisco CallManager would need to allocate a transcoding resource so that audio would flow as G.711 between Phone B and the transcoder, but as G.729 between the transcoder and Phone D. If no transcoder were available, Phone D’s phone would ring, but as soon as the call was answered, the call would disconnect.

∙If a user on Phone B were to call Phone F (Cisco IP Phone 12SP+), the two phones would actually use G.723, even though G.729 is configured as the codec to use between the regions. G.723 is used because both endpoints support it and it uses less bandwidth than G.729.

∙If a Cisco uOne voicemail system is added (which only supports G.711) or a

Cisco IOS router configured for G.711 to Region1, then a transcoding device must be used if calling from Region2. If none is available, then the call will fail.

MTP Resource Problems

An MTP resource problem could be the culprit if a call is established, but supplementary services are not available on an H.323 device that does not support H323v2. First, determine whether you have any available MTP resources (either software or hardware) registered with

Cisco CallManager. You can do so by using Microsoft Performance to check the number of “MediaTermPointsAvailable.”

One MTP software application supports 24 calls (using MTP to support supplementary services with H.323 devices that not support H.323v2), as shown in the following trace.

10:12:19.161 Cisco CallManagerMediaTerminationPointControl - Capabilities Received - Device= MTP_kirribilli. - Registered - Supports 24 calls

One E1 port (WS-X6608-E1 card contains 8x E1 ports) provides MTP resources for 16 calls, as shown in the following trace.

11:51:09.939 Cisco CallManagerMediaTerminationPointControl - Capabilities Received - Device= MTP00107B000FB1 - Registered - Supports 16 calls

The following hardware trace from the Cisco Catalyst 6000 8 Port Voice T1/E1 and Services Module, indicates that the E1 port 4/2 in the card has registered as an MTP/transcoder with Cisco CallManager.

© 2000 Cisco Systems, Inc.

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Contents SDI Trace Output Configuring Traces Reorder Tone Through Gateways Gateway Registration Problems Page Purpose Documentation Checklist Codec Channel Acronym/Term Cnf Law mu-lawChannel Calling Search Space CCAPi Cisco IOS ClusterPartition Flow Full duplex 711 729 225 245 323 Half Duplex HookflashJitter Law mu-law Silence Suppression Voice Activation Detection 931Route Filter Route Group Route List Route Pattern Voice Activation Detection Silence Suppression VoIP Translation PatternCisco CallManager Administration Details View Report Microsoft PerformanceMicrosoft Event Viewer SDI Trace Configuring Traces SDL Trace Page SDLTraceDataFlag Value SDLTraceTypeFlag Value DefinitionCall Detail Records CDR and Call Management Records CMR Sniffer TraceSelect Service Service Parameters CDRs Voice Quality Problem CategoriesPage Packet Number Time absolute ms Time delta ms Button Help John Check Your Loads Phone Resets Dropped Calls Page Page Cisco CallManager Feature Issues Locations Conf Bridge Region1 Region2 MTP Resource Problems MTP Dial Plans Dialing DOES-NOT-EXIST Page DialPlanWizardG Clause NamePattern Device Name Device Description Usage Pattern PartitionReorder Tone Through Gateways Slow Server ResponseGateway Registration Problems Module.port CFG Booting Dhcp for dynamic configurationTracyclose mod port tracystart mod port TaskID Cmd show dhcp Gmsg ***TFTP Error File Not Found Gmsg CCM#0 CPEvent = Loadid -- CPState = LoadResponse Gatekeeper ProblemsRegistration Rejects RRJ Cisco IP Phone Initialization Process Sample TopologyPage Skinny Station Registration Process Acknowledge Station ResetMessage Description Station Register Station IP PortPage Cisco CallManager Initialization Process Self-Starting Processes Cisco CallManager Registration Process Cisco CallManager KeepAlive Process Cisco CallManager Intra-Cluster Call Flow Traces Cisco Systems, Inc CCMStationD stationOutputStopTone tcpHandle=0x4fbbc30 Cisco Systems, Inc Call Flow Traces Page Cisco Systems, Inc Following debug messages show that the call is in progress Gatekeeper Endpoint Registration Debug Messages and Show Commands on the Cisco IOS GatewayCisco Systems, Inc Page Cisco IOS Gateway with T1/PRI Interface Cisco IOS Gateway with T1/CAS Interface Cisco Systems, Inc Inter-Cluster H.323 Communication Call Flow Traces Failed Call Flow Cisco Systems, Inc Reading Records Writing RecordsRemoving Records Table SchemaFields in a Call Detail Record Known IssuesDeciphering the Time Stamp Originator’s node ID Global Call IdentifierOrigination leg call identifier Date/time of call originationPort for the originator’s media connection Isdn location valueCalling party cause Of call termination IP address for the originator’s media connectionCalled party’s partition Destination span or portIP address to which the call was delivered unsigned integer IP port to which the call was deliveredDate/time of disconnect unsigned integer IP address for the destination outgoing media connectionCodec type used by the destination on sending side Date/time of connectDirectory number used on this call Global Call Identifier for this callCisco CallManager node identifier Call IdentifierLatency experienced during this connection Lost RTP packets during this connectionInterarrival jitter during this connection Normal Calls Cisco IP Phone-to-Cisco IP Phone Call Management Records Logged By Call Type Codec Cause Codes Description Codec Types Compression / Payload typesNumber changed Alarms Calling Cisco Technical Assistance Center TAC Index Debug messages and show commands Page Topology

30 VIP specifications

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