Cisco Systems 30 VIP manual Sample Topology, Inter-Cluster H.323 Communication

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

Appendix C – Troubleshooting Case Study 3

Inter-Cluster Cisco IP Phone-to-Cisco IP Phone Calls

In the previous case studies, the call flow and troubleshooting techniques of an intra-cluster call and a Cisco IP Phone call through a Cisco IOS Gateway to a phone hanging off of a local PBX or somewhere on the PSTN have been discussed in detail. This case study examines a

Cisco IP Phone calling another Cisco IP Phone located in a different cluster. This type of call is also known as an inter-cluster Cisco IP Phone call.

Sample Topology

The following is the sample topology is used in this case study. There are two clusters, each having two Cisco CallManagers. There are also Cisco IOS Gateways and a

Cisco IOS Gatekeeper in place.

Inter-Cluster H.323 Communication

As you can see in the topology, the Cisco IP Phone in Cluster 1 is making a call to the

Cisco IP Phone in Cluster 2. Inter-cluster Cisco CallManager communication takes place using the H.323 Version 2 protocol. There is also a Cisco IOS Gatekeeper for admission control. The detailed explanation of the debug output and show commands, and the interaction between the Cisco IOS Gatekeeper and Cisco IOS Gateway and Cisco CallManager devices can be reviewed in the previous sections.

The call flow process is shown in the diagram below. The Cisco IP Phone can talk to the Cisco CallManager via Skinny Station protocol, and the Cisco CallManager can talk with the Cisco IOS Gatekeeper using the H.323 RAS protocol. The Admission Request message (ARQ)

is sent to the Cisco IOS Gatekeeper, which sends the Admission Confirmed message (ACF) after

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Contents SDI Trace Output Configuring Traces Reorder Tone Through Gateways Gateway Registration Problems Page Purpose Documentation Checklist Channel Calling Search Space CCAPi Acronym/Term Cnf Law mu-lawCisco IOS Cluster Codec ChannelJitter Law mu-law Flow Full duplex 711 729 225 245 323 Half Duplex HookflashPartition Route Filter Route Group Route List Route Pattern 931Silence Suppression Voice Activation Detection 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 Message Description Station Register Station ResetStation IP Port AcknowledgePage 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 Origination leg call identifier Global Call IdentifierDate/time of call origination Originator’s node IDCalling party cause Of call termination Isdn location valueIP address for the originator’s media connection Port for the originator’s media connectionIP address to which the call was delivered unsigned integer Destination span or portIP port to which the call was delivered Called party’s partitionCodec type used by the destination on sending side IP address for the destination outgoing media connectionDate/time of connect Date/time of disconnect unsigned integerCisco CallManager node identifier Global Call Identifier for this callCall Identifier Directory number used on this callInterarrival jitter during this connection Lost RTP packets during this connectionLatency experienced 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