Cisco Systems 30 VIP manual Sample Topology, Call Flow Traces

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

Appendix B – Troubleshooting Case Study 2

Cisco IP Phone-to-Cisco IOS Gateway Calls

In the previous case study, the call flow and troubleshooting techniques of an intra-cluster call was discussed in detail. This case study examines a Cisco IP Phone calling through a

Cisco IOS Gateway to a phone hanging off of a local PBX or somewhere on the PSTN. Conceptually, when the call reaches the Cisco IOS Gateway, the gateway will forward the call either to a phone hanging off of its FXS port, or to the PBX. If the call is forwarded to the PBX, it could terminate to a phone hanging off of a local PBX or the PBX will forward it over the PSTN and the call will terminate somewhere on the PSTN.

Sample Topology

The following diagram shows the sample topology for this case study. Calls are routed through Cisco IOS Gateways and the interface to the PSTN or PBX is either T1/CAS or T1/PRI. The gateways can be models 26XX, 36XX, 53XX or 6K.

Call Flow Traces

This section discusses call flow through examples from the Cisco CallManager trace file CCM000000000. Refer to the previous section for the location of the file. The traces in this case study focus only on the call flow itself, as the more detailed trace information has already been explained in the previous case study (initialization, registration, KeepAlive mechanism, and so on).

In this call flow, a Cisco IP Phone (directory number 1001) located in the cluster 2 is calling a phone (directory number 3333) located somewhere on the PSTN. Remember that you can follow a device through the trace by looking at the TCP handle value, time stamp, or name of the

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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 ClusterFlow Full duplex 711 729 225 245 323 Half Duplex Hookflash Jitter Law mu-lawPartition 931 Route Filter Route Group Route List Route PatternSilence 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 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 IdentifierLost RTP packets during this connection Interarrival jitter 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