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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Cisco Systems 30 VIP manual Sample Topology, Call Flow Traces
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30 VIP specifications

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