Cisco Systems OL-9420-01 IP Phone User Manual


  Open as PDF
of 12
 
B-1
Troubleshooting Guide for Cisco Unified CallManager Release 5.0(2)
OL-9420-01
APPENDIX
B
Case Study: Troubleshooting
Cisco Unified IP Phone Calls
This appendix contains two case studies:
• Troubleshooting Intracluster Cisco Unified IP Phone Calls
• Troubleshooting Intercluster Cisco Unified IP Phone Calls
Troubleshooting Intracluster Cisco Unified IP Phone Calls
The case study in this section discusses in detail the call flow between two Cisco Unified IP Phones
within a cluster, called an intracluster call. This case study also focuses on Cisco Unified CallManager
and Cisco Unified IP Phone initialization, registration, and keepalive processes. A detailed explanation
of an intracluster call flow follows the discussion. The explanation of the processes are explained using
the trace utilities and tools discussed in Chapter 2, “Troubleshooting Tools.”
This section contains the following topics:
• Sample Topology
• Cisco Unified IP Phone Initialization Process
• Cisco Unified CallManager Initialization Process
• Self-Starting Processes
• Cisco Unified CallManager Registration Process
• Cisco Unified CallManager KeepAlive Process
• Cisco Unified CallManager Intracluster Call Flow Traces
Sample Topology
Given that you have two clusters named Cluster 1 and Cluster 2, the two Cisco Unified CallManagers in
Cluster 1 are called Unified CM3 and Unified CM4, while the two Cisco Unified CallManagers in
Cluster 2 are called Unified CM1 and Unified CM2.
The traces collected for this case study come from Unified CM1, which is located in Cluster 2, as shown
in Figure B-1. The basis for the call flow are the two Cisco Unified IP Phones in Cluster 2. The IP
addresses of these two Cisco IP Phones are 172.16.70.230 (directory number 1000) and 172.16.70.231
(directory number 1001), respectively.
next