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Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)
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Station Set Lamp (Steady)
Station Start Tone (Inside Dial Tone)
Station Keypad Button
Station Keypad Button
Station Keypad Button
Station Keypad Button
Station Start Tone (Alerting)
Station Open Receive Channel
Station Open Receive Channel Ack
Station Start Media Xmission
Station Close Receive Channel
Station Stop Media Xmission
Station Set Lamp (Off)
Cisco CallManager Initialization Process
In this section the initialization process of Cisco CallManager will be explained with the help of
traces that are captured from CCM1 (identified by the IP address 172.16.70.228). As described
previously, SDI traces are a very effective troubleshooting tool because they detail every packet
sent between endpoints. This section will describe the events that occur when Cisco CallManager
is initialized. Understanding how to read the trace helps you to properly troubleshoot the various
Cisco CallManager processes, and the effect of those processes on services such as conferencing,
call forwarding, and so on.
The following messages from the Cisco CallManager SDI trace utility show the initialization
process on one of the Cisco CallManagers, in this case, CCM1. Review the descriptions of each
message below.
The first message indicates Cisco CallManager started its initialization process.
© 2000 Cisco Systems, Inc.
Station OffHook
Station Display Text
Station Stop Tone
Station Call Info
Station Stop Tone
Station Call Info
User Information Exchange
Station On Hook
CM
Station Call Info
Station Set Lamp (Blink)
Station Set Ringer (Inside Ring)
Station Off Hook
Station Set Ringer (Off)
Station Set Lamp (Steady)
Station Open Receive Channel
Station Start Media Xmission
Station Open Receive Channel Ack
Station On Hook
Station Set Lamp (Off)
Station Close Receive Channel
Station Stop Media Xmission
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