Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)
© 2000 Cisco Systems, Inc.
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16:03:02.328 CCM|MediaTerminationPointControl - stationOutputKeepAliveAck tcpHandle=4fa7dc0
16:03:02.328 CCM|UnicastBridgeControl - stationOutputKeepAliveAck tcpHandle=4bf8a70
16:03:06.703 CCM|StationInit - InboundStim - IpPortMessageID: 32715(0x7fcb) tcpHandle=0x4fbbc30
16:03:06.703 CCM|StationD - stationOutputKeepAliveAck tcpHandle=0x4fbbc30
Cisco CallManager Intra-Cluster Call Flow Traces
The following SDI traces explore in detail the intra-cluster call flow. The Cisco IP Phones in the
call flow can be identified by the directory number (dn), tcpHandle, and IP address. A
Cisco IP Phone (dn: 1001, tcpHandle:
0x4fbbc30, IP address:
172.16.70.231) located in Cluster 2
is calling another Cisco IP Phone in the same Cluster (dn=1000, tcpHandle=
0x4fbb150, IP
address=
172.16.70.230). Remember that you can follow a device through the trace by looking at
the TCP handle value, time stamp, or name of the device. The TCP handle value for the device
remains the same until the device is rebooted or goes offline.
The following traces show that the Cisco IP Phone (1001) has gone off-hook. The trace below
shows the unique messages, TCP handle, and the called number, which are displayed on the
Cisco IP Phone. There is no calling number at this point, because the user has not tried to dial
any digits. The information below is in the form of Skinny Station messages between the Cisco
IP Phones and the Cisco CallManager.
16:05:41.625 CCM|StationInit - InboundStim - OffHookMessageID tcpHandle=0x4fbbc30
16:05:41.625 CCM|StationD - stationOutputDisplayText tcpHandle=0x4fbbc30, Display= 1001
The next trace shows Skinny Station messages going from Cisco CallManager to a
Cisco IP Phone. The first message is to turn on the lamp on the calling party’s Cisco IP Phone.
16:05:41.625 CCM|StationD - stationOutputSetLamp stim: 9=Line instance=1 lampMode=LampOn
tcpHandle=0x4fbbc30
The stationOutputCallState message is used by Cisco CallManager to notify the station of certain
call related information.
16:05:41.625 CCM|StationD - stationOutputCallState tcpHandle=0x4fbbc30
The stationOutputDisplayPromptStatus message is used by Cisco CallManager to cause a call-
related prompt message to be displayed on the Cisco IP Phone.
16:05:41.625 CCM|StationD - stationOutputDisplayPromptStatus tcpHandle=0x4fbbc30
The stationOutputSelectSoftKey message is used by Cisco CallManager to cause the Skinny
Station to select a specific set of soft keys.
16:05:41.625 CCM|StationD - stationOutputSelectSoftKeys tcpHandle=0x4fbbc30
The next message is used by Cisco CallManager to instruct the Skinny Station as to the correct
line context for the display.
16:05:41.625 CCM|StationD - stationOutputActivateCallPlane tcpHandle=0x4fbbc30
