Messages in the CCM trace that start with ‘StationD’ refer to messages ________.

A.
To an IP phone.

B.
From StationInit

C.
From an IP Phone

D.
To and from an IP Phone

Explanation:
StationDmessages are sent from CCM to the phone.
StationInit messages are sent from the phone to CCM. Reference:Cisco Press book, Troubleshooting Cisco IP Telephony, Page 52.
ISBN: 1-58705-075-7
Cisco CallManager Intra-Cluster Call Flow Traces
The following SDI traces explore the intra-cluster call flow in detail. 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
http://www.cisco.com/en/US/partner/products/sw/voicesw/ps556/prod_troubleshooting_guide_chapter09186a0