Which two SCCP call signaling messages are sent by an IP phone to Cisco Unified
Communications Manager? (Choose two.)

A.
SoftKeyEvent

B.
OpenReceiveChannelAck

C.
StartMediaTransmission

D.
SelectSoftKeys

E.
CloseReceiveChannel

F.
StopTone

Explanation:
This message indicates which soft key was pressed. Upon receipt of this
mesage,CallManager invokesthe action associated with thepressed soft key. For example,
ifHoldwas the pressed soft key,CallManager places the active call on user hold.In some trace files
you might see a soft key number without the corresponding description. The following list defines
each soft key number.