0x01 Report Call Processing Event

Used in:
Inseize Control message

ICB Type | 0x01 (Action)
ICB ID | 0x01 or 0x04 Report Call Processing Event
Data Length | 0x02 (for Digits event) 0x01 (for all other events) .
Data[0] | Call Processing Event 0x00 No Event 0x01 Off-hook 0x02 Digits 0x03 Wink 1 0x04 Wink 2 0x05 Wink 3 0x06 Wink 4 0x07 Wink 5 0x08 Wink 6 0x09 Wink 7 0x0A Wink 8 0x0B Dial Tone 0x0C Reserved All other events are reserved and must be 0x00.
Data[1] | Stage Numbers This field applies only when the Call Processing Event is Digits (0x02). This field is a bit mask. You can report multiple stages at the same time. Valid entries for the bits of this field range are as follows: Bit 0 Stage 1 1 Stage 2 2 Stage 3 3 Stage 4 Bits 4-7 are reserved and must be 0x00.

See Information Control Block.
In PPL, a condition that, when met, drives a state machine (PPL Component) from one state to another, by invoking an associated Primitive. In PPL files, an Event is marked by an arrow and text.
Momentary interruption in a single frequency tone indicating the distant switch is ready to receive the digits just dialed.