0x0028 V5 Subscriber ID

This ICB is used for call processing messages to and from Layer 3.

Used in:
Channel Released with Data message
Request for Service with Address Data message
PPL Event Indication message
Route Control message

ICB Type | 0x03 (Extended Data)
ICB ID Data[1, 2] | 0x0028
Data Length Data[3, 4] | (0x00, 0x04), (2 Bytes)
Data[5, 6] | V5 ID (MSB, LSB), (2 Bytes)
Data[7, 8] | V5 User Port ID (MSB, LSB), (2 Bytes)

See Information Control Block.
Protocol layer of the CSP.
See Programmable Protocol Language.
Most Significant Bit
Least Significant Bit
The point in the Excel platform where a DS0 connects to a network. Also known as a "socket."