Byte

Description

0, 1

Tag 0x271A

2, 3

Length Variable

4

Value[0] Coding Standard

0x00 CCITT Standardized Coding

0x01 ISO/IEC Standard

0x02 National Standard

0x03 Standard specific to identified location

5, 6

Value[1] Circuit State

0x0000 IDLE

0x0001 Locally blocked

0x0002 Remotely blocked

0x0003 Locally and remotely blocked

0x0004 Circuit incoming busy

0x0005 Circuit outgoing busy

0x0006 Locally blocked by hardware

0x0007 Remotely blocked by hardware

0x0008 Locally and remotely blocked by hardware

All other values are reserved.