ISUP CRCS Configuration Bytes (ITU)

Bytes 1–5 define the format of the COT message. These should not be changed.

Byte

Description

Value

0x01

Information Length

0x04

0x02

Message ID

0x05 (COT)

0x03

Parameter Count

0x01

0x04

Parameter1 ID

0x10 (Continuity Indicator)

0x05

Parameter 1 Data Length

0x00

0x06–0x09

Not Used

 

0x0A

Continuity Recheck

0x00=Enables unlimited repeated continuity checks

0x01= Limits the repeated continuity checks to n+2 times where N is the value of config byte 0x0B.

(default)

0x0B

Number of times to recheck

2 (default)

Release (REL) when COT successful

0x14

Information Length

0x06

0x15

Message ID

0x0C (REL)

0x16

Number of Parameters

0x01

0x17

Parameter 1 Data Type

0x12 (Cause Indicators)

0x18

Parameter 1 Data Length

0x02 (Cause Indicators)

0x19

Parameter 1 Data[0]

0x80 (Location=User)

0x1A

Parameter 1 Data[1]

0x90 (Cause 16=Normal Call Clearing)

Release (REL) if RLC is not received

0x1E

Information Length

0x06

0x1F

Message ID

0x0C (REL)

0x20

Number of Parameters

0x01

0x21

Parameter 1 Data Type

0x12 (Cause Indicators)

0x22

Parameter 1 Data Length

0x02 (Cause Indicators)

0x23

Parameter 2 Data [0]

0x80 (Location=User)

0x24

Parameter 1 Data[1]

0xE6 (Cause 102; Recovery on timer expiry)