0x01

Continuity indication in IAM. (NOTE: The host also receives a DS0 status change as the channel is automatically brought OOS to perform the continuity test.)

0x02

Continuity Check Incoming Success

0x03

Continuity Check Incoming Failure

0x04

T8 expiration

0x05

REL received while waiting for Continuity Check

0x06

Alert Maintenance=No RLC received before T5 expiration

0x07

Continuity Check Outgoing Success

0x08

Continuity Check Outgoing Failure

0x09

Extra USR message received in UUS2

0x0B

Invalid PAM request received from host

0x0C

Only user-initiated SUS accepted

0x0D

Suspended from terminating side, but received resume from originating side

0x0E

Suspended from originating side but received resume from terminating side

0x0F

Only user-initiated RES accepted

0x11

Max USR messages sent

0x12

T39 expiry

0x13

RES not received OPR timeout

0x14

Maximum number of UPT retries completed without response

0x17

Discarded message with unrecognized parameters

0x20

FAR received

0x21

FAA received

0x22

FRJ received

0x23

USR received

0x24

FAC received

0x25

PAM received

0x26

NRM received

0x27

CRG received

0x28

IDR received

0x29

IRS received

0x2A

INR received

0x2B

INF received

0x2F

SUS received

0x30

RES received

0x32

SAM received

0x34

UPA received

0x38

FOT received

0x39

DRS received

0x3A

TDRS expiry

0x41

MPM received indication

0x42

CCL received indication

0x43

OPR received

0x44

OPR resume received

0x45

UPT message indication

0x49

CMC received

0x4A

CMRJ received

0x4B

CMR received

0x4C

TCMR expiry

0x4D

In call modification not allowed

0x4E

Parameter discarded

0x4F

Indication with data for CCR

0x50

Indication with data for LPA

0x55

Loop Prevention (LOP).

0x99

T9 expiration

0x9A

T7 expiration