ISUP CPC PPL Event Indications (ITU)

Event ID | Event
--- | ---
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 (Raw SS7 Data Parameters ICB 0x22 included in this event indication)
0x4F | Indication with data for CCR
0x50 | Indication with data for LPA
0x55 | Loop Prevention (LOP).
0x99 | T9 expiration
0x9A | T7 expiration
0x9F | T16 expiration

Out of Service
See Signaling System Number Seven.
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.
Continuity Check Request message (ISUP)