Demand test descriptions and error codes - Avaya Support

● Maintenance/Far-End (MTC/FE)
This state is reached when the far end does not respond after a certain amount of time to
messages sent over the signaling link for a particular trunk. This state is different from
OOS/FE since the signaling link must have initially been up and the B-Chels in service.
The switch will periodically send messages to the far end to try to negotiate the trunk
(B-Chel) into service. The trunk is unusable for outgoing calls but will service incoming call
requests from the far end. Note that transitions into MTC/FE do not drop stable calls.
Therefore, if the service state changes from in service to MTC/FE, then stable calls are
unaffected.
● Maintenance/Near-End (MTC/NE)
The trunk (B-Chel) is in this state if the signaling chel (ISDN-PLK) is busied out by the
system technician. The trunk (B-Chel) is also temporarily in this state if the system
technician enters test trunk grp#/mem# long. This command executes the
ISDN-PRI test call. This test changes the state of the trunk member to MTC/NE for the
duration of the test unless a call request comes in from the far end. In that case, the test
would abort. Note that transitions into MTC/NE do not drop stable calls. In this state, the
B-Chel is not usable for new incoming or outgoing calls.
● Pending States
In addition to one of the previous components, the service state may have a pending
component, indicating that the switch is waiting for a reply from the far end. These service
states remain in effect until either a response is received or the allotted waiting time
expires.
- Pending-in-Service
The near end is awaiting a far-end response to a B-Chel maintenance message
requesting that a B-Chel be transitioned to in service.
The far-end has a certain amount of time to respond to the message. The service state
will be PINS until either a response is received or the timer expires.
- Pending-Maintenance
This state is supported only by systems using country protocol 1 (including US). The
near end is awaiting a far-end response to a maintenance message requesting that a
B-Chel be transitioned to the maintenance service state. The far-end has a certain
amount of time to respond to the message. The service state will be PMTC until either
a response is received or the timer expires.
● Call Activity States
The in-service state also has a call activity component.
- Active
A call is connected over the B-Chel (for example, in service active).
- Idle
There is no call currently on the B-Chel (for example, in service).
560 Maintenance Alarms for Communication Manager, Media Gateways and Servers