Lucent Technologies Release 7 Incoming Call, Direct Inward Dialing (DID)

DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4 June 1999
Maintenance Object Repair Procedures
9-531DIOD-TRK (DIOD Trunk)
9
2. PBX On-Hook (Drop Message): Open Tip-Ring loop, no loop current CO
Response: CO goes to idle state (see Note)
Incoming Call
1. CO Applies Ringing Voltage PBX Response: Detect ringing current
2. PBX Off-Hook (Answer Message): Close loop CO Response: Trip ringing,
provide loop c urrent
3. PBX On-Hook (Drop Message): Open Tip-Ring loop, no loop current CO
Response: CO goes to idle state (see Note)
Direct Inward Dialing (DID)
1. CO Applies Ringing Voltage
PBX Response: Detect ringing current and close loop
CO Response: Send DTMF digits
PBX Response: Acknowledge of Number d ialed and open loop
2. PBX Off-Hook (Answer Message): Close loop CO Response: Trip ringing,
provide loop c urrent
3. PBX On-Hook (Drop Message): Open Tip-Ring loop, no loop current CO
Response: CO goes to idle state (see Note)
NOTE:
CO does not normally provid e an On-Hook (Disconnect) sig nal.