Avaya 03-300430 User Manual

1. PBX Off-Hook (Seize Message): Closes the Tip-Ring Loop CO Response: DC loop current 

+ Dial tone

2. PBX On-Hook (Drop Message): Open Tip-Ring loop, no loop current CO Response: CO 

goes to idle state (see Note)

1. CO Applies Ringing Voltage PBX Response: Detect ringing current

2. PBX Off-Hook (Answer Message): Close loop CO Response: Trip ringing, provide loop 

current

3. PBX On-Hook (Drop Message): Open Tip-Ring loop, no loop current CO Response: CO 

goes to idle state (see Note)

1. CO Applies Ringing Voltage

PBX Response: Detect ringing current and close loop

CO Response: Send DTMF digits

PBX Response: Acknowledge of Number dialed and open loop

2. PBX Off-Hook (Answer Message): Close loop CO Response: Trip ringing, provide loop 

current

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 provide an On-Hook (Disconnect) signal.

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Port Audit Update test (#36)

18

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WRN

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