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Unlock station by PIN code (Node-RED)

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Functional description

This article explains how to configure a predefined group of intercom stations so that they remain locked while idle and can be temporarily unlocked by entering a PIN code.

When a user dials the PIN code (which is implemented as an Event Trigger number), the system unlocks the station for a specified duration. After this period expires, the station automatically returns to its locked state.

Example: The user dials 8951 + 106 to unlock his station and place a call to number 106.

Configuration

This application is based on a premade Node-RED flow.

Preparations

Node configuration

Call Handling flow:

Call Handling flow

With reference to the above imported flow:

  • Node 1 (Zenitel Call State Event): This node receives information about all calls in the system. The only configuration required is to assign the ZCP Link.
  • Node 2 (Exclude from dirno range):
  • Node 3 (Exclude to dirno range):
  • Node 4 (Exclude PIN code):
  • Node 5 (Check for locked station):
  • Node 6 (Zenitel Call End): If the call is not authorized this node will send a command to ZCP to cancel the call immediately after it is established. The only configuration required is to assign the ZCP Link.

Event Trigger flow:

Set "Unlock" state by dialing an Event Trigger

With reference to the above imported flow:

  • Node 1 (Zenitel Event Trigger Event): In the Eventno field enter the Event trigger number to be used as PIN code (e.g. 8951). Assign the ZCP Link.
  • Node 2 (Unlock station):
  • Node 3 (Delay 30s):
  • Node 4 (Lock station):


Test and confirm operation

When the PIN code (e.g., 8951) is entered:

  • The variable xxxxxx is set to yyyyyy (station becomes unlocked)
  • After the configured timeout (e.g., 30 seconds), the variable xxxxxx is reset to zzzzz (station locks again)

While the station is unlocked, and the user dials another number, the flow will verify:

  1. Whether the calling station is excluded from PIN requirements
  2. Whether the called number is excluded from PIN requirements
  3. Whether the called number is the actual PIN code itself (if so, this is always permitted)
  4. If
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