Reserve Trunk
If this feature is configured (contact System Support), you can reserve a busy trunk for your own use.
When the trunk is free, you receive a call.

Step by Step
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Lift the handset.
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Enter the external code. The external trunk is busy; you hear a busy signal tone. Wait about 5 seconds until the busy tone ends. The trunk is reserved.
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Replace the handset.
When the reserved trunk becomes free:
Your telephone rings.
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Lift the handset. You hear the CO dial tone.
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Enter the number of the external station.
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