Off-hook Ringing
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Explanation
| Step 1 | Step 2 | Step 3 | Step 4 | Step 5 |
|---|---|---|---|---|
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| A talks to B | B goes on-hook, A is still off-hook, hears busy tone and phone display shows Disconnected
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After 10 seconds: display of phone A falls into idle mode and busy tone has gone |
C calls A A is still off-hook phone A rings |
A presses  key to answer the callA talks to C |
