NEC Univerge SV9100 - Receiving Off-Hook Signaling on a Single Line Telephone

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Receiving Off-Hook Signaling on a single line telephone while engaged on an internal or external
call:
1. When Off-Hook Signaling is heard in the receiver, press the Flash Key to answer the call. The
first call is placed on hold.
2. Press the Flash Key again to toggle between the two calls.
 If the single line phone hangs up with the active call, the other call on hold rings back to the single
line.