Siemens 300Series 사용자 설명서

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ROLMphone 300/600 Series User Guide
Busy Standby Queuing
With Busy Standby Queuing, you can stay on a line until a busy 
extension that you are trying to call becomes free. The busy tone 
changes to music (or a ringing-beep tone), indicating that you are 
queued. As soon as the extension becomes free, your call will be put 
through automatically.
To standby queue 
for an extension
Listen for a busy tone.
Stay on the line until you hear music (or a 
ringing-beep tone). When the other party 
hangs up, the communications server will 
complete your call.
To cancel busy 
standby queuing
Hang up.