PYLE Audio SOUNDPOINT IP 450 사용자 설명서

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User Guide for the SoundPoint IP 450 Desktop Phone
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If two phones share a line, an incoming call to that number will cause both 
phones to ring. The call can be answered on either phone but not both. 
Calls on shared lines can be transferred, put on hold, or added to a conference.
Note
Call Forwarding is not available on shared lines.
Do Not Disturb (DND) on shared lines disables the ringing option only, the visual 
indication is still in place.