Polycom VVX 1500 C Business Media Phone for Cisco Unified Communications Manager (SIP) - Manual (Page 127)

Using the Basic Features of Your Phone
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The following figure shows a call with Joan Smith on hold. The hold icon, and
the flashing red status indicator, display on the Line Key.
Tap the Resume soft key, or press again, to retrieve the call.
If you have more than one call on hold, tap the call you want to resume, and
then tap the Resume soft key. If you tap the Line Key, the first call in the
inactive call group for the Line Key will automatically resume.
Multiple Calls on Hold
Your phone displays all calls for a Line Key by displaying multiple windows
on the screen. The phone only displays the calls for one Line Key at a time.
The active call (if any) displays in a window in the center of the touch screen.
Held calls or incoming calls display in minimized windows above the phone’s
soft keys (the “inactive call group”). The Line Key associated with the
displayed calls is green. The Line Key displays a counter showing the number
of calls for the Line Key. If all the calls for a Line Key are inactive, the status
indicator for the Line Key glows red. If the Line Key has an active call, the
status indicator glows green.
Note The Hold feature typically generates music or a beeping tone. Therefore, avoid
placing a conference call on hold.