Again. to mute the microphone press, Key does not have to be pressed for, A call, press – Polycom 500D User Manual
Page 13: Then press, Instead of the second, Mute, Redial, On/off, Transfer, Shift

SoundStation Premier
Installation Instructions and User's Guide
7
VOL
RINGER VOL
HOLD
THIS PHONE #
ON/OFF
B
A
C
E
D F
N
M
O
K
J L
H
G I
U
T V
PQ
RS
W
XYZ
REDIAL
CONF
MUTE
SHIFT
TRANSFER
VOL
RINGER VOL
HOLD
THIS PHONE #
ON/OFF
B
A
C
E
D F
N
M
O
K
J L
H
G I
U
T V
PQ
RS
W
XYZ
REDIAL
CONF
MUTE
SHIFT
TRANSFER
To shut off the microphones while
keeping the speaker on, press
MUTE
.
This shuts off all microphones including
extended microphones, if installed.
The display will show MUTE and
the LEDs will turn from green to red.
To take the call off MUTE, press
MUTE
again.
To Mute the Microphone
Press
REDIAL
. The display on the main
keypad will show the last phone number
which you called or attempted to call.
The
ON/OFF
key does not have to be
pressed for
REDIAL
to initiate a call.
To Redial the Last Phone Number Called
Your 500D/550D Interface Module is
equipped with an RCA jack labeled
AUX I/O to accommodate either your
Polycom Lapel Microphone (available as
an accessory), or to record a conversation.
To record, plug one end of an RCA-type
connector into the jack on a tape recorder
labeled AUX IN and the other end into the
500D/550D Interface Module.
Using an Optional Lapel Mic or Recording Device
AUX I/O
To
TRANSFER
a call, press
SHIFT
then press
REDIAL
. At the dial tone,
dial the extension to which the call is
being transferred. Press
REDIAL
again to
complete the transfer, either when you
hear ringing or after talking privately with
the person to whom the call is being
transferred. To cancel a transfer attempt
press
ON/OFF
, instead of the second
REDIAL
press, anytime during the attempt.
While dialing, the extension will show
on the display. The display will revert
to its previous mode after the transfer is
completed or cancelled.
Note: Since the conference phone is a
single line phone, all conferenced parties
will be transferred when this function is
used
To Transfer a Call
VOL
RINGER VOL
HOLD
THIS PHONE #
ON/OFF
B
A
C
E
D F
N
M
O
K
J L
H
G I
U
T V
PQ
RS
W
XYZ
REDIAL
CONF
MUTE
SHIFT
TRANSFER