Vertical Communications DXP Series - Manual (Page 13)

1.3 Using Your Speakerphone
When using your speakerphone, the microphone and loudspeaker are
farther away from you than when you use a handset. Both the signal from
the loudspeaker and the signal to the microphone must be strengthened.
When microphones and loudspeakers are close together (such as in a
speakerphone), additional amplification typically generates a ringing
sound (public address systems do this if the volume is too high or the
microphone is too close to a loudspeaker).
NOTE: The 8324F-** speakerphone can function in the full-duplex or
half-duplex mode. Both sets of guidelines (section 1.3.1 and
section 1.3.2) are applicable to the 8324F-**.
The 8012S-**, 8024S-**, 8324S-**, and 8312S-**
speakerphones only function in the half-duplex mode—only
section 1.3.2, Speakerphone User Guidelines, apply to these
telephones.
1.3.1 Using A Full-Duplex Speakerphone
The Impact SCS 8324F-** speakerphone uses the latest full-duplex
speakerphone technology. (Full-duplex technology enables both parties
on a speakerphone call to speak simultaneously—half duplex
speakerphones allow only one person to speak at a time.) The 8324F-**
will operate in either full-duplex or half-duplex mode depending on the
current line conditions. For example, satellite calls or calls with a delay
involved may prevent the telephone from operating in full-duplex mode.
At the beginning of each call, the telephone must perform a “speech
training” test. To achieve optimum performance from the full-duplex
speakerphone, Comdial recommends that each user in turn speak about
10 consecutive words to allow the telephone to “train” itself. Note that
during the “speech training” test, the speakerphone is operating in
half-duplex mode.
Depending on the telephone line conditions and the type of speakerphone
at the other end, it may not be possible for the 8324F-** to operate in
full-duplex mode. If the speakerphone at the other end is a half-duplex
speakerphone and both parties are in speakerphone mode, the half-duplex
speakerphone is the controlling factor, preventing the 8324F-** from
operating in full-duplex mode.
NOTE: Pressing any button (mute, hold, etc.) on the speakerphone
while in full-duplex mode causes the system to perform the
“speech training” test again. For example, if you press MUTE
while in full-duplex mode, when you release the call from
mute, the system will perform the entire “speech training” test
again.
GCA70–258 Introducing The Telephone
LCD Speakerphone Station User's Guide 1 – 7