Справочник Пользователя для Plantronics 620-M

Is there a visual indicator on the
Calisto 620-M that shows volume
level?

No. There is no visual indication of volume level or volume
adjustments on the Calisto 620-M.

When I'm out of Calisto 620-M's
Bluetooth range while on an active
mobile phone call and then come
back into Calisto 620-M Bluetooth
range, Calisto 620-M does not
auto-reconnect to the mobile
phone/call (as it does with Voyager
Pro UC).

This is by design.
When Bluetooth mobile headsets reconnect to a mobile phone
when in-range, call privacy is not compromised because other
people cannot hear the tiny speaker in the headset, but auto
connecting on a speakerphone can compromise a private
conversation if audio is played over its loud speaker
unexpectedly.
For this reason, it is necessary to reconnect manually to Calisto
620-M from the mobile phone UI, or, to do a 2 second key press
on Calisto 620-M's Call Button to move the audio back to Calisto
620-M. This is for user conversation confidentiality.

At times I hear some clicking/
popping sounds while on a call with
Calisto 620-M, is this distortion or
some sort of a product defect?

• Bluetooth devices, like Calisto 620-M, can be susceptible to

interference from Wi-Fi and/or other Bluetooth devices.

• If you use Calisto 620-M near a Wi-Fi access point or in a

Bluetooth-intensive environment, some interference can be
experienced in the form of audible artifacts through Calisto 620-
M's speaker.

• If these artifacts are not present when using Calisto 620-M away

from Wi-Fi and/or Bluetooth- intensive environments, then it is
very likely the artifacts are caused by radio/RF interference.

Music/media played on Calisto
620-M does not sound as good
when streamed from the PC as it
does when streamed for my mobile
or smartphone. Why?

The Calisto 620-M Bluetooth adapter supports wideband audio
for both speech and media/music, so the fidelity is not as high as
music/media streamed via A2DP from a mobile/smartphone side,
which is Hi-Fi.

What size room and how many
participants does Calisto 620-M
support for group conference calls?

There are 2 variables to consider for this answer, and both
involve the perceived audio quality experiencedby listeners on
the other (far) end of a Calisto 620-M call:

The acoustic properties of the room: Not all rooms are created
equal, and room acoustics can vary significantly.

The subjective opinion (or hearing abilities) of the far-end
listener(s) which can also vary significantly

With these variables considered, in general Calisto 620-M can be
used in up to a 12x12 foot room with up to 6 participants.

Can the USB power cable be used
for audio-over-USB during calls?
Can Calisto 620-M also function as
a corded USB device?

No. The USB cable is for power and Direct Firmware Updates
(DFU) only.

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