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Is there a visual indicator on the
Calisto 620 that shows volume
level?
No. There is no visual indication of volume level or volume
adjustments on the Calisto 620.
NOTE The Calisto 620 has a mid-range default volume setting. It
provides audible indications as you adjust the volume and when you
have reached the maximum or minimum volume level.
When I'm out of Calisto 620's
Bluetooth range while on an active
mobile phone call and then come
back into Calisto 620 Bluetooth
range, Calisto 620 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 from the mobile phone UI, or, to do a 2 second key press on
Calisto 620's Call Button to move the audio back to Calisto 620.
This is for user conversation confidentiality.
At times I hear some clicking/
popping sounds while on a call with
Calisto 620, is this distortion or
some sort of a product defect?
• Bluetooth devices, like Calisto 620, can be susceptible to
interference from Wi-Fi and/or other Bluetooth devices.
• If you use Calisto 620 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's speaker.
• If these artifacts are not present when using Calisto 620 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
does not sound as good when
streamed from the PC as it does
when streamed for my mobile or
smartphone. Why?
The Calisto 620 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
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 call:
1
The acoustic properties of the room: Not all rooms are created
equal, and room acoustics can vary significantly.
2
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 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 also function as a
corded USB device?
No. The USB cable is for power and Direct Firmware Updates
(DFU) only.
NOTE An accessory cable is available from Plantronics which
emulates the corded experience; through a single USB port on the
PC, this cable provides 1) a connection for the Minimax USB
Bluetooth adapter and 2) a power connection to the speakerphone.
(PN: 86215-02)
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