Plantronics Calisto Pro Series - Manual (Page 28)

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Receiving a second incoming call
Note: To receive a second incoming call, you must subscribe to call waiting
from your phone service provider.
While you are on a landline or mobile call, the headset emits 3 beeps
to inform you that there is a second incoming landline or mobile call.
Since the Calisto phone does not control your mobile phone, you
cannot toggle back and forth between landline (or VoIP) and mobile
calls. In order to switch from a landline call to an incoming mobile call
or from a mobile call to an incoming landline call, you will have to end
the first call.
If you are on
this type of
call: And this
type of call
comes in:
Do the following:
Landline
(or VoIP*) Landline
(or VoIP)
Press either Talk/Flash or Answer
(right soft key) on the screen to answer the
incoming call.
Switch back and forth between calls using
Talk/Flash
or the onscreen options.
Landline
(or VoIP) Mobile
Press the Headset button once to hang up
the landline call and a second time to answer
the incoming mobile call.
Mobile Landline
(or VoIP)
Press the Headset button once to hang up
the mobile call and a second time to answer the
incoming landline call.
*When you are on a VoIP call, a second incoming VoIP call does not ring but is instead sent directly to
the VoIP voicemail service.
Tips for mobile calls
If you are using the headset on a mobile call, you can answer the incoming
landline or VoIP call on your headset without ending the mobile call by
transferring the first call back to the mobile phone handset. Press and hold
the
Headset button for  seconds to transfer the mobile call back to your
mobile handset.
If you are using the headset on a landline or VoIP call, you can answer
the incoming mobile call on your headset without ending the landline
or VoIP call by transferring the call back to your Calisto handset. Press
the
Speakerphone or Handset key. You can now answer the
incoming mobile call on your headset.
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