Plantronics Calisto P820 User manual

USER GUIDE
Calisto®800 Series
P820/P825/P830/P835
Firmware version 1.19

2
ContentsContentsContents
Welcome 3
System Requirements 3
Computer 3
Connecting the Cables 4
Speakerphone and
Microphone Basics 5
Speakerphone 5
Microphone 5
Set up your speakerphone 6
Accessories 6
Set Up Your Calisto 6
Get to Know Your Calisto 8
Screen 9
Outgoing Line 10
Menu 10
Use Call Features 11
Make a Call 11
Answer or Ignore a Call 11
Answer a Second Incoming Call 11
Switch Between Calls 12
Mute a Call 12
End a Call 12
Use Other Call Options 12
Special Features for Using Your
P830 & P835 Calisto with a Landline 13
Use the Call Log 14
Enter/Edit Favorites 15
Create a Favorite 15
Access Voicemail 19
Use Your Calisto with a Headset 20
Switch Call Audio Between Your
Calisto and a Headset 20
Use Your Calisto with a Wireless Mic 22
Setup 22
Pairing (if not pre-paired) 22
Wearing and Use 22
Features 23
Wireless Mic Usage 24
Light Indicators 25
Disconnect from/Reconnect to a Mobile Phone
or Bluetooth Headset 26
Customize Your Calisto Settings 28
Basic Setup 28
Plantronics Spokes Software 31
Spokes Software Highlights 31
Softphone Support 31
Calisto 800 Application Support
and Features 32
Plantronics Control Panel 34
Plantronics Update Manager 35
Troubleshooting - General 36
Troubleshooting - Software 38

3
Welcome
Congratulations on purchasing your new Plantronics product. This user guide
contains instructions for setting up and using your Calisto Speakerphone
(Speakerphone + PA50 Microphone) System.
The Calisto comes in several models:
• The P820 model connects to mobile phones and PC softphones.
• The P825 model connects to mobile phones and PC softphones, and includes a PA50 wireless
mic accessory (see Use Your Calisto with a Wireless Mic on page 22).
• The P830 model connects to mobile phones, softphones, and analog landlines.
• The P835 model connects to mobile phones, softphones, analog landlines and includes a PA50
Wireless Mic accessory
The Calisto offers:
• Full duplex wideband audio with advanced noise cancellation
• A 2.4” color display and dial pad for easy caller ID viewing, dialing, answering, switching, and
muting across devices
• Support for Bluetooth and wired headsets and headphones (2 x 3.5mm jack)
• Many convenient features including integration with top Unified Communications client
applications and softphones, and media players. Please see the Plantronics Spokes Software
section for a complete list of supported features and more details
With the Calisto, you can:
• Make and answer calls for any of your connected phone lines.
• Manage and switch among multiple calls, even from different phones.
• Easily switch call audio between the built-in speakerphone, a wired headset/headphones/
earbud, or a wireless Bluetooth headset.
• Use the Call Log and Favorites to quickly view and dial numbers.
• Customize settings to make your Calisto work best for you.
Please refer to the separate safety instructions for important product safety information prior
to installation or use of the product.
System Requirements
Computer
• Supported Operating Systems: Windows XP®, Windows Vista®, Windows® 7
• Microsoft Windows XP-Service Pack 3 (SP3) or later (Recommended)
Microsoft Windows Vista-Service Pack 1 (SP1) or later (Recommended)
• Microsoft Windows 7-Service Pack 1 (SP1) or later (Recommended)

4
Connecting the Cables
*
*Landline on P830 & P835 only

Speakerphone
Microphone
5
Speakerphone and Microphone Basics
1 Analog landline telephone port (P830 & P835 models only); P820 & P825
have a standard Kenington receptacle.
2 USB port to computer
3 AC adapter (P830 & P835 models only; available as an optional accessory
for P820 & P835 models)
4Talk/End key
5Audio key. Switches from the speakerphone to a headset (or wireless mic)
and back.
6Mute key
73.5 mm headset/headphone jacks
1 Talk/End key: Press with one tap to answer or end a call. The key is green
when you have an incoming call, red when you are on a call.
2 Mute/Unmute keys: Press red key on both sides. The keys light up red
when a call is muted
1
2
3
4
5
6
7
1
2

6
Set up your speakerphone
Accessories
The following optional accessories are sold separately:
• PA50 Microphone clip: Enjoy freedom of movement and exceptional transmit quality for the
ultimate speakerphone experience (included with P825 & P835).
• Plantronics H-Top adapter cable: Connect Plantronics H-Tops with QD directly to the dual
3.5mm headset jack.
• 2.5mm-to-3.5mm adapter: Convert 2.5mm corded headsets to connect to the dual 3.5mm
headset jack.
• Headset charging cable: Charge a Plantronics Bluetooth headset with micro USB ports directly
from your Calisto
• Carrying case.
For more information on accessories, visit plantronics.com.
Set Up Your Calisto
Follow the instructions on the Calisto screen to complete setup.
The setup includes the following steps. Most steps are optional.
NOTE If you skip any part of setup, you can access the setup screens later by selecting Menu >
Settings > Advanced Setup > Setup Assistant.
Basic setup: Enter your preferred language and your country.
Language
English
Français
Español
Deutsch
Português
NEXT
If you live within the U.S. and are required to dial 10 Digits for
local calls, select “Other” as your Country setting (not “United
States”).
Area Code setup: If you select United States or Canada as
your country, enter your 3-digit landline phone area code. This
enables your Calisto to automatically add a “1,” if required, when
you dial a number from your call log (see Use the Call Log on
page 14).
If you enter an incorrect digit, press OK to delete the last digit
you entered.
Press Next (right softkey) if you do not want to enter an area
code. Note that this may result in incorrect dialing if you dial a
number from your call log.
Spokes software can be installed at anytime to enhance your
user experience with Calisto 800 and industry-leading Unified
Communications clients and softphone applications, with many
other features available.
www.plantronics.com/software
Please refer to the Plantronics Spokes Software section of this
guide for details.
NEXTBACK
Setup Assistant
The next few screens will guide
you through the setup process

7
Mobile phone setup (optional): When you connect your Calisto
to a mobile phone that supports Bluetooth, call audio from that
phone is automatically routed to your Calisto. To connect to a
mobile phone, do the following:
1 On the Mobile Phone setup screen, make sure Yes is
highlighted, and press OK .
NOTE Do not press Next/Skip (right softkey). This skips the phone
setup process.
2 Follow the onscreen instructions. If prompted, enter 0000 as
the passkey on your phone.
NOTE To access mobile phone setup later—for example, if you
want to pair with a second mobile phone—select Menu > Settings >
Bluetooth Setup.
NEXT SKIPBACK
Mobile Phone
Do you want to setup a mobile
phone to use with Calisto?
Yes(Press OK)
Bluetooth headset setup (optional): When you connect your
Calisto to a Bluetooth headset, you can route call audio to
the headset directly from your Calisto. This lets you use your
Bluetooth headset for landline, mobile, and softphone calls. To
connect to a mobile phone, do the following:
1 On the Headset setup screen, make sure Yes is highlighted,
and press OK .
NOTE Do not press Next/Skip (right softkey). This skips the phone
setup process.
2 Follow the onscreen instructions.
NOTE To access Bluetooth headset setup later, select Menu >
Settings > Bluetooth Setup .
NEXT SKIPBACK
Bluetooth Headset
Do you want to setup a Bluetooth
headset to use with Calisto?
Yes(Press OK)
FINISH
Setup Complete
You are now ready to make and
receive calls.
After setup, call audio from any phone line you have connected to your Calisto—mobile,
softphone, or analog landline (P830 & P835 models only)—is automatically routed to your
Calisto speakerphone. If you connected a headset to your Calisto, you can route the audio from
any call connect to the speakerphone from the headset and back via the Audio Key .

8
1
2
3
4
5
6
78
9
10
11
1Talk/End: Press to dial a number you entered, to answer an incoming call, or to end a call. The
key is green when you have an incoming call, red when you are on a call.
2Mute: Press to mute the currently active call. (Red when on, white when off and in a call)
3Dual 3.5mm headset/headphone/earbuds jack (on side of device): Insert headphones or earbuds
into the jack. For headsets with microphones, insert the microphone into the jack and the
speaker into the jack.
4Audio Key: Press to switch from your Calisto speakerphone to a headset or wireless mic
accessory and back. If you have more than one headset (wired or wireless) connected to your
Calisto, pressing Audio Key displays a list of all your audio options. Highlight the option you
want to switch to, and press OK When the microphone in the base is active you will see a white
LED lit on the front side of the unit. .
51 key: If you entered a voicemail access number, press and hold 1 from the Main Menu or the
Dial screen to dial it (see Enter Your Voicemail Access Number on page 29).
6Volume Up/Down: When you are on a call, press +/- to adjust the call volume. When you’re not
on a call, press +/- to adjust the ringer volume. When a call is ringing, press +/- to silence the
ringer for that call only.
7Screen: Use the Control and OK keys on the right to select onscreen items.
8Softkeys: Press to access the option shown onscreen above the softkey.
9Control Up: Press to scroll up a list or to increase an onscreen control, such as screen
brightness.
10 OK: Press to select a highlighted item or accept the control setting.
11 Control Down: Press to scroll down a list or to decrease an onscreen control, such as screen
brightness.
Get to Know Your Calisto

9
Screen
Idle Screen Notifications
When you are not on a call, the screen displays either the Plantronics logo or some or all
of the following information, depending on the connected phone line, the services you have
subscribed to (such as voicemail), and/or the softphone you are using:
Status Bar Icons
The status bar is the row of icons at the top of most screens.
1Your online status, as shown in your softphone*
2Connected Bluetooth mobile phone or headset status
3Current time based on your PC clock
4Missed calls (total for all connected landline, mobile, and softphones*) (not shown)
5New voicemail (for connected landline and softphones*) (not shown)
*If supported by your softphone. Check the features available for your softphone.
MENUDIAL
MENUDIAL
Available
9:20 AM
1
2
3
: Shows the level of voice activity during a call. If the call is muted, the indicator displays no
bars.
Headset/headphone/earbud connection indicators
: Your Calisto is connected to a Bluetooth headset. Call audio is routed to the headset.
: Your Calisto is connected to a wired headset, headphones, or earbuds. Call audio is routed
to the headset, headphones, or earbuds.
: You are in a call and your PA50 wireless mic is active.

10
Outgoing Line
Outgoing phone line indicators
When you make an outgoing call, the call is made by default using the last line you selected on
the Dial screen (see Make a Call on page 11). To choose a different line, simply highlight the line
of your choice on the Dial screen. If the last line used is unavailable, outgoing calls are made
over the first available line, in this order: softphone, landline (P830 & P835 models only), mobile
phone. Note that you can answer incoming calls from any connected phone line on your Calisto.
: Outgoing calls are made over your default softphone line.
: Outgoing calls are made over your analog landline (P830 & P835 models only).
: Outgoing calls are made over your connected mobile phone line.
Online status indicators (if supported by your softphone application)
If supported by your softphone, your Calisto displays your online status, such as available, busy,
away, and so on. Actual icons vary according to the softphone.
Menu
The menu gives you access to many Calisto features. To display the menu, do one of the
following:
• When the idle screen is displayed, press Menu (right softkey) or any key on your Calisto.
• When you are working with a feature within a menu, press and hold Back (left softkey) to
return directly to the main menu.
• Call Log: See Use the Call Log on page 14.
• Favorites: See Enter/Edit Favorites on page 15.
• Bluetooth: See Disconnect from/Reconnect to a Mobile Phone or Bluetooth Headset on page 26
• Settings: See Customize Your Calisto Settings on page 28.
Optimal Audio Performance
Your Calisto is optimized for personal use. To minimize background noise, the microphone pick-
up range is limited. This illustration shows ideal placement of your Calisto to optimize voice
pick-up:
If you require 360-degree room coverage to handle multi-party calls, consider using the
Plantronics PA50 wireless mic as an alternative. You can place the wireless mic on a table for
full 3600coverage (see Use Your Calisto with a Wireless Mic on page 22).

11
Your Calisto lets you use features such as answering calls from all your
connected phone lines, answering a second incoming call, or making a
second outgoing call.
Make a Call
IMPORTANT: The Dial menu may show “PC Unavailable” even if Calisto 800 is connected to the
PC. Reason: The Dial menu shows PC available for dialing for supported softphone applications
that can accept digits from Calisto 800. See “Dial Default Softphone (digits)” under “Make a Call” in
the “Calisto 800 Feature Table” that support dialing from Calisto 800. For softphones that do not
support dialing via Calisto 800, dialing may still be possible via softphone dialing menu on your PC.
Use the Dialpad
1To bring up the dialpad from the idle screen or the menu, either press Dial (left softkey) or tap
the unlit dialpad.
NOTE: If the idle screen or the menu is displayed, you can simply enter the number without bringing
up the dialpad.
2If you want to dial the number using a line other than the current outgoing line (see Outgoing
Line on page 10), select the line you want to use.
3Enter the number on the dialpad.
NOTE: To delete the last digit you entered, press BACKSPACE (right softkey). To delete all the
digits you entered, press and hold BACKSPACE (right softkey).
4To dial the number, press Talk/End or OK .
Dial a Call Log Entry
See Use the Call Log on page 14.
Dial a Favorite
See Enter/Edit Favorites on page 15.
Answer or Ignore a Call
Answer a Call
Press Answer (right softkey) or Talk/End .
NOTE: If you use a Calisto model P830 or P835 with a landline, see Special Features for Using Your
Calisto P830 with a Landline on page 13.
Ignore a Call
Press Ignore (left softkey). If ringing phone line has voicemail service, the call will continue
through to voicemail.
Answer a Second Incoming Call
If you are on a call and receive an incoming call notification, do one of the following:
• To put the current call on hold and answer the new incoming call: Press Hold & Answer (right
softkey). You can then switch between the two calls (see Switch Between Calls on page 12).
• To hang up the current call and answer the new incoming call: Press Talk/End to hang up the
current call. Press Answer (right softkey) or Talk/End to answer the new call.
Use Call Features

12
Switch Between Calls
Press Control Up or Down to highlight the call you want to make active. The other call is
automatically put on hold.
NOTE: If you use a Calisto model P830 or P835 with a landline, see Special Features for Using Your
Calisto P830 with a Landline on page 13 for more information on call switching.
Mute a Call
You can mute the currently active call at any time by pressing Mute . The Mute key turns red
when call is muted. Press Mute again to unmute the call. The Mute key turns white.
NOTE: If you put a call on hold (by answering a second call, making a second call, or switching
between two active calls), the call on hold is automatically muted.
End a Call
To end the active call, press End (left softkey) or Talk/End Note the following:
• If you have one active call and one call on hold, ending the active call makes the call on hold active.
• If you have one active call and more than one call on hold, ending the active call makes the last
call placed on hold active.
Use Other Call Options
Make a Second Outgoing Call
BACK
Dial a Number
Mobile
PC
1While on a call, press Options > Place new Call.
2Select an option for making the second call: Dial (dialpad), Call Log, or Favorites. When the
phone begins dialing the second call, the first call is placed on hold.
NOTE: The Make a Call option is available only for a phone line that is not currently in use. For
example, if you are on a call on your analog landline, you can make a second outgoing call on your
mobile phone or softphone line.
Enter Passwords and Numbers
OPTIONSSWITCH (Flash)
Connected:
555-1212
9

13
If you are on a call and are prompted to navigate a phone tree or enter a password, simply enter
the numbers using the dialpad. Or press Options (right softkey) > Enter digits, and enter the
numbers on the dialpad. This works with mobile, home landline, and softphone calls.
Special Features for Using Your P830 & P835 Calisto with a Landline
Use the Flash Feature
OPTIONSSWITCH (Flash)
Connected:
555-1212
00:01:49
During an analog landline call, the left softkey is labeled Switch (Flash). Use this key in any of
the following situations:
• If you are on a call and a second call comes in, on another press Hold & Answer (right softkey)
to answer the incoming call.
• If you receive a call on the same line, press Switch (Flash) (left softkey) to switch between these
calls.
• If you are on one call, to call a second person, press Switch (Flash) (left softkey) to get a dial
tone, and then dial the number.
• If you have two calls, to call a third person, press Options (right softkey) > Place new call to
get a dial tone, and then dial the number. When the person answers, press Switch (Flash) (left
softkey) to connect the person.
NOTE: You can also press Options (right softkey) to change the audio device or enter digits.
Use Multiple Phones with the Same Landline
If you have multiple phones using the same analog landline for your Calisto, and a call is made
or answered on another phone, your Calisto screen shows that a call is in progress and the
landline is in use. You do either of the following:
• Press Talk/End or Pickup Call (right softkey) to use your Calisto to join in the call. To hang up
from the call, press Talk/End or Hang up (left softkey). This does not end the call.
• Press Main Menu (left softkey) to access the menu. You can use the menu items in the same
way as at any other time. Select Landline Call (right softkey) to return to the call.

14
BACK OPTIONS
Call Log
1 [phone]
US CELLULAR
MOM
JOHNSON M
HOME
The Call Log lists all incoming, outgoing, and missed calls for all phone lines connected to
your Calisto. If the caller name is known, the name is shown; otherwise, the phone number is
shown. For calls made today, the time is shown. For older calls, the date is shown. Call Log icons
include the following:
: Missed call
: Outgoing call
: Incoming call
From the Call Log, you can do any of the following:
• Call a number: Highlight the Call Log entry. To call using the current outgoing line, press Talk/
End To call using a different line, press OK , highlight the line, and press Talk/End or
OK .
• View call details including call duration and phone type, if known: Highlight the Call Log entry
and press Options (right softkey) > Call Details.
• Add the Call Log entry to Favorites: See Create a Favorite from a Call Log Entry on page 16 for
details.
• Sort the Call Log list: From the Call Log, press Options (right softkey) > Sort List. Select whether
to sort the list by incoming, outgoing, or missed calls.
• Delete a Call Log entry: Highlight the entry and press Options (right softkey) > Delete this record.
Select Yes to confirm.
• Delete the entire Call Log: From the Call Log, press Options (right softkey) > Delete all records.
Select Yes to confirm.
Use the Call Log

15
You can enter names and numbers as favorites so you can easily dial
them right on your Calisto. For each favorite, you can enter multiple phone
numbers and label them as home (H), work (W), mobile (M), or other (O).
Create a Favorite
You can create a favorite from an ended call, from your Call Log, or manually.
Create a Favorite from an Ended Call
Call Ended (00:03:15)
555-1212
Add this number to Favorites?
No Ye s
1When you end a call from a number that is not already in Favorites, an Add to Favorites?
prompt appears. Press Yes (right softkey).
2Do one of the following:
• To add the number to an existing favorite: Select Add to existing. Select the favorite to use, and
then select the number type to assign the number to. If a number already exists for that type,
press Yes (right softkey) to replace the existing number.
• To create a new favorite for the number: Select Create new favorite. Select the number type
(Home, Work, Mobile, Other) and enter or edit the name, if desired. Note the following when
entering letters:
To enter the second letter on a key: Press the key twice—for example, to enter K, press 5
twice. Press 5three times to enter L, and so on
To switch among lowercase letters, uppercase
letters, title case, and numbers:
Press *. The currently selected option is shown in the
upper-right corner of the screen
To enter special characters: Press 1.
To enter a space: Press #or select Insert a Space onscreen.
To delete the last character entered: Press BACKSPACE (right softkey).
To delete all characters entered: Press and hold BACKSPACE (right softkey).
To move the cursor forward or backward
through the characters without making a
deletion:
Press Control Up or Down
Enter/Edit Favorites

16
• Press Save (left softkey) twice.
Create a Favorite from a Call Log Entry
BACK
Options
Call Details
Add to Favorites
Sort List
Delete this record
Delete all records
1Highlight a Call Log entry and press Options (right softkey) > Add to Favorites.
2Do one of the following:
• To add the number to an existing favorite: Select Add to existing. Select the favorite to use,
select the number type to assign the number to, and press Edit (right softkey). If a number
already exists for that type, press Yes (right softkey) to replace the existing number.
• To create a new favorite for the number: Select Create new favorite. Select the number type
and enter or edit the name, if desired. See Create a Favorite from an Ended Call on page 15 for
information on entering characters.
• Press Save (left softkey) twice.
Create a Favorite Manually
BACK/SAVE EDIT
New Favorite
Name
H
W
M
O
1Press Menu (right softkey) > Favorites > New Favorite (right softkey).
2Highlight Name, press Edit (right softkey), and use the dialpad to enter the name. See Create a
Favorite from an Ended Call on page 15 for information on entering characters.
3Press Save (left softkey).
4Highlight a phone number type (H= home, W= work, M= mobile, O= other), press Edit (right
softkey), and use the dialpad to enter the number. Repeat for each type of number you want to
enter. Note the following when entering numbers:

17
To enter a + symbol: Press and hold 0.
To insert a 1-second pause in the numbers you are
entering:
Select Insert a Pause onscreen. Inserting a pause
allows you to add/edit passcodes/passwords
to phone numbers so that the entire string
automatically gets dialed. This feature is known as
“chain dialing.”
To delete the last character entered: Press BACKSPACE (right softkey).
To delete all characters entered: Press and hold BACKSPACE (right softkey).
To move the cursor forward or backward through
the characters without making a deletion:
Press Control Up or Down .
5Press Save (left softkey) twice.
Dial a Favorite
1Press Menu (right softkey) > Favorites.
2Select the favorite and highlight the number you want to dial.
3To dial the number using the current outgoing line (see Outgoing Line on page 10), press Talk/
End . To dial the number using a different line, press OK select the line, and then press OK
or Talk/End .
Edit a Favorite
1Press Menu (right softkey) > Favorites.
2Select the favorite and press Options (right softkey) > Edit Favorite.
3Highlight the name or number you want to edit and press Edit (right softkey).
4Use the dialpad to make the changes you want. See Create a Favorite from an Ended Call on
page 15 for details on entering letters, and Create a Favorite Manually on page 16 for details on
entering numbers.
5Press Save (left softkey) twice.
Search for a Favorite
When you have Favorites open (Menu (right softkey) > Favorites), you can use the dialpad to
search for a favorite, as follows:
• Press a number key to jump to the first Favorites entry that starts with the first letter shown
on the key—for example, press 5to jump to the first entry that starts with J.
• Press the key twice to jump to the first entry that starts with the second letter shown on the
key—for example, press 5twice to jump to the first entry that starts with K. Press 5three times
to jump to the first entry that starts with L, and so on.
• If there is no entry that starts with a given letter, the highlight jumps to the first entry that
starts with the next letter. So, if there is no K entry, pressing 5twice jumps to the first entry
that starts with L.

1818
Delete a Favorite
1Press Menu (right softkey) > Favorites.
2Select the favorite and press Options (right softkey) > Delete Favorite.
3Press Yes (right softkey) to confirm.

19
You can access voicemail from your Calisto for both your analog landline
(P830 & P835 models only) and your softphone, if the softphone application
supports this feature.
To use your Calisto to access analog landline voicemail, you need to enter your landline
voicemail access number. You can do this from the Settings menu (see Enter Your Voicemail
Access Number on page 29).
When you have a new voicemail message, a message icon appears on the idle screen.
MENUDIAL
Available
9:20 AM
Voicemail
To check voicemail:
1From the main menu or the Dial screen, press and hold 1 on the dialpad.
2If your Calisto is set up to access voicemail from more than one phone, select the phone you
want to check.
BACK
Voicemail
Landline Voicemail
Pc Voicemail
Access Voicemail

20
You can route call audio from any connected phone (mobile, softphone, or
home landline) to a connected headset.
Supported Headset Types
Headset Type Jack Type Insert Jack Into: Microphone Used
On:
Corded
Headphones/
Earbuds
Single 3.5mm jack Insert into Calisto
jack.
Calisto
Headsets/
Earbuds with
Microphones
Single 3.5mm jack Insert into Calisto
jack.
Calisto
Headsets with
Microphones
Single 2.5mm jack Requires Plantronics
2.5mm-to-3.5mm adapter
(part # 76920-07).
Insert into Calisto
jack.
Calisto
Headphones with
Microphones
Dual 3.5mm jack Insert into both Calisto
and jacks.
Headphones
Plantronics
Professional
H-Tops (Example:
Plantronics
SupraPlus wideband
Headset)
Quick Disconnect Yes. Requires Plantronics
QD-to-Dual-3.5mm adapter
(part # 28959-01). Insert into
both Calisto
and jacks.
H-Top
Wireless
Bluetooth Headset/
Headphones
(Example: Plantronics
Voyager PRO+)
Wireless NA Headset
Plantronics PA50
Wireless Mic
Wireless NA Can switch
between wireless
mic and Calisto
Switch Call Audio Between Your Calisto and a Headset
To switch call audio between your Calisto speakerphone and any connected headsets, do one of
the following:
• When you are not on a call: Press Audio Options . If you have one headset connected to your
Calisto, pressing this key switches from the speakerphone to the headset and back. If you have
more than one headset connected to your Calisto, pressing this key opens the Audio Devices
screen. Select the device you want to use. This device now becomes the default audio device—
audio for new incoming calls plays over this device unless you change it.
Use Your Calisto with a Headset