SIP telephones and SIP softphones generally feature special keys or menu entries to manage
calls. Depending on the model or program, different terms may be used the the functions are as
follows:
- HOLD: Places an active call into a wait mode or swaps between two active calls. On ISDN
and analog telephones this function is often referred to as the F-key/Flash/Call hold. Flash
function (F key).
- HANG UP: End the current call.
- SWAP: Swap between two active calls (depending on the ISDN telephone, this may be
initiated by a display-menu entry, a special key, or the "F" key).
- CONNECT: Initiates the call's transfer (can be triggered by "hanging-up" with an active
call and a call on hold)*.
These functions can be used to manage calls as follows:
| Holding/consulting and continuing with calls
|
SIP
|
ISDN
|
Analog
|
| To place a call on hold, press the Flash/Call hold key (or 'F'
on analog phones).
The caller can no longer hear you and you can initiate a
second call by dialing a telephone number (consulting).
|
HOLD
|
HOLD or F
|
R
|
| To continue with a call which is on hold, press the Flash/Call
hold key again (or 'F 2').
|
HOLD
|
HOLD or F
|
F 2
|
| If the consultation call has not yet been picked up, you can
stop the consulting by hanging up the handset on a SIP or ISDN
telephone*.
You can stop the consultation call with the appropriate menu
function of the telephone (e.g. 'Cancel') or 'F 1' (analog).*
|
HANG UP
|
HANG UP
|
HANG UP
|
| Swap call
|
SIP
|
ISDN
|
Analog
|
| To open a second line during a call, first press the Flash/Call
hold key (or 'F' on analog phones).
The other caller can no longer hear
you.
|
HOLD
|
HOLD or F
|
R
|
| Dial the number for the second caller while the first call is
on hold.
If you cannot reach the second caller, you can return to the call
which is on hold by pressing the hold key (or 'R').
|
123456789
|
123456789
|
123456789
|
| As soon as two simultaneous connections are open, you can use
the hold key (or swap key for ISDN phones, 'R' and '2' for analog phones) to swap
to-and-fro between the two connections.
You will be connected to one of the
other callers; the other caller is placed on hold.
|
HOLD
|
SWAP
|
F 2
|
| To end an active call, hang up the handset on SIP or ISDN
telephones, and on analog phones press 'R 1'.
The call which is on hold is not
automatically reactivated, but it will be signaled (ringing phone) for a period of
15 seconds.
|
END or HANG UP*
|
END or
HANG UP*
|
F 1
|
| Call transfer, consult
|
SIP
|
ISDN
|
Analog
|
| To open a second line during a call, first press the Flash/Call
hold key (or 'F' on analog phones).
The other caller can no longer hear
you.
|
HOLD
|
HOLD or F
|
R
|
| Dial the number for the second caller while the first call is
on hold.
If you cannot reach the second caller, you can return to the call
which is on hold by pressing the hold key.
|
123456789
|
123456789
|
123456789
|
| As soon as you have established two simultaneous connections
you can connect the two callers with the connect key (or 'R' and '4' on analog
phones) or by hanging up the handset.*
Optionally you can switch between the
two lines as often as you like before transferring. Call transfer always connects
the active call and the call on hold.
|
CONNECT or HANG UP*
|
CONNECT or HANG UP*
|
R 4 or HANG UP
|
| You have no more active calls. You can either hang up or make a
new call.
|
HANG UP 123456789
|
HANG UP 123456789
|
HANG UP 123456789
|
| Call transfer, blind
|
SIP
|
ISDN
|
Analog
|
| To open a second line during a call, first press the Flash/Call
hold key.
The other caller can no longer hear you.
|
HOLD
|
HOLD
|
HOLD
|
| Dial the number for the second caller while the first call is
on hold.
|
123456789
|
123456789
|
123456789
|
| Press the connect key (or 'R' and '4' on analog phones) or
hang-up the handset before the second connection has been established.*
The
two callers will now be connected "in the background".
|
CONNECT or HANG UP*
|
CONNECT or HANG UP*
|
R 4 or HANG UP
|
| You have no more active calls. You can either hang up or make a
new call.
|
HANG UP 123456789
|
HANG UP 123456789
|
HANG UP 123456789
|
Note: *In some cases, SIP or ISDN telephones can be configured so that hanging-up the handset
either causes the consultation or active call or be terminated, or a call transfer is
triggered ("Connect").