Using spontaneous call management with various telephones

SIP telephones and SIP softphones generally feature special keys or menu entries to manage calls. Different terms may be used depending on the model or software program, but the functions are as follows:

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). CALL HOLD HOLD or F R
To continue with a call which is on hold, press the Flash/Call hold key again (or "F 2"). CALL 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.1 You can stop the consultation call with the appropriate menu function of the telephone (e.g. "Cancel") or "F 1" (analog).1 HANG UP (1st call rings) HANG UP (1st call rings) R 1 (back to 1st call)
Swap 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. CALL 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 "F" on analog telephones). 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. CALL HOLD CALL 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. CANCEL or HANG UP1 CANCEL or HANG UP1 F 1
Call forwarding, 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. CALL 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 "F" and "4" on analog phones) or by hanging up the handset.1 Optionally you can switch between the two lines as often as you like before transferring the call. Call transfer always connects the active call and the call on hold. TRANSFER or HANG UP1 TRANSFER or HANG UP1 R 4 or HANG UP
Call transfer, blind SIP
To open a second line during a call, first press the Flash/Call hold key. The other caller can no longer hear you. CALL HOLD
Dial the number for the second caller while the first call is on hold. 123456789
Press the connect key or hang-up the handset before the second connection has been established.1 The two callers will now be connected "in the background". TRANSFER or HANG UP1
1
Note: In some cases, SIP or ISDN telephones can be configured so that hanging-up the handset either causes the consultation or active call to terminate, or a call forwarding is triggered ("Transfer").

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