Help > Functions and Applications > Call and transfer
Call and transfer
When the app is open, the call is displayed.
*Description of the operation and display under Call
*Note: If the app is minimised or in the background, it will only be displayed when you select the app in the taskbar.
During a call, the following options are available.
•Start transfer: If you want to transfer the caller without announcement, you can start a transfer. As soon as the transfer destination is called, your own call connection is severed. If the transfer target does not answer, the call is returned (rings).
•Start a new call: To transfer the caller or to initiate a query/conference, you can make another call.
•Accept/reject a waiting call: To transfer the caller or initiate a query/conference, you can accept a waiting call. Otherwise, reject the call.
•Mute/Hold: If you want to interrupt a call for a short time, you can mute the microphone (the other party remains connected and can continue speaking) or put the call on hold (the other party hears the hold music).
•Send DTMF digits: To transfer certain information to the PBX, provider or remote station, you can send DTMF digits to the active call partner.
The following symbol ends the call:
*Note: When using a headset, the call can also be ended by pressing the headset hook button.
*Further help under Audio devices, headset
*Note: After the call/conversation has ended, the app switches back to the page previously opened via the navigation.
query call 
*Description of the operation and display under Query call
During a query call, you speak to one caller while the other caller is held in the background by the PBX and listens to the hold music.
A query call is initiated by starting a new call or by answering a call announced by the call waiting tone.
During a query call, the following options are available.
•Splitting a call: You can use the transfer function to alternate between the call partners.
•End one of the two calls: When you end a query call and would like to continue talking with one of the call partners, you can end the call with the other call partner separately. Alternatively, one of the call partners can simply hang up so that you can continue talking with the other call partner.
•Connect both call partners: If you would like to let your call partners speak with each other, you can connect them.
*Note: In order to connect two external callers to each other, the authorisation "Transferring external calls to external" must be granted in the PBX.
*Please consult the PBX manual for this.
•Start transfer: If you want to end a query call and transfer one of the two call partners, you can start a transfer for the active conversation partner. The previously held call remains intact. As soon as the transfer destination is called, your own call connection is severed. If the transfer target does not answer, the call is returned (rings).
•Mute/Hold: If you want to interrupt a call for a short time, you can mute the microphone (the other party remains connected and can continue speaking) or put the call on hold (the other party hears the hold music).
•Send DTMF digits: To transfer certain information to the PBX, provider or remote station, you can send DTMF digits to the active call partner.
Transferring calls 
*Description of the operation and display under Transferring calls
During an existing call, the following options are available for transfer.
•Transfer with announcement: You can connect both conversation partners from an existing query call.
•Transfer without announcement: You can start a transfer from an existing call or query call. As soon as the transfer destination is called, your own call connection is severed. If the transfer target does not answer, the call is returned (rings).
*Note: In order to connect two external callers to each other, the authorisation "Transferring external calls to external" must be granted in the PBX.
*Please consult the PBX manual for this.
Conference 
*Description of the operation and display under Conference
During a conference you speak to two call partners at the same time.
All the options listed above are for a conference call that you have initiated yourself.
•Dissolve conference: One caller is on hold and there is an active connection with the other caller. You can change between holding a call and an active call.
•Holding a conference call and initiating an additional call: The entire conference call is held. The conference call partner hears music on hold. When the call ends, the conference call can be continued.
•Ending a conference call completely: If you initiated the conference call, you can end the conference call completely.
•Mute/Hold: If you want to interrupt a call for a short time, you can mute the microphone (the other party remains connected and can continue speaking) or put the call on hold (the other party hears the hold music).
•Send DTMF digits: To transmit certain information to the PBX, provider or remote station, you can send DTMF digits.