Initiating External Callback on Busy
If you have initiated a callback, as soon as the other subscriber has hung up the receiver to end the call, the public exchange calls you. If you then pick up the receiver, the other subscriber will be called. If the other subscriber picks up the receiver, the connection for the call will be established. This deletes the callback procedure in the public exchange.
Requirements:
•Fulfilling the technical requirements for a callback on busy (for instance, not all network providers provide callback on a PTP connection)
•Service feature CCBS (callback on busy) is enabled by the network provider.
Important: On system phones, this function is called via the menu/phone app (optional, see manual for the phone).
Note: To use this function at ISDN phones or to delete it again, this function must be supported via a function key or via the menu by the respective phone (optional, see manual for the phone).Note: You can also use this function on analogue phones, where it can be performed via the T-Net function key/menu (optional, see manual for the phone). Instead of the announcement by the public exchange, you will hear the confirmation tone.If the connection you are calling is busy, proceed as follows:
1.Press the Flash key or the Query key.
2.Dial *37#.
You will hear the confirmation tone.
Note: If you do not hear a confirmation tone, the callback request has been rejected by the public exchange.3.Hang up the receiver.
As soon as the connection is no longer busy, you will be called by the public exchange for a period of 20 seconds.
Note: A callback will be stored in the public exchange for a duration of up to 45 minutes. If the called subscriber has not terminated his call until then, the callback will automatically be deleted.4.Pick up the receiver to the make the callback.
Note: If you do not pick up the receiver within the 20 seconds during which the public exchange calls you, the callback request will be deleted.If you pick up the receiver, the subscriber will be called.
Note: You also have the option of letting the public exchange call you as soon as one of the B channels on the previously called ISDN connection is available. If the subscriber for which you have set up the callback is phoning on the other B channel, this callback will remain unsuccessful.