Incoming calls are diverted to another destination as defined by the user when the service is activated. Activation and deactivation of call forwarding services can be performed by the user or by another authorized user (the current "divert-to" person can deactivate calls from forwarding to them, or they can assign someone else to be the "divert-to" person). System rerouting is also supported across QSIG.
Activation and deactivation correspond to Remote Third Party Forwarding features, see Call Forwarding.
Several types of call diversion services are supported:
Call Forward Busy (CFB) - incoming calls to a busy extension are diverted. Activation and deactivation allows others in the network to set and remove forwarding for a particular end-point (for example, voice mail).
Call Deflection (CD) - the user can divert calls to another location by pressing the Forward softkey when notified of a new call (if HCI is implemented this may happen automatically).
Call Forward No Reply (CFNR) - incoming calls are diverted if not answered within a predefined period of time
Call Forward Unconditional (CFU) - all incoming calls are diverted.
