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Call Forwarding
Forwarding affects the treatment by the switch or network of incoming calls
destined for a given address. The application can specify call forwarding
conditions based on the origin of the call (internal, external, selective based on
caller ID); the status of the address (busy, no answer, unconditionally); and the
destination address where calls are to be forwarded. When the specified
conditions are met for an incoming call, the switch deflects the incoming call to the
specified destination number. Because the switch performs the forwarding
action, the application will typically not know when a call has been forwarded.
The lineForward function provides a combination of call forwarding (by setting
call-forwarding requests) and a do-not-disturb feature. The lineForward function can also cancel any or all of the forwarding requests currently in
effect. Some switches require that a call be established to the forwarding
address for call forwarding to be initiated. On such systems, lineForward allocates a consultation call and returns the handle for it to the
application. The consultation call can be used as any other call. After the connection is
established, forwarding confirmation is received from the switch, the call is
dropped (using lineDrop), and forwarding is in effect. A LINE_ADDRESSSTATE message with a forwarding indication informs the application about changes in an address' forwarding
status.
Note It may be impossible for a service provider to know at all times what
forwarding is in effect for an address. Forwarding can be canceled or changed in ways
that make it impossible for a service provider to be informed of this fact.
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