Call Forward

For digital interfaces:

The device supports Call Deflection (ETS-300-207-1) for Euro ISDN and QSIG (ETSI TS 102 393) for Network and User sides, which provides IP-ISDN interworking of call forwarding (call diversion) when the device receives a SIP 302 response.

Call forward performed by the SIP side: Upon receipt of a Facility message with Call Rerouting IE from the PSTN, the device initiates a SIP transfer process by sending a SIP 302 (including the Call Rerouting destination number) to the IP in response to the remote SIP entity's INVITE message. The device then responds with a Disconnect message to the PSTN side.

Call forward performed by the PSTN side: When the device sends the INVITE message to the remote SIP entity and receives a SIP 302 response, the device sends a Facility message with the same IE mentioned above to the PSTN, and waits for the PSTN side to disconnect the call. This is configured using the CallReroutingMode.

For analog interfaces:

The following methods of call forwarding are supported:

■

Immediate: incoming call is forwarded immediately and unconditionally.

■

Busy: incoming call is forwarded if the endpoint is busy.

■

No Reply: incoming call is forwarded if it isn't answered for a specified time.

■

On Busy or No Reply: incoming call is forwarded if the port is busy or when calls are not answered after a specified time.

■

Do Not Disturb: immediately reject incoming calls. Upon receiving a call for a Do Not Disturb, the 603 Decline SIP response code is sent.

Three forms of forwarding parties are available:

■

Served party: party configured to forward the call (FXS device). To configure this type of forwarding party and per endpoint, see Configuring Call Forward.

■

Originating party: party that initiates the first call (FXS or FXO).

■

Diverted party: new destination of the forwarded call (FXS or FXO).