Version 5.8 427 September 2009
SIP User's Manual 9. IP Telephony Capabilities
9.15.5 Call Forward
The following forms of call forward 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 to Do Not
Disturb call, 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).
Originating party: party that initiated the first call (FXS or FXO device).
Diverted party: new destination of the forwarded call (FXS or FXO device).
The served party (FXS interface) can be configured through the Web interface (refer to
''Configuring Call Forward'' on page 146) or ini file to
activate one of the call forward modes.
These modes are configurable per device's endpoints.
Notes:
• When call forward is initiated, the device sends a SIP 302 response with
a contact that contains the phone number from the forward table and its
corresponding IP address from the routing table (or when a proxy is used,
the proxy’s IP address).
• For receiving call forward, the device handles SIP 3xx responses for
redirecting calls with a new contact.
9.15.6 Call Waiting
The Call Waiting feature enables FXS devices to accept an additional (second) call on busy
endpoints. If an incoming IP call is designated to a busy port, the called party hears a call
waiting tone (several configurable short beeps) and (for Bellcore and ETSI Caller IDs) can
view the Caller ID string of the incoming call. The calling party hears a Call Waiting
Ringback Tone. The called party can accept the new call using hook-flash, and can toggle
between the two calls.
¾ To enable call waiting:
1. Set the parameter EnableCallWaiting to 1.
2. Set the parameter EnableHold to 1.
3. Define the Call Waiting indication and Call Waiting Ringback tones in the Call Progress
Tones file. You can define up to four Call Waiting indication tones (refer to the
parameter FirstCallWaitingToneID in ''SIP Configuration Parameters'' on page 252).
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