User`s manual

SIP User's Manual 8. Telephony Capabilities
Version 5.0 217 December 2006
8.1.4 Call Forward
Five forms of call forward are supported:
 Immediate: Any incoming call is forwarded immediately and unconditionally.
 Busy: Incoming call is forwarded if the endpoint is busy.
 No Reply: The incoming call is forwarded if it isn't answered for a specified time.
 On Busy or No Reply: Forward incoming calls when the port is busy or when calls
are not answered after a specified time.
 Do Not Disturb: Immediately reject incoming calls. Upon receipt of a Do Not Disturb
call, the gateway responds with a 603 Decline SIP code.
Three forms of forwarding parties are available:
 Served party: the party that is configured to forward the call (MediaPack/FXS)
 Originating party: the party that initiated the first call (MediaPack/FXS or FXO)
 Diverted party: the new destination of the forwarded call (MediaPack/FXS or FXO)
The served party (MediaPack/FXS) can be configured through the Web browser (refer to
Section 5.5.9.4 on page 122) or via ini file to activate one of the call forward modes. These
modes are configurable per gateway's endpoint.
Note the following SIP issues:
 Initiating forward – When forward is initiated, the gateway sends a 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 Proxy is used, the proxy’s IP address).
 Receiving forward – The gateway handles 3xx responses for redirecting calls with a
new contact.
8.1.5 Call Waiting
The Call Waiting feature enables FXS gateways to accept an additional (second) call on
busy endpoints. If an incoming IP call is designated to a busy port, the called party hears
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. Called party can accept the new call, using hook-flash, and can toggle
between the two calls.
To enable Call Waiting:
 Set ‘EnableCallWaiting = 1’.
 Set ‘EnableHold = 1’.
 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 Table 5-35).
 To configure the Call Waiting indication tone cadence, modify the following
parameters: ‘NumberOfWaitingIndications’, ‘WaitingBeepDuration’ and
‘TimeBetweenWaitingIndications’.
 To configure a delay interval before a Call Waiting Indication is played to the currently
busy port use the parameter ‘TimeBeforeWaitingIndication’. This enables the caller to
hang up before disturbing the called party with Call Waiting Indications. Applicable
only to FXS gateways.
Both the calling and the called sides are supported by FXS gateways; the FXO gateways
support only the calling side.
To indicate Call Waiting, the gateway sends a 182 - call queued response.
The gateway identifies a Waiting Call when a 182 (call queued response) is received.