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Version 5.2 359 August 2007
SIP User's Manual 7. Telephony Capabilities
„
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:
the party that is configured to forward the call (FXS gateway)
„
Originating party:
the party that initiated the first call (FXS or FXO gateway)
„
Diverted party:
the new destination of the forwarded call (FXS or FXO gateway)
The served party (FXS gateway) can be configured through the Embedded Web Server
(refer to 'Call Forward' on page
151 ) or via
ini
file to activate one of the call forward modes.
These modes are configurable per gateway endpoints.
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.
7.13.5 Call Waiting
The Call Waiting feature enables FXS gateway 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. The called party can accept the new call using hook-flash, and can toggle
between the two calls.
To enable Call Waiting:
„
Set EnableCallWaiting = 1 (or using the Embedded Web Server, refer to
'Supplementary Services' on page
108 )
„ 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 'SIP Configuration Parameters' on page
279 ).
„ To configure the Call Waiting indication tone cadence, modify the following
parameters: NumberOfWaitingIndications, WaitingBeepDuration and
TimeBetweenWaitingIndications (or using the Embedded Web Server, refer to
'Supplementary Services' on page
108 ).
„ To configure a delay interval before a Call Waiting Indication is played to the currently
busy port use the parameter TimeBeforeWaitingIndication (or using the Embedded
Web Server, refer to 'Supplementary Services' on page
108 ). This enables the caller
to hang up before disturbing the called party with Call Waiting Indications. Applicable
only to FXS modules.
Both the calling and called sides are supported by FXS modules; the FXO modules 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.