Version 5.8 521 October 2009
SIP User's Manual 9. IP Telephony Capabilities
9.14.6 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 318).
4. To configure the Call Waiting indication tone cadence, modify the following
parameters: NumberOfWaitingIndications, WaitingBeepDuration and
TimeBetweenWaitingIndications.
5. 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 modules.
Both the calling and called sides are supported by FXS interfaces; the FXO interfaces
support only the calling side.
To indicate Call Waiting, the device sends a 182 Call Queued response. The device
identifies Call Waiting when a 182 Call Queued response is received.
9.14.7 Message Waiting Indication
The device supports Message Waiting Indication (MWI) according to IETF <draft-ietf-
sipping-mwi-04.txt>, including SUBSCRIBE (to MWI server). The FXS device can accept an
MWI NOTIFY message that indicates waiting messages or that the MWI is cleared. Users
are informed of these messages by a stutter dial tone. The stutter and confirmation tones
are defined in the CPT file (refer to the Product Reference Manual). If the MWI display is
configured, the number of waiting messages is also displayed. If the MWI lamp is
configured, the phone’s lamp (on a phone that is equipped with an MWI lamp) is lit. The
device can subscribe to the MWI server per port (usually used on FXS) or per device (used
on FXO).
To configure MWI, use the following parameters:
îš„ EnableMWI
îš„ MWIServerIP
îš„ MWIAnalogLamp
îš„ MWIDisplay
îš„ StutterToneDuration
îš„ EnableMWISubscription
îš„ MWIExpirationTime
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