Version 6.6 251 MP-11x & MP-124
User's Manual 24. Configuring Supplementary Services
When the call forwarding service is de-activated, for example, by dialing #21# and sending
an INVITE with this number, the softswitch sends another SIP NOTIFY message with the
following Alert-Info header:
Alert-Info: <http://127.0.0.1/ Tono-Normal-Invitacion>; Aviso =
Desvi×£-Inmediato
From this point on, the device plays a normal dial tone to the FXS phone when it goes off-
hook.
24.6 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.
 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
FirstCallWaitingToneID parameter).
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; 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.
24.7 Message Waiting Indication
The device supports Message Waiting Indication (MWI) according to IETF RFC 3842,
including SUBSCRIBE to an 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. 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).
Notes:
• For more information on IP voice mail configuration, refer to the IP Voice
Mail CPE Configuration Guide.
• For creating a CPT file using AudioCodes CPTWizard utility, refer to
CPTWizard Utility User's Guide.
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