User`s manual

SIP User's Manual 440 Document #: LTRT-83303
Mediant 1000 & Mediant 600
7.14.5 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
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.
Note: This section is applicable only to Mediant 1000.
To enable Call Waiting:
 Set EnableCallWaiting = 1 (or using the Web interface, refer to ''Supplementary
Services'' on page 176)
 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
323).
 To configure the Call Waiting indication tone cadence, modify the following
parameters: NumberOfWaitingIndications, WaitingBeepDuration and
TimeBetweenWaitingIndications (or using the Web interface, refer to ''Supplementary
Services'' on page 176).
 To configure a delay interval before a Call Waiting Indication is played to the currently
busy port use the parameter TimeBeforeWaitingIndication (or using the Web interface,
refer to ''Supplementary Services'' on page 176). 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 device sends a 182 Call Queued response. The device
identifies a Waiting Call when a 182 Call Queued response is received.
7.14.6 Message Waiting Indication
Support for 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 Configuring the Call Progress Tones File in 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).
Note: This section is applicable only to Mediant 1000.