Call Waiting; Message Waiting Indication - 3Com VCX v7111 User Manual

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.

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 (see the parameter
FirstCallWaitingToneID in
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.

Message Waiting Indication

Support for Message Waiting Indication (MWI) according to IETF <draft-ietf-sipping-mwi-
04.txt>, including SUBSCRIBE (to MWI server). V7111/FXS gateways 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 (see
File). If the MWI display is configured, the number of waiting messages is also displayed. If
250
Table 49).
Configuring the Call Progress Tones and Distinctive Ringing
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VCX V7111 VoIP Gateway User Guide