Version 6.2 261 February 2011
SIP User's Manual 8. IP Telephony Capabilities
Content-Type: "application/simservs+xml"
Message body is the XML body and contains the “dial-tone-pattern” set to "special-
condition-tone" (<ss:dial-tone-pattern>special-condition-tone</ss:dial-tone-pattern>),
which is the special tone indication.
For cancelling the special dial tone and playing the regular dial tone, the received SIP
NOTIFY message must contain the following headers:
From and To: contain the same information, indicating the specific endpoint
Event: ua-profile
Content-Type: "application/simservs+xml"
Message body is the XML body containing the “dial-tone-pattern” set to "standard-
condition-tone" (<ss:dial-tone-pattern>standard-condition-tone</ss:dial-tone-pattern>),
which is the regular dial tone indication.
Therefore, the special dial tone is valid until another SIP NOTIFY is received that instructs
otherwise (as described above).
Note: if the MWI service is active, the MWI dial tone overrides this special Call
Forward dial tone
8.2.7.6 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).
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.
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