Version 7.2 197 Mediant 1000B Gateway & E-SBC
User's Manual 14. Media
Special
Information
Tones (SITs)
Name
Description First Tone
Frequency
Duration
Second Tone
Frequency
Duration
Third Tone
Frequency
Duration
(Hz) (ms) (Hz) (ms) (Hz) (ms)
VC Vacant circuit (non
registered number)
985.2 380 1370.6 274 1776.7
380
RO1 Reorder (system
busy)
913.8 274 1428.5 380 1776.7
380
NC* - 913.8 380 1370.6 380 1776.7
380
RO* - 985.2 274 1370.6 380 1776.7
380
IO* - 913.8 380 1428.5 274 1776.7
380
The following example shows a SIP INFO message sent by the device to a remote
application server notifying it that SIT detection has been detected:
INFO sip:5001@10.33.2.36 SIP/2.0
Via: SIP/2.0/UDP 10.33.45.65;branch=z9hG4bKac2042168670
Max-Forwards: 70
From: <sip:5000@10.33.45.65;user=phone>;tag=1c1915542705
To: <sip:5001@10.33.2.36;user=phone>;tag=WQJNIDDPCOKAPIDSCOTG
Call-ID: AIFHPETLLMVVFWPDXUHD@10.33.2.36
CSeq: 1 INFO
Contact: <sip:2206@10.33.45.65>
Supported: em,timer,replaces,path,resource-priority
Content-Type: application/x-detect
Content-Length: 28
Type= CPT
SubType= SIT-IC
14.4.2 Detecting Answering Machine Beeps
The device can detect the "beep" sound played by an answering machine that indicates the
end of the answering machine's greeting message. This is useful in that the device can
then notify, for example, a third-party, application server that it can now leave a voice
message on the answering machine. The device supports the following methods for
detecting and reporting beeps:
AMD-based Detection: The device uses its beep detector that is integrated in the
AMD feature. You can configure the beep detection timeout and beep detection
sensitivity level (for more information, see ''Configuring AMD'' on page
202). To enable
the AMD beep detection, the received INVITE message must contain an X-Detect
header with the value "Request=AMD",
X-Detect: Request=AMD
and the AMDBeepDetectionMode parameter must be set to 1 or 2. If set to 1, the beep
is detected only after the answering machine is detected. If set to 2, the beep is
detected even if the answering machine was not detected.
Tone-based Detection (Call Progress Tone): The device detects the beep
according to a call progress tone (CPT). This is enabled if the device receives a
specific beep tone (Tone Type #46) that is also defined in the installed CPT file and
the received INVITE message contains an X-Detect header with the value
"Request=CPT":
X-Detect: Request=CPT
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