User's Manual 172 Document #: LTRT-68822
Mediant 2000
Machine detection. If set to 2, the beep is detected even if the Answering Machine
was not detected.
Using the Call Progress Tone detector: To enable this detection mode, the X-
Detect header in the received INVITE message must include “Request=CPT”, and one
or several beep tones (Tone Type #46) must be configured in the regular CPT file.
The device reports beep detection by sending a SIP INFO message containing a body with
one of the following values:
Type=AMD and SubType=Beep
Type=CPT and SubType=Beep
Upon AMD activation, the device can send a SIP INFO message to an Application server
notifying it of one of the following:
Human voice has been detected
Answering machine has been detected
Silence (i.e., no voice detected) has been detected
The detected AMD type (e.g., voice) and success of detecting it correctly are also sent in
CDR and Syslog messages.
Note: You can configure the device to disconnect IP-to-Tel calls upon detection of an
answering machine on the Tel side, using the AMDmode parameter.
The table below shows the success rates of the AMD feature for correctly detecting live
and fax calls:
Approximate AMD Detection Normal Sensitivity (Based on North American English)
AMD Detection
Sensitivity
Performance
Success Rate for Live Calls Success Rate for Answering Machine
0 (Best for
Answering
Machine)
- -
1
82.56% 97.10%
2
85.87% 96.43%
3 (Default)
88.57% 94.76%
4
88.94% 94.31%
5
90.42% 91.64%
6
90.66% 91.30%
7 (Best for Live
Calls)
94.72% 76.14%
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