AudioCodes Mediant 4000 SBC User Manual page 201

User's Manual
Once you have provided AudioCodes with your database of recordings, AudioCodes
compiles it into a loadable file. For a brief description of the file format and for installing the
file on the device, see ''AMD Sensitivity File'' on page 639.
The device supports up to eight AMD algorithm suites called Parameter Suites, where each
suite defines a range of detection sensitivity levels. Sensitivity levels refer to how
accurately, based on AudioCodes' voice detection algorithms, the device can detect
whether a human or machine has answered the call. Each level supports a different
detection sensitivity to human and machine. For example, a specific sensitivity level may
be more sensitive to detecting human than machine. In deployments where the likelihood
of a call answered by an answering machine is low, it would be advisable to configure the
device to use a sensitivity level that is more sensitive to human than machine. In addition,
this allows you to tweak your sensitivity to meet local regulatory rules designed to protect
consumers from automatic dialers (where, for example, the consumer picks up the phone
and hears silence). Each suite can support up to 16 sensitivity levels (0 to 15), except for
Parameter Suite 0, which supports up to 8 levels (0 to 7). The default, pre-installed AMD
Sensitivity file, based on North American English, provides the following Parameter Suites:

Parameter Suite 0 (normal sensitivity) - contains 8 sensitivity detection levels

Parameter Suite 1 (high sensitivity) - contains 16 sensitivity detection levels
As Parameter Suite 1 provides a greater range of detection sensitivity levels (i.e., higher
detection resolution), this may be the preferable suite to use in your deployment. The
detected AMD type (human or machine) and success of detecting it correctly are sent in
CDR and Syslog messages. For more information, see ''Syslog Fields for Answering
Machine Detection (AMD)'' on page 768.
The Parameter Suite and sensitivity level can be applied globally for all calls, or for specific
calls using IP Profiles. For enabling AMD and selecting the Parameter Suite and sensitivity
level, see ''Configuring AMD'' on page 202.
The tables below show the success rates of the default, pre-installed AMD Sensitivity file
(based on North American English) for correctly detecting "live" human voice and
answering machine:
Table 14-2: Approximate AMD Normal Detection Sensitivity - Parameter Suite 0 (Based on
AMD Detection
Sensitivity
0 (Best for
Answering
Machine)
1
2
3
4
5
6
7 (Best for Live
Calls)
Version 7.2
North American English)
Success Rate for Live Calls
-
82.56%
85.87%
88.57%
88.94%
90.42%
90.66%
94.72%
Performance
Success Rate for Answering Machine
201
14. Media
-
97.10%
96.43%
94.76%
94.31%
91.64%
91.30%
76.14%
Mediant 4000 SBC