Detecting Answering Machine Beeps - AudioCodes Mediant 4000 SBC User Manual

User's Manual
Content-Type: Application/X-Detect
Type = [event type]
Subtype = [subtype of each event type]
The table below lists the event types and subtypes that can be detected by the device. The
text shown in the table are the strings used in the X-Detect header. The table also provides
a summary of the required configuration. For SBC calls, event detection is enabled using
the IPProfile_SBCHandleXDetect parameter in the IP Profiles table (see Configuring IP
Profiles on page 418).
Event
Type

Voice (live voice)
AMD

Automata (answering machine)

Silence (no voice)

Unknown

Beep (greeting message of
answering machine)

Busy
CPT

Reorder

Ringtone

Beep (greeting message of
answering message)

14.4.1 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
For more information on the CPT file, see ''Call Progress Tones File'' on page 629.
Version 7.2
Table 14-1: Supported X-Detect Event Types
Subtype Description and Required Configuration
Event detection using the AMD feature. For more
information, see Answering Machine Detection
(AMD) on page 200.
Event detection of tones using the CPT file.
Create a CPT file with the required tone types of
1
the events that you want to detect.
Install the CPT file on the device.
2
Note: To configure beep detection, see Detecting
Answering Machine Beep on page 197.
197
14. Media
Mediant 4000 SBC