Detecting Answering Machine Beeps; Sip Call Flow Examples Of Event Detection And Notification - AudioCodes Mediant 800 User Manual

CHAPTER 15 Media
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

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
INVITE message must contain an X-Detect header with the value "Request=AMD",
X-Detect: Request=AMD
and the [AMDBeepDetectionMode] parameter must be configured to [1] or [2]. If configured to
[1], the beep is detected only after the answering machine is detected. If configured 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
The device reports beep detections to application servers, by sending a SIP INFO message that
contains a body with one of the following values, depending on the method used for detecting the
beep:
■ AMD-detected Beep:
Type= AMD
SubType= Beep
■ CPT-detected Beep:
Type= CPT
SubType=Beep

SIP Call Flow Examples of Event Detection and Notification

Two SIP call flow examples are provided below of event detection and notification:
Configuring AMD). To enable the AMD beep detection, the received
Call Progress Tones
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