Answering Machine Detection (Amd) - AudioCodes Mediant 1000B User Manual

User's Manual
<sip:anonymous@anonymous.invalid>;tag=1c25298
To: <sip:101@10.33.2.53;user=phone>
Call-ID: 11923@10.33.2.53
CSeq: 1 INVITE
Contact: <sip:100@10.33.2.53>
X-Detect: Request=AMD,CPT
2. The device sends a SIP response message to the remote party, listing the events
in the X-Detect header that it can detect:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.33.2.53;branch=z9hG4bKac5906
From: "anonymous"
<sip:anonymous@anonymous.invalid>;tag=1c25298
To: <sip:101@10.33.2.53;user=phone>;tag=1c19282
Call-ID: 11923@10.33.2.53
CSeq: 1 INVITE
Contact: <sip:101@10.33.2.53>
X-Detect: Response=AMD,CPT
3. The device detects the beep of an answering machine and sends an INFO
message to the remote party:
INFO sip:101@10.33.2.53;user=phone SIP/2.0
Via: SIP/2.0/UDP 10.33.2.53;branch=z9hG4bKac5906
Max-Forwards: 70
From: "anonymous"
<sip:anonymous@anonymous.invalid>;tag=1c25298
To: <sip:101@10.33.2.53;user=phone>
Call-ID: 11923@10.33.2.53
CSeq: 1 INVITE
Contact: <sip:100@10.33.2.53>
X- Detect: Response=AMD,CPT
Content-Type: Application/X-Detect
Content-Length: xxx
Type = CPT
Subtype = Beep
14.5

Answering Machine Detection (AMD)

The device's Answering Machine Detection (AMD) feature can detect whether an outbound
call (SBC or Gateway call) has been answered by a human (including fax) or an answering
machine. The device analyzes the sound (speech) patterns received in the first few
seconds of the call to determine whether a human (live person) or machine has answered
the call. Typically, when a human answers the call, there is a short "hello ..." followed by
silence to wait for the other party to respond. In contrast, when an answering machine
answers the call, there is constant speech (answering message) followed by a beep to
leave a voice-mail message.
When the device detects what answered the call (human or machine), it can notify this
detection type to, for example, a third-party application server used for automatic dialing
applications. The X-Detect SIP header is used for requesting event detection and
notification. For more information, see ''Event Detection and Notification using X-Detect
Header'' on page 204. The device can also detect beeps played by an answering machine
at the end of its greeting message. For more information, see ''Detecting Answering
Machine Beeps'' on page 207. You can also configure the device to disconnect IP-to-Tel
calls upon detection of an answering machine on the Tel side. For more information, see
Enabling IP-to-Tel Call Disconnection upon Detection of Answering Machine on page 214.
The device's default AMD feature is based on voice detection for North American English
(see note below). It uses AudioCodes' sophisticated speech detection algorithms which are
based on hundreds of real-life recordings of answered calls by live voice and answering
Version 7.2 209 Mediant 1000B Gateway & E-SBC
14. Media