Version 7.0 221 Mediant 3000
User's Manual 15. Media
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
15.5 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 216. 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 218. 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 225.
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
machines in English. The algorithms are used to detect whether it's human or machine
based on voice and silence duration as well as speech patterns. The algorithms of the
language-based recordings are compiled into a file called AMD Sensitivity. This file is
provided by default, pre-installed on the device.
To Next Page
Loading...
Need help?
General
