AudioCodes Mediant 3000 User Manual page 220

2. Upon detection of the start of voice (i.e., the greeting message of the answering
machine), the device sends the following INFO message to the application
server:
INFO sip:sipp@172.22.2.9:5060 SIP/2.0
Via: SIP/2.0/UDP 172.22.168.249;branch=z9hG4bKac482466515
Max-Forwards: 70
From: sut <sip:3000@172.22.168.249:5060>;tag=1c419779142
To: sipp <sip:sipp@172.22.2.9:5060>;tag=1
Call-ID: 1-29753@172.22.2.9
CSeq: 1 INFO
Contact: <sip:56700@172.22.168.249>
Supported: em,timer,replaces,path,resource-priority
Allow:
REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,I
NFO,SUBSCRIBE,UPDATE
User-Agent: Audiocodes-Sip-Gateway/v.6.80A.227.005
Content-Type: application/x-detect
Content-Length: 34
Type= PTT
SubType= SPEECH-START
3. Upon detection of the end of voice (i.e., end of the greeting message of the
answering machine), the device sends the following INFO message to the
application server:
INFO sip:sipp@172.22.2.9:5060 SIP/2.0
Via: SIP/2.0/UDP 172.22.168.249;branch=z9hG4bKac482466515
Max-Forwards: 70
From: sut <sip:3000@172.22.168.249:5060>;tag=1c419779142
To: sipp <sip:sipp@172.22.2.9:5060>;tag=1
Call-ID: 1-29753@172.22.2.9
CSeq: 1 INFO
Contact: <sip:56700@172.22.168.249>
Supported: em,timer,replaces,path,resource-priority
Allow:
REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,I
NFO,SUBSCRIBE,UPDATE
User-Agent: Audiocodes-Sip-Gateway/v.6.80A.227.005
Content-Type: application/x-detect
Content-Length: 34
Type= PTT
SubType= SPEECH-END
4. The application server sends its message to leave on the answering message.

The following example shows a SIP call flow for event detection and notification of the
beep of an answering machine:
1. The device receives a SIP message containing the X-Detect header from the
remote application requesting beep detection:
INVITE 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: 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:
User's Manual 220
Mediant 3000
Document #: LTRT-89730