Version 7.2 199 Mediant 1000B Gateway & E-SBC
User's Manual 14. Media
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.7.20A.000.038
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:
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
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