Sip Call Flow Examples Of Event Detection And Notification - AudioCodes Mediant 500L User Manual

For more information on the CPT file, see ''Call Progress Tones File'' on page 793.
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

14.4.3 SIP Call Flow Examples of Event Detection and Notification

Two SIP call flow examples are provided below of event detection and notification:

The following example shows a SIP call flow of the device's AMD and event detection
feature, whereby the device detects an answering machine and the subsequent start
and end of the greeting message, enabling the third-party application server to know
when to play a recorded voice message to an answering machine:
1. Upon detection of the answering machine, the device sends the following SIP
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=z9hG4bKac1566945480
Max-Forwards: 70
From: sut <sip:3000@172.22.168.249:5060>;tag=1c1505895240
To: sipp <sip:sipp@172.22.2.9:5060>;tag=1
Call-ID: 1-29758@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: 30
Type= AMD
SubType= AUTOMATA
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.7.20A.000.038
Content-Type: application/x-detect
Content-Length: 34
User's Manual
Mediant 500L Gateway & E-SBC
208 Document #: LTRT-10532