Version 5.6
345
November 2008
SIP User's Manual
7. IP Telephony Capabilities
The SIP call flows below show an example of implementing the device's AMD feature. This
scenario example allows a third-party Application server to play a recorded voice message
to an answering machine.
1.
Upon detection by the device of the answering machine, the device sends a SIP INFO
message to the Application server:
INFO sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 172.22.168.249;branch=z9hG4bKac1566945480
Max-Forwards: 70
From: sut <sip:[email protected]:5060>;tag=1c1505895240
To: sipp <sip:[email protected]:5060>;tag=1
Call-ID: [email protected]
CSeq: 1 INFO
Contact: <sip:[email protected]>
Supported: em,timer,replaces,path,resource-priority
Allow:
REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUB
SCRIBE,UPDATE
User-Agent: Audiocodes-Sip-Gateway-IPmedia 260_UN/v.5.20A.040.004
Content-Type: application/x-detect
Content-Length: 30
Type=
AMD
SubType=
AUTOMATA
2.
The device then detects the start of voice (i.e., the greeting message of the answering
machine), and then sends the following to the Application server:
INFO sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 172.22.168.249;branch=z9hG4bKac482466515
Max-Forwards: 70
From: sut <sip:[email protected]:5060>;tag=1c419779142
To: sipp <sip:[email protected]:5060>;tag=1
Call-ID: [email protected]
CSeq: 1 INFO
Contact: <sip:[email protected]>
Supported: em,timer,replaces,path,resource-priority
Allow:
REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUB
SCRIBE,UPDATE
User-Agent: Audiocodes-Sip-Gateway-IPmedia 260_UN/v.5.20A.040.004
Content-Type: application/x-detect
Content-Length: 34
Type=
PTT
SubType=
SPEECH-START
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