Ip-To-Ip Transcoding - AudioCodes Mediant 1000 User Manual

5. SIP MESSAGE 5: 10.33.24.1:5060 -> 10.33.2.40:5060
BYE sip:103@10.33.2.40 SIP/2.0
Via: SIP/2.0/UDP 10.33.24.1;branch=z9hG4bKacFhtFbFR
Max-Forwards: 70
From: <sip:annc@10.33.24.1>;tag=1c1528117157
To: <sip:103@10.33.2.40>;tag=1c2917829348
Call-ID: 1414622340oZZq@10.33.2.40
CSeq: 1 BYE
Contact: <sip:10.33.24.1>
Supported: em,timer,replaces,path
Allow:REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,IN
FO,SUBSCRIBE,UPDATE
User-Agent: Audiocodes-Sip-Gateway-TrunkPack
1610/v.4.60AOH.006.002D
Content-Length: 0
6. SIP MESSAGE 6: 10.33.2.40:5060 -> 10.33.24.1:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.33.24.1;branch=z9hG4bKacFhtFbFR
From: <sip:annc@10.33.24.1>;tag=1c1528117157
To: <sip:103@10.33.2.40>;tag=1c2917829348
Call-ID: 1414622340oZZq@10.33.2.40
CSeq: 1 BYE
Contact: <sip:103@10.33.2.40>
Supported: em,timer,replaces,path
Allow:REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,IN
FO,SUBSCRIBE,UPDATE
Server: Audiocodes-Sip-Gateway-4.0 GA/v.4.0 GA
Content-Length: 0
10.3

IP-to-IP Transcoding

Transcoding is a technology that is used to bridge (translate) between two remote network
locations, each of which uses a different coder and/or a different DTMF and fax transport
types. The device supports IP-to-IP Transcoding. It creates a Transcoding call that is
similar to a dial-in, two-party conference call. The SIP URI in the INVITE message is used
as a Transcoding service identifier. The Transcoding identifier can be configured using the
ini file (parameter TranscodingID) or Web interface (refer to ''Configuring the IPmedia
Parameters'' on page 242.
It is assumed that the device is controlled by a third-party, Application server (or any SIP
user agent) that instructs the device to start an IP Transcoding call by sending two SIP
INVITE messages with SIP URI that includes the Transcoding Identifier name. For
example:
Invite sip:trans123@audiocodes.com SIP/2.0
The left part of the SIP URI includes the Transcoding ID (the default string is 'trans') and is
terminated by a unique number (123). The device immediately sends a 200 OK message in
response to each INVITE.
Each of the Transcoding SIP call participants can use a different VoIP coder and a different
DTMF transport type, negotiated with the device using common SIP negotiation.
Sending a BYE request to the device by any of the participants, terminates the SIP session
and removes it from the Transcoding session. The second BYE from the second participant
ends the Transcoding session and releases its resources.
SIP User's Manual 494
Mediant 1000 & Mediant 600
Document #: LTRT-83303