AudioCodes Mediant 1000B User Manual page 516

Mediant 1000B Gateway & SBC
The NOTIFY message contains the XML body with call identifiers (call-id and tags).
However, as the application server is located in the external network WAN and the SIP
clients behind the device, the call dialog information sent by the application server reflects
only the dialog between the device and itself; not that of the involved SIP clients. This is
due to, for example, the device's topology hiding (e.g., IP address) of its LAN elements.
The device resolves this by replacing the call identifiers received from the application
server with the correct call identifiers (e.g., user A and user B). Thus, users subscribed to
the service can receive relevant NOTIFY messages from the device and use the service.
Figure 29-2: Interworking NOTIFY XML Body for Application Server
To enable this feature, set the 'SBC Dialog-Info Interworking'
(EnableSBCDialogInfoInterworking) parameter to Enable. When this feature is disabled,
the device forwards the NOTIFY message as is, without modifying its XML body.
Below is an example of an XML body where the call-id, tags, and URIs have been
replaced by the device:
<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info"
version="10" state="partial"
entity="sip:alice@example.com">
<dialog id="zxcvbnm3" call-id="67402270@10.132.10.150"
local-tag="1c137249965"
remote-tag="CCDORRTDRKIKWFVBRWYM" direction="initiator">
<state event="replaced">terminated</state>
</dialog>
<dialog id="sfhjsjk12" call-id="67402270@10.132.10.150"
local-tag="1c137249965"
remote-tag="CCDORRTDRKIKWFVBRWYM" direction="receiver">
<state reason="replaced">confirmed</state>
<replaces
call-id="67402270@10.132.10.150"
local-tag="1c137249965"
remote-tag="CCDORRTDRKIKWFVBRWYM"/>
<referred-by>
sip:bob-is-not-here@vm.example.net
</referred-by>
<local>
<identity display="Jason Forster">
sip:jforsters@home.net
</identity>
<target uri="sip:alice@pc33.example.com">
<param pname="+sip.rendering" pval="yes"/>
</target>
</local>
User's Manual 516 Document #: LTRT-27034