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Up until software version 10.5.2, the IMG supports SIP-T/SIP-I for interworking between SIP and SS7 ISUP. A call that originates in the PSTN and is then Interworked into a SIP network places ISUP messaging into the SIP message body. When the call finally gets to its destination the ISUP information in the SIP body is extracted from the SIP message and placed back into its ISUP messaging so the PSTN can route the call. In software 10.5.2 a feature was added to allow the IMG to accept a SIP message which originally has no ISUP information in it and create a SIP-T/SIP-I message which has the ISUP information embedded in its SIP body. The procedure below will explain how to configure the IMG to accept the incoming SIP message and send out a SIP-T/SIP-I message.
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Note: In this example SIP to SIP-T profile will be configured on both Incoming and Outgoing Gateways. This way all responses on the incoming side will have ISUP messaging embedded and all SIP messaging on the Outgoing side will have ISUP messaging in them. (Now SIP-T/SIP-I messaging)
See the IMG 1010 - External Gateway Topic on how to configure the rest of the fields in the External Gateway Pane
Configure an External Gateway on the Outgoing side of the IMG also. Follow steps above to accomplish configuring an External Gateway on the Outgoing side.
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Right Click on Dialogic IMG EMS and select New Routing Configuration. This is a container object. The Channel groups are configured under this object.
Right Click on the Routing Configuration Object and select New Channel Groups. A Channel Groups Pane will appear. The individual channel groups are configured under this object.
Right Click on Channel Groups object and select New Channel Group. A channel Group Pane will appear, Enter a Name and select SIP as the Signaling Type. See the IMG 1010 - Channel Group Topic for more information on configuring the Channel Group Pane. In this example, Route and Translation are not configured. Routing and Translation is explained in multiple other topics In this document.
Right Click on the Channel Group just created and select New IP Network Element. This is the network element that will be connected to the Channel Group just created. Select from drop down menu the Gateway that will connect to the incoming side of IMG. The drop down list includes all the entities that would be considered a Network Element. See screen capture below.
Create a second Channel Group for the Outgoing side. And connect the external gateway to it as explained above.
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At this point, the IMG is configured to accept SIP signaling on the incoming side and send out SIP signaling with ISUP messaging in the body of the SIP message (SIP-T/SIP-I). Also, by enabling SIP-T Interworking on the incoming side the responses sent back to the Gateway on the Incoming side will have ISUP messaging in the body of the SIP responses. The procedure above is solely for explaining the basic configuration of the SIP to SIP-T interworking feature. Information such as routing, translation, and other panes can be found on their respective topic links in this online documentation.