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.
Initial Configuration:
To configure this feature, the IMG must have an initial configuration on it. Before proceeding verify that ClientView has an initial configuration on it. The Logical Node, Physical Node, and Facilities including IP bearer spans must already be configured to proceed. Verify all initial configuring has been accomplished before proceeding.
Configure SS7 Stack:
An SS7 stack must be configured. The IMG will use the SS7 stack information when placing the ISUP message in the SIP body, therefore when creating the stack ensure the correct information is selected in the stack. Follow next few instructions to configure stack.
Right Click on the Physical IMG object in the object tree of ClientView and select New Signaling. A Signaling Pane will get created.
Right Click on the Signaling object just created and select New SS7. An SS7 StandAlone object will get created.
Right Click on the SS7 StandAlone object created and select New SS7 Stack. An SS7 Stack Pane will get created. Enter the information needed for your specific network. See IMG 1010 - SS7 Stack link for more information on configuring an SS7 Stack.
Configure SIP Signaling for IMG.
Right Click on the Signaling object created above and select New SIP.
In the SIP Pane that appears, configure SIP-T by selecting Yes from Drop Down menu in the 'Enable SIP-T' field. See the IMG 1010 - SIP Signaling Object link for more information on configuring SIP Signaling Pane.
Right Click on the SIP Signaling Object and select New SIP-T Entity. A SIP-T Entity Pane will appear.
In the 'SS7 Stack' field, select from a drop down menu the stack created earlier in this procedure. See IMG 1010 - SIP T Entity link for more information on configuring the SIP-T Entity Pane.
Configure a SIP Profile that includes SIP to SIP-T/SIP-I Interworking as an attribute:
Right Click on the 'Profiles object and select New SIP SGP. Once pane is created, change the SIP Profile ID to something other than '0' by selecting a different ID from the drop down menu. This will allow user to edit the SIP SGP Profile.
Using the IMG 1010 - SIP Profile - 10.5.3 link, edit this pane as per you network.
Right Click on this pane and select New SIP to SIP-T Interworking from drop down menu. See Below.
A SIP to SIP-T Interworking Pane will appear. Select Enabled from the drop down menu in the SIP to SIP-T Interworking Pane. This configures the SIP SGP profile created earlier to be able to enable this feature in the individual channel groups. See the IMG 1010 - SIP to SIP-T Interworking topic for information on how to configure the individual fields within this object pane.
Configure External Gateways (Incoming and Outgoing):
The next step will be to configure the external gateways that will be connected to the IMG.
Right Click on Dialogic IMG EMS and select New External Network Elements. The External Network Elements pane will get created. This is a container object for external gateways.
Right Click on External Network Elements pane and select New External Gateways. From here the individual gateways can get configured.
Right Click on External Gateways object and select New External Gateway. In this example the gateways on the incoming and outgoing side of the IMG will need the SIP to SIP-T profile enabled. See screen capture below on how to enable the SIP to SIP-T profile on the incoming gateway.
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.
Configure Incoming and Outgoing Channel Groups:
For this example, an Incoming and Outgoing channel group will be configured. Both Channel Groups will enable this feature. Follow steps below to accomplish this task
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.
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.