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By default, if the IMG 2020 receives a cause code on the outgoing leg of a call, the received cause code will be interworked and that same cause code will be transmitted in a response to the incoming side. However, the IMG 2020 has the ability to manipulate the received cause code on the outgoing leg and transmit a modified cause code in the response to the incoming leg. This functionality is supported between any protocol supported on the IMG 2020. The examples below display the configuration needed to modify a received cause code coming from the SS7 protocol modify it and then transmit the modified code to the SIP protocol as a SIP Call Request Failure code.
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Right click on the Routing Configuration object and select New Cause Code Tables. No configuration is needed here. The cause code tables object is a container object. Refer to the Cause Code Tables topic for more information on this object.
Right click on the Cause Code Tables object and select New Cause Code Table. Either accept the default name or enter a name in the Name field that describes the Cause Code Table being configured. In this example the cause code table was labeled CCTbl_ConvCauseCode.
Right click on the Cause Code Table and select New Cause Code Table Element. In the Criteria Values field select from the drop down menu the cause code that the IMG 2020 will match on. In this example the cause code 019 No Answer from User was selected.
In the Route Action Type field, select Cause Code from the drop down menu.
In the Outgoing Cause Code field select the Call Request Failure Code that will be sent back to the SIP network. In this example, the Call Request code of 480 - Temporarily Unavailable was selected. Refer to the screen capture below.
Note: The procedure describes how to modify a received cause code received from the SS7 leg and transmit a modified cause code back to the SIP leg. If however the Cause Code received does not need to be modified, there is no need to configure the Cause Code Table. The IMG 2020 will automatically interwork the received cause code from SS7 to the Call Failure Request code in SIP using the default mappings detailed in RFC 3398 and described in the Cause Code Mappings topic in this document.After modifying the Cause Code Table Element, the Cause Code Table object in the configuration tree will have a yellow exclamation point embedded in the icon. This indicates the configuration has not been sent to the IMG 2020 yet. Click on the Cause Code Table object and then click on the Download Routing Table button and the cause code table information will get sent to the IMG 2020. At this point the exclamation point will disappear.
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