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Terminating ISDN calls return a Q.850 Cause Code when they end. We can use these codes to determine whether or not to reroute the call to another signalling group via additional configured entries in the Call Route Table. A Cause Code Reroute table contains one or more Q.850 Cause Codes which, when matched, trigger a reroute. To use a table created here, select it from the Cause Code Reroute field in a Call Routing Table entry.
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When there are multiple redirects of a call, the SBC operates as follows: A redirect can be a SIP 3xx or a Cause Code Reroute. If there is a redirect of a call, all works well. If there is more than one redirect, the SBC goes back to using the original Calling and Called numbers. In the example below where the Calling number is 1234567 and the Called number is 7654321:
If this call, then, fails and is Cause Code rerouted, the SBC uses the Calling number 1234567 and the Called number 7654321 for the next attempt. In other words, if a redirect happens on the outbound side, the SBC redirects the call to a new number. If the call disconnects with a Cause Code in the Cause Code Reroute table (this happens when the SBC clears the call back to the inbound side), the SBC reroutes the original call, not the redirected outbound call. Hence, the SBC uses the original numbers as the Called and the Calling numbers for this call, not the redirected numbers. |
Working with Cause Code Reroute Tables
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