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External EX-60 redial missed call failed

Here is the current topology:

CUCM ------ VCS-C --- [FW] --- VCS-E --- [cloud] --- EX-60 (SIP)    

     |

     |

CUBE

     |

SIP Trunk to ATT

When an outside caller calls his EX-60 and he misses the call, when he goes to redial the number by selecting the missed call, the call fails.

For an internal EX-60 registered to VCS-C, I have setup a search rule that strips the +, prefixes a 9, and sends it to a local zone to CUCM.

               This works just fine

On the VCS-E we have a search rule that strips the +, prefixes a 9, and sends it to TraversalServer.

I noticed under search history that the call is is not hitting our search rule, it is hitting CallsToUnkownIPAddresses via the DefaultZone (Direct).

               I assume this is because the call comes in as +1234567890@IP of CUCM Sub, which is unknown to the VCS-E?

               The error reported is Temporarily Not Available

How can I get the VCS-E to not route this call to the DefaultZone and hit the search rule I created?

How can I have the VCS-E trust that the IP of CUCM Sub is not an unkown IP address?

I was thinking I could replace the @IP of CUCM Sub with @ourlocaldomain.com and send it to the traversal, but then I would have to have a seperate search rule on the VCS-C which replaces @ourlocaldomain.com with @IP of CUCM Sub.

Is there something I am missing here?

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