CUCM 6.1.5 External Calls Not Getting Through

My cucm is showing a strange behavior which i am struggling to diagnose so far. External calls sometime go through PSTN, other times they don't go through! I checked PSTN gateway and there seems to be ok because other remote sites can make external calls only my headquarters is experiencing this problem. I have 4 sites and all have their own cme. When i boot for instance my gateway it works temporarily but then calls(external) stop working. DNA information says that a specific pattern is blocked but calls go through sometimes, that's strange!

Fidel Quiteculo Soares

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