I have a CS1k (main switch) tied to a Hipath 4000. When dialing from the CS1K to the Hipath 4000 there is no issue but when trying to dial the Hipath 4000 I can't dial to an extension on the CS1K but I'm able dial from the Hipath to the local and long distance T1's that are connected to the CS1K. Any ideas on what's happening?