Check for this likely cause: The Address Resolution Protocol (ARP) table of your router may need to be flushed. The ARP table associates IP addresses to MAC addresses. If another device has used this IP address - for example, if a turn-up tech used his laptop to verify the address - then the ARP table might still associate the IP address with an old MAC address. If the ARP table doesn't associate the remote's MAC address to its IP address, the router won't let packets get through.
What's going on: Remote sites often aren't allowed to call long-distance. If the remote site and the NOC are in different area codes, you may not be able to connect.
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