I recently inherited the telecommunications issues for my company. We're using a Merlin Legend system to which I have access via SPM and the console. My question has to do with 800 numbers. There are a handful of 800 numbers that we cannot dial. The local carrrier answers with a recorded message stating "77-4 the number you have dialed is invalid or blocked from your area code". The majority of 800 work as expected. Any idea how I can correct this. I have been told by the local carrier that it has to do with my CSU/DSU.. which I have no idea how to fix. Thanks in advance.