You will get a message like that you're call cannot be completed as dialed, please hang up and try again.Doesn't look like you have a pattern for dialing 411. When dialing 800 numbers are you dialing a leading 91 to hit the 9.@ Route Pattern?
Probably will need to see detailed CCM traces from the CallManagers that the test phone and the MGCP GW is registered to. This will give an idea of what is happening.