Let's see if I can be 3-3 :-)
If the 7730 is connected to a TA-824 system, you need to have 3 elements in programming, an access code that gives you an outside line, 9 works if your lines are properly programmed in system program 400, and 81,82,83 codes work if not. The problem with 8x codes is that it only gets a specific line and if that's busy, it doesn't work.
You also need to turn on the option in programming. Reference the following thread http://www.fixya.com/support/t3120724-forward_calls_outside_number
Carl
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