I went to station 10 and entered Intercom *746*, 6, 4, * [this is what the book says is the correct sequence for a 600msec.

I then pressed line #1 and dialed a number, when the person answered, I hit the flash button, that seemed to drop the line (no dial tone) - i pressed the same line button and dialed the second number, when the person answered, I hit the flash button and... nothing. The second # I called is in our office - would that make a difference? Do I need to dial two outside numbers?

I hate to quite bothering you.