posted on Oct, 7 2008 @ 12:20 PM
I'm guessing what it said was, "all trunks are full". A "trunk" is the circuit between the switchboard and the telco office. I'll bet
when you make an outbound call you have to dial a 9 to get an outside line.
If you're at a business with multiple telephone sets, that doesn't mean there's a corresponding number of trunks to the telco central office. So
if you have more requests for an outside line than you have trunks, your switching equipment can return an "all trunks are busy/full" recording.
If the recording is from the telco, you'll hear a series of three tones first. It's possible that the local telco had a problem at their office.
Some radio station running a contest or something loads up all the capacity, but that's rare.