Thanks Pythonpoole,
Yes, that is what I have currently got setup but unfortunately our Telco charges for every call that is forwarded when busy. I am trying to look at ways of answering mulitple incoming PSTN calls without being charged $0.25 AU for every call forwarded to my VOIP line.
I could change our phone number to a VOIP number but I am not that keen in doing this, just in case we lose power or our ADSL line goes down.
The other option is to have a 1300 number that costs $15AU a month and calls are timed after 2 minutes and we pay for the cost of the incoming call. This way customers ring the 1300 number from anywhere in Australia for the cost of the local call and the Telco transfers the call to 3 numbers of your choice. However, we would also have to spend money on our signage to change the number.
Any other ideas?
Cheers
DazzleMe