Being "old school" I tend to think that dialing outside numbers should
always be preceeded by "9" and then the number. However that was before
"call back" or missed calls were invented. The problem is that the CID
from these calls can't be just dialed out through a typical dialing plan
eg. a caller CID of 705 xxx xxxx needs a call back but you dialplan needs
9+1+705 xxx xxxx to get an outside line. If we set up a dial plan thats
more like the PSTN then local calls (416,647,905) can be set in the
dialplan  directly and long distance calls can have "1+" dialing (no
problem so far)
Most ITSP don't want the "1" so that would have to be discarded in the
dial plan.
Extensions can be in any range starting with 2,3,5,7 and 8. I like 2xx or
3xx.
International call begins with "011" and if anyone knows what the CID
looks like please let me know.

Dialplan.

1|NXXNXXXXXX - Longdistance
416NXXXXXX - Local
647NXXXXXX - Local
905NXXXXXX - Local

2XX - Local Extensions
3XX - OPX

Now what happens if someone from New York wants a call-back ?
Will the call-back number 212NXXXXXX conflict with Extension 212
or is there an elegant workaround?


-- 
Henry L. Coleman.
Web: www.voip-pbx.ca
Tel: 1 866 415 5355

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