In the United States, what sequence of numbers do we need to enter in the address book?
For example: You specify the area code as following settings in Joyfax Server(Make sure that you have checked Auto. remove area code for local calls.)

and your contact phone number is +1(886)2344 5678, the phone number you enter in address book:

and your contact phone number is +1(886)2344 5678, the phone number you enter in address book:
Phone number | Dial as |
+1 (866) 234-5678 | 2345678 (local call) |
1-886-234-5678 | 2345678 (local call) |
886-234-5678 | 2345678 (local call) |
(886) 234-5678 | 2345678 (local call) |
8662345678 | 2345678 (local call) |
2345678 | 2345678 (local call) |
(313) 234-5678 | 13132345678 (long-distance call) |
1-823-456-7890 | 18234567890 (long-distance call) |
823-456-7890 | 18234567890 (long-distance call) |
+44 (20) 664000 | 0114420664000 (international call) |
+44-20-664000 | 0114420664000 (international call) |
So, the first six phone number from the above table can be used.
Note: The Dialing & area code rules will affect this, for more please see...