I have seen a lot of services on the internet, but it is very expensive. Are there voip solutions out there? Basically I want to have multiple fax numbers in each state where my customers can fax documents to me and then they can receive them in a pdf format. Any ideas? What's the lowest cost to do this for my customers?
I may need 100 telephone numbers for my customers. I have a nationwide customer base. Jfax and Myfax may be too expensive.

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Best way to do this is try an Internet fax provider. With MyFax you can fax with up to 3 different e-mail addresses. You send and receive faxes through your e-mail and the files can be converted to PDF. Its not very expensive - only $10 a month and very reliable. Take a look and see if its for you http://www.myfax.com
-Would an 800 number work for you? If so, MyFax offers them for no extra charge.