[throwa]

Thanks for this comment. Where can one get blocks of fax numbers. You mentioned CLEC's get block of phone numbers, is there a similar system for allocating blocks of fax numbers. For instance HelloFax usually assign Fax numbers to customers based on area code. Where do they get the fax numbers from?

Many thanks.

[agwa]

Same way - fax numbers are no different from regular phone numbers in the PSTN. (That said, once VoIP enters the equation, you want to use a fax-friendly codec like T.38.) HelloFax is surely not their own CLEC so they're buying phone numbers (with a monthly cost) from one or more CLECs or CLEC resellers. If you know a HelloFax phone number you can look up who the CLEC is using this form:

http://www.alcazarnetworks.com/data_services_lnp_lrn.php