We have pruchased a HP Laserjet 630Z (high end unit) and it does have three options, analog fax/network fax and Internet faxing abilities.. The manual states
In the Internet Fax Service Settings
area, enter the information from your service provider in the Internet Fax Provider Domain
and the T37 Prefix
Enter the Default Fax Account E-mail Address
. If you want to use the email address for the user who is signed in to the product, select the appropriate box.
Select a File Format
Choose whether to enable the If available, use the signed in user’s e-mail address as the Fax Account address
If you are using a service in North America, choose whether to enable the Auto complete to North American Numbering Plan (NANP) format using area code
option. If selected, enter the area code in the field provided.
to save the settings.