Embodiments of systems and methods for the sending, delivery and receiving of faxes according to particular protocols are disclosed. Certain embodiments may receive a fax from a sender and determine if the ability exists to send the fax over a computer based network according to a particular protocol. If there is no destination associated with the fax number for the protocol the fax may be sent according to the fax number. If, however, there is a destination for the protocol associated with the fax number an attempt is made to send the fax to the destination according to the protocol.