US Patent 7450702 Call screening for fax telephone numbers

A system for providing call processing services to one or more customers includes a network configured to receive, from a first client, a fax transmission attempt intended for a second client associated with a customer. A network call processor within the network is configured to screen a first fax telephone number corresponding to the first client and a second fax telephone number corresponding to the second client and determine whether to deliver a fax transmission to the second client.