Fax servers enable users to send and receive faxes as easily as emails, using either the same email application or a web-based interface to handle sending the messages.
All fax uses the T.30 standard, set by International Telecommunications Union, which handles how a fax call is set up, processed and shut down. A related protocol, T.4, details fax sizes, compression methods and other important aspects. Then there are two fax standards for Internet faxing: T.37, a standard for store-and-forward faxing (like email) which doesn’t support confirmations in all cases, and T.38, a real-time fax standard that uses spoofing techniques to adjust for the timing variances that occur on packet-switched networks (compared with public switched telephone network [PSTN]). Conventional fax servers and FoIP servers offer the same exact capabilities to end users although FoIP servers offer enterprises advantages over conventional fax servers including virtualization, centralization of fax servers, and less expensive disaster recovery solutions.