Esker VSI-FAX
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Esker VSI-FAX is a fax server software system produced by Esker Inc., which is based in the USA and has offices in seven other countries. The system is aimed at small-to-medium-sized businesses; the company also produces Esker Fax which is aimed at bigger enterprises.
VSI-FAX is available for Unix/Linux and Windows platforms. Included in the system are several APIs which facilitate embedding faxing functionality into application software. The server can also be accessed via conventional means, including e-mail, virtual printer, and special client software.