IsoFax

isofax.com · checked 8 Oct 2026

#18 · Fax Server Software

Visit isofax.com ↗ Alternatives IsoFax vs NET SatisFAXtion

How it plugs in

—Public API

NoOpen source

NoFree tier

Signal on Fax Server Software5.1#18 of 23

IsoFax is a centralized network fax solution for high-volume fax delivery.

Pricing

IsoFaxPricing based on number of fax linesOn request

As isofax.com lists them, checked 8 Oct 2026.

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: isofax.com
Price: Not published
Free trial: Not stated
Coversheets: IsoFax supports client- or server-generated coversheets, including server-side coversheets for large distribution lists.
Downloads: Access to the Bristol Group Downloads page requires contacting technical support for a password.
Fax capacity: The site lists up to 128 digital fax modems per server, or standard analog fax modems.
Fax over IP: IsoFax 12.2 supports inbound and outbound Fax over IP using the Dialogic Brooktrout SR-140 T.38 stack.
Founded: 1987
Maintenance terms: Customers under maintenance can rehost an IsoFax server without charge, and US customers with maintenance contracts are entitled to a backup license set.
Maker and history: The product is offered by The Bristol Group, Ltd., which says it was founded in 1987.
Queue management: The server monitors submitted fax queues and modem pools, supports multiple queues with selectable priorities, and logs fax activity.
Routing and retries: Features include least-cost routing across geographically distributed fax servers and retries that resend only failed pages while avoiding calls identified as non-fax calls.
Security statement: The maker describes IsoFax as secure and says T.38 allows private, error-free faxing between an IsoFax server and PSTN gateway or between T.38-capable endpoints.
SIP connectivity: The maker says customers can connect through PBXs and SBCs such as Cisco and Avaya, or directly to T.38-capable SIP trunks including Verizon, CenturyLink, and Sprint.
Submission methods: Faxes can be submitted through Windows and Unix GUI clients, scripts using the IsoFax toolkit/API, or SMTP email with MIME attachments.

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