IsoFax

Spec sheet

Product

IsoFax is a centralized network fax solution for high-volume fax delivery.Read 8 Oct 2026 · isofax.com

Support

Technical support is available by email and at +1 415-256-2525, press 2.Read 8 Oct 2026 · isofax.com

Founded

1987Read 28 Sep 2026 · isofax.com

Coversheets

IsoFax supports client- or server-generated coversheets, including server-side coversheets for large distribution lists.Read 8 Oct 2026 · isofax.com

Downloads

Access to the Bristol Group Downloads page requires contacting technical support for a password.Read 8 Oct 2026 · isofax.com

Fax capacity

The site lists up to 128 digital fax modems per server, or standard analog fax modems.Read 8 Oct 2026 · isofax.com

Fax over IP

IsoFax 12.2 supports inbound and outbound Fax over IP using the Dialogic Brooktrout SR-140 T.38 stack.Read 8 Oct 2026 · isofax.com

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.Read 8 Oct 2026 · isofax.com

Maker and history

The product is offered by The Bristol Group, Ltd., which says it was founded in 1987.Read 8 Oct 2026 · isofax.com

Queue management

The server monitors submitted fax queues and modem pools, supports multiple queues with selectable priorities, and logs fax activity.Read 8 Oct 2026 · isofax.com

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.Read 8 Oct 2026 · isofax.com

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.Read 8 Oct 2026 · isofax.com

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.Read 8 Oct 2026 · isofax.com

Submission methods

Faxes can be submitted through Windows and Unix GUI clients, scripts using the IsoFax toolkit/API, or SMTP email with MIME attachments.Read 8 Oct 2026 · isofax.com

Supported operating systems

The site lists Linux, Windows, Solaris, HP-UX, and AIX as supported platforms.Read 8 Oct 2026 · isofax.com

Web access

The product description lists web clients alongside GUI clients, routing options, email-to-fax, and APIs.Read 8 Oct 2026 · isofax.com

Plans and prices

Every IsoFax plan and price →

Where Specifiction places it

• Fax Server Software#21 of 237.2