CLASS 2 MODEM SUPPORT

The system includes a driver for modems that conform to TIA/EIA-592 draft SP-2388-A of August 30, 1991. Unfortunately, because this was only a draft, there are many modems that claim to conform to this document, but which diverge in sometimes subtle ways.

The Class 2 driver has been extensively tested with a wide variety of Class 2 modems. The software attempts to work around many incompatibilities and mistakes in modem firmware. A common problem that requires special attention is that some modems are incapable of accepting an `AT+FDIS` command to set the session parameters between the time a call is placed and a page is transmitted. Modems with this sort of problem may ignore the `AT+FDIS` command which causes incorrect session parameters being used to interpret the page data (often resulting in ``squished pages''), or abort the session, returning a `+FHNG:` status message to the host. If you encounter this problem use the `Class2DDISCmd` configuration parameter to enable workaround support in the fax server; e.g.

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    Class2DDISCmd:	AT+FDIS

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HylaFAX table of contents.