The Voice/Fax Switch Module is an optional module which is supported on the Universal Analog Voice Module (UAVM). It combines the functions of an FXS-type interface module with a line-sharing/fax-sharing unit. As such, it allows a fax machine to share the voice/fax channel with a telephone set or key telephone system. In addition, it allows the same fax machine to be shared between the voice/fax channel and the Public Switched Telephone Network (PSTN). Both switched and "force connect" (with Hoot-and-Holler and AutoRingDown configured) modes are supported.
If you are operating under the auspices of BABT, acquaint yourself with their
operating requirements by consulting the 
Passport 4400 Hardware Installation Manual 800-1951.
The following topics are discussed in this section:
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