Fax passthrough for a system that includes super G3 fax machines

摘要

A method and system for fax passthrough that can detect fax calls and which can distinguish between fax calls and modem calls. Both V.21 flags and the CM fax signals are detected to determine if a call is a fax call. If a call is from a G3 fax machine, the v.21 flags will be detected. On the other hand if the call is from a SG3 fax machine the CM fax signal will be detected. The method and system therefore detects fax calls and it distinguishes between fax and modem calls in a fax passthrough system.