Can a TA distinguish between voice and fax calls?
That depends on the sending equipment. If the caller is using an ISDN telephone or G4 fax, information about the type of call is transmitted via the ISDN D channel informing the receiving device whether it’s voice or fax. If the source is an analog telephone, however, there is no way to convey information regarding the type of call until it is answered. Although it is possible, TA permitting, to pass a fax call from a telephone to a fax machine if you hear the beeping tones of a fax machine, optional Dial-In telephone numbers offer a more convenient solution.
