To develop fax and integrated voice/fax applications, you need to use fax library functions in conjunction with voice library functions and the Standard Runtime Library functions. For example, specific voice library functions control the hook state of your phone line, receiving and processing touch-tone digits, and so on, while the fax library controls such functions as sending and receiving faxes, and setting fax parameters.
Because a fax resource channel uses the same physical hardware channel as a voice resource channel, voice API and fax API functions may be mixed freely on a channel. Thus, a single channel can process either a voice call or a fax call; however, both voice and fax input/output cannot occur at the same time on the same device channel.
See the function reference examples in this guide to see how Dialogic voice library functions are used in conjunction with fax library functions. Also see section 4.3. Opening and Closing a Fax Channel Device for information on fax channel device operation.
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