| 摘要 |
Signal-type dependent real-time fax Relay. For example, a system for delivering substantially in real-time a fax call from a gateway to an Internet Protocol (IP) network; wherein the fax call comprises: (a) analog signals of fax negotiation and control belonging to a first type of fax signals, and (b) half-duplex analog signals modulated according to a modulation scheme selected by fax terminals for fax image transfer belonging to a second type of fax signals; wherein the system comprises: a module for distinguishing between the first type of signals which are received at the gateway and the second type of signals which are received at the gateway; a module for demodulation and transferring signals belonging to said first type from said gateway to said IP network, and a module for transferring signals of said second type from said gateway to said IP network either after being demodulated or after being Pulse Code Modulation (PCM) encoded based on a predetermined condition; wherein the system is to determine, on per-signal basis, how to process sampled input of fax signals; wherein the system is to select, on per-fax-call basis, whether to transfer fax signals belonging to said second type after being demodulated or after being PCM encoded; wherein, if PCM encoding is used in the delivering of a fax signal, then the system is to initiate the PCM encoding; wherein the system is to switch, within a fax relay session, from or to utilizing a PCM-encoded signal stream, to or from, respectively, utilizing a demodulated data stream. |
