As described earlier, if the fax machine is not in use over the voice/fax channel, it is connected to the PSTN as in the figure above. When in this state, the FAX port is free to receive fax messages over the PSTN. While fax transmission over the PSTN is in progress, the local FAX port is busied out and cannot be accessed by another fax within the Integration network.
To initiate a fax transmission over the PSTN, the user dials the number, presses the START button on the fax machine to start the machine, and sends the message. In essence, this is what the user would normally do when connected directly to the PSTN.
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