A question arose about the purpose of the Call Monitoring option under the TI Control/Status Properties window.
The Call Monitoring setting should be enabled if a handset is connected in addition to the phone line. It basically changes the monitoring tolerances used to indicate a line fault. If there is not a handset connected, and Call Monitoring is disabled, a fault condition will be triggered.
The STC-2 card has four total jacks; two are assigned to each phone line in the card. This follows the approach that was used on the AudiaFLEX TI-2 card. However, when we look at the TesiraFORTE TI, we find that only a single RJ-11 jack is provided. This is likely due to the fact that most installations will not need a locally connected handset. If the local handset is required, an inexpensive RJ-11 splitter can be utilized.