Put a toner on the line, call that line with your mobile, once connected hang up with the mobile and see if the toner light flashes off then on again.
If the light momentarily went off then the carrier is doing their job.
-call that line with your mobile, once connected hang up, note how long it took for the call to disconnect by looking at the arrow on the digital set.
-Play with the different Dicson timers in hardware.
-Replace the card if need
-If they have 2 cards you could test the other lines on the other card and if problem disappears then replace the bad card.
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