‘Hot Dial’ is a specially configured Exchange Feature, where as soon as the phone goes ‘Off Hook’ it automatically dials a pre-configured number. The Memcom automatically tests the phone line periodically; this can automatically cause a call to be made.  In these situations, it is necessary to turn off the Line Monitoring. To enable Hot Dial calling in the Memcom, use **4 as alarm number 1 and turn off line monitoring  this is done by entering Memcom menu, ‘H/W Monitoring’  and un-ticking  phone line or changing option H/W mon 39 to 35 on the earlier model.