12 May
1993
12 May
'93
12:52 a.m.
That means your office is served by a PBX. With PBX service you have some incoming trunks and outgoing trunks (technically they are lines, but let's ignore that). The number of lines in your company is much greater than the number of incoming and outgoing trunks. The ANI data is the line id of your outgoing trunk. Incoming calls must pass your extension id and connect through an incoming trunk. Neil