When a telephone company ports your number to another company, but fails to repoint there network to the The public switched telephone network (PSTN) so that people from other networks can call you but people on their network get a disconnected notice
I been on hold all day attempting to explain this issue of incomported. My mother calls me and gets a disconnected notice, but I call my number from my cell or work or a neighbors home and it rings through fine. My mother is with (A LARGE CABLE AND VOICE PROVIDER WHO RAISES RATES AT RANDOM), I was till I switched phone companies, for a better deal. Thank goodness I can put this word on the web so when it happens to anyone else, it is easier to explain.
by THEPHONEGUY October 03, 2009