Re: @AC Funny... but no.
"(Yes you can do this. All digital switches and cross connects can do this.) [I wrote some of the code... ]
What digital switches? You wrote code for ALL of them?
Are you on about a PBX? A Network switch? A carrier switch?
Do you mean "Digital", as in the 1980's technology or something that uses 1's and 0's?
Please elaborate. I yes I'm fully aware of how to intercept various phone systems.