Limit outgoing calls, all calls start with 0,9,or some other number : next, limit some call area 063,064 or some other : next, limit all calls except one
and some other functions and limiter is with PIC16F84 and MT8870.
Limit outgoing calls, all calls start with 0,9,or some other number : next, limit some call area 063,064 or some other : next, limit all calls except one
and some other functions and limiter is with PIC16F84 and MT8870.
When you are dialing a number, you are already making an outgoing call, now maybe you are telling me is limit, international call, domestic long distances?
Yes the blocker must have next function:
-Block all calls starts with nr.0, or nr.1, or.........nr.9
-Block all calls starts with call area ( 0 X X ) ( X are numbers from 0-9)
-Block all calls except one
-Block all calls
-Must use power from tel. line
All you need is the IC that I am looking for my friend. MT8888 or MT8870, but I think it can't be powered by the phone line alone, just like your caller ID phone, you need batteries for it. Just interface it to a microcontroller then have it recognize the first number you dialed.
you need to study about DTMF and you need to isolate the phone from the phone line. taking over the phone function, monitor the phone keypress by decoding the DTMF. if the key is correct, release the phone line and pass it to the phone.
you need to study about DTMF and you need to isolate the phone from the phone line. taking over the phone function, monitor the phone keypress by decoding the DTMF. if the key is correct, release the phone line and pass it to the phone.