It entirely depends on the technology used to interface to the PSTN. > You have not specified what technology/hardware you are using to connect > to the PSTN. > > For instance if you are using POTS(plain old telephone service - analog > copper fed lines), you do not get answer supervision back from the telco.-- > > I am using tdm400 card with one fxo port. I am using analog line so I guess it's POTS "analog cooper fed" line. So it is impossible to distinguish ringing from talking and billsec must start when ringing begin due missing answer supervision from telco ?
Thanks for reply Use Free Software http://www.fsf.org/ ----------------------------------------------- Four essential software freedoms: 1) To study source code 2) To copy program 3) To modify source code 4) To redistribute modified program under condition that new user has all 4 freedoms. Richard M. Stallman
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