Hi, I've got a single port FXO card which works really well with FS. I even got Zaptel patched with OSLEC which eliminted the little echo I had. The only trouble I'm left with is that when I call my house and let it ring twice then hangup, FS would never detect that the remote side hanged up. I figured my telco doesn't vary the signal levels on hangup so my only choice is detecting hangup by tones. I decided to try the tone_detect app as follows: <action application="tone_detect" data="busy 425 r +2000 hangup user_busy"/> Here is the tones data from the ITU document: Argentine Republic Busy tone - 425 0.3 on 0.2 off Congestion tone - 425 0.3 on 0.4 off Dial tone - 425 continuous End of three party service tone - 950/1400/1800 1x(3x0.33 on) Ringing tone - 425 1.0 on 4.0 off Service activated tone - 425 1.0 on 0.25 off Warning tone - operator intervening 1400 5x0.1 on 1.9 off Waiting tone - 425 0.4 on 0.2 off 0.4 on 4.0 off Call waiting tone - 425 0.3 on 10.0 off The tone_detect app works mostly fine, except that it sometimes "detects" a busy tone right in the middle of a phone call. I say "sometimes" because I can often have an hour-long conversation without a problem. Call waiting is disabled on the line. Would it work better if I removed the tone_detect app and setup the right info in tones.conf? I tried looking at the only country setup in tones.conf (US) while comparing to the ITU document, and there are some numbers in tones.conf that don't make sense which makes it hard for me to figure out what I need to put in tones.conf. Thanks in advance for any help! - Gonzalo