Hello all, Our telco recently changed their call progress tones: Dialtone: 450Hz continuous Ringback tone: 450Hz/1 sec ON 4 sec OFF Busy tone: 450Hz/360ms ON 360 OFF Attn: 950Hz/continuous (0db) The way I understand it, FXO listens for the dialtone then sends DTMF tones. After this, it expects either the Ringback or Busy tone. I read Michael Collin's post that FreeTDM doesn't detect (as of now) cadence. http://permalink.gmane.org/gmane.comp.telephony.freeswitch.user/36531 Questions: 1. What state will FreeTDM go when it detects 450Hz? Ringing or Busy? I presume it would be Ringing or it would hangup. 2. Can I use tone_detect to distinguish them? Can I use a series of tone_detects? Any suggestion where to go? If not ... My last recourse will be - wait for the Attn tone. But ... will FreeTDM jump to hangup the call upon detecting this? Thanks, /Nandy