<div dir="ltr">Hello all,<div><br></div><div>Our telco recently changed their call progress tones:</div><div><br></div><div>Dialtone: 450Hz continuous</div><div>Ringback tone: 450Hz/1 sec ON 4 sec OFF</div><div>Busy tone: 450Hz/360ms ON 360 OFF</div>
<div>Attn: 950Hz/continuous (0db)</div><div><br></div><div>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. <a href="http://permalink.gmane.org/gmane.comp.telephony.freeswitch.user/36531">http://permalink.gmane.org/gmane.comp.telephony.freeswitch.user/36531</a></div>
<div>Questions:</div><div>1. What state will FreeTDM go when it detects 450Hz? Ringing or Busy? I presume it would be Ringing or it would hangup.</div><div>2. Can I use tone_detect to distinguish them? Can I use a series of tone_detects? Any suggestion where to go?</div>
<div><br></div><div>If not ...</div><div>My last recourse will be - wait for the Attn tone. But ... will FreeTDM jump to hangup the call upon detecting this?</div><div><br></div><div>Thanks,</div><div>/Nandy
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