Hi I have a question about detect tone: I have 2 freeswitch server and I use mod_spandsp to detect tone: 1. I use SIP Phone call to mod_spandsp, it make call to the second freeswitch. 2. Second freeswitch will answer and genarate tone like <action application="playback" data="tone_stream://%%(250,250,480,620);%(500,500,480,620)"/> 3. mod_spandsp will start_detect_tone I have a problem: I create make call from mod_spandsp to second freeswitch I will have 2 session ( channels) 1st session: SIP Phone call to mod_spandsp 2st session: mod_spandsp call to the second freeswitch I try to dectect 1st session, then I can dectect tone But I try to dectect 2st session, then I see that dectect tone don't run What is the problem with 2st session ? Whycan't I detect tone ? And I also problem is I can't detect all tone that I send from second freeswitch and It's too difficult to detect tone B&R Dinh Thuc