Hello, I have been working in a MFC/R2 signaling library that eventually could be used in FreeSwitch, the library is working pretty well for the R2 México variant and it should be easy to add new protocol variants. I am just missing the handling of some tones (congestion, busy, call free of charge) but that will be coming soon. During my testing I have been using spandsp to detect and generate the required 15 MF signals. As you may know, spandsp is GPL and not something I plan to depend on. I want to move from spandsp to libteletone. As a first step I created a small test case thatn generates forward MF tones with spandsp and then try to detect them using both spandsp and libteletone to compare results. The test case is very simple (100 lines), its source code can be found here: http://pastebin.com/m7156bc21 If you run the test case you will see that spandsp can detect all of the 15 MF tones using just 320 samples for each one, however, libteletone, apparently (probably because I am not using it properly) can only detect 9 tones using different large amount of samples (4480, 3520 etc), the remaining 6 tones are not detected at all even after reaching the 8000 samples limit I specified. Can somebody advice about what could be possibly wrong in how I use libteletone to detect MF signals in the test case? Any hints will be appreciated. Kind Regards, Moisés Silva -- "I do not agree with what you have to say, but I'll defend to the death your right to say it." Voltaire