Hello everyone, I'm trying to fine tune call progress tone using tone_detect_start. I set spandsp.conf.xml: <descriptions log-level="2"> Log shows these lines: Tone segment f1=-1, f2=-1, duration=336ms How can I tell which frequency represents -1, 4 or 5? What is the frequency assignment of silence? Let's use North America as an example. /Nandy <!-- North America --> <descriptor name="1"> <tone name="CED_TONE" description="ANS / ANSam"> <element freq1="2100" freq2="0" min="700" max="0"/> </tone> <tone name="SIT" description="Special Information Tone"> <element freq1="950" freq2="0" min="256" max="400"/> <element freq1="1400" freq2="0" min="256" max="400"/> <element freq1="1800" freq2="0" min="256" max="400"/> </tone> <tone name="RING_TONE" description="North America ring"> <element freq1="440" freq2="480" min="1200" max="0"/> </tone> <tone name="REORDER_TONE" description="North America reorder"> <element freq1="480" freq2="620" min="224" max="316"/> <element freq1="0" freq2="0" min="168" max="352"/> <element freq1="480" freq2="620" min="224" max="316"/> </tone> <tone name="BUSY_TONE" description="North America busy"> <element freq1="480" freq2="620" min="464" max="536"/> <element freq1="0" freq2="0" min="464" max="572"/> <element freq1="480" freq2="620" min="464" max="536"/> </tone> </descriptor>