I'm using builds 10724 and 10914 to place an outbound call from the FreeSwitch console and use the onInputCallback functionality. My goal is to get mod_vmd working for me. When I run my script and press a touchtone to invoke the callback function, I get some unstable behavior; sometimes it works fine, sometimes I get a core dump (send me an email at wiltingtree@gmail.com if anybody wants the core dump), sometimes it gives me the following error: TypeError: onInputCallback() takes exactly 3 arguments (0 given) In the documentation onInputCallback() takes 3 arguments, and I don't see how it would be very useful with zero. Here is a test script I put together which shows this behavior: import os from freeswitch import * def onInputCallback(session, what, obj): consoleLog("INFO","IM IN THE CALLBACK!\n") return("continue") def fsapi(session, stream, env, args): consoleLog("INFO","Hello there!!!\n") session = Session("{ignore_early_media=true}sofia/gateway/gafachi/1xxxxxxxxxx") session.sleep(500) session.setInputCallback(onInputCallback) session.streamFile("/root/intro.wav") consoleLog("info","Bye!\n") session.hangup() return(session)