Thanks for checking it Michael. I thought i was trying execute 'speak' when AVMD detects a beep as below, but may be i am missing something. Please review the code and let me know if i am missing anything:

from freeswitch import *

# WARNING: known bugs with hangup hooks, use with extreme caution

def hangup_hook(session, what):

  %s!!\n\n" % what)

    return

def input_callback(session, what, obj):

    if (what == "dtmf"):

        consoleLog("info", what + " from callback " + obj.digit + "\n")

        return

    elif (what == "event" and session.getVariable('avmd_detect') == "TRUE"):

        consoleLog("info", "Voicemail Detected\n")

    return "TRUE"

def handler(session, args):

    session.answer()

   # session.setVariable("hangup_after_bridge", "false")

    callback = session.setInputCallback("input_callback")

    session.execute("avmd", "start")

    consoleLog("info", "AVMD start\n")

    session.execute("sleep", "18000")

    consoleLog("info", "AVMD status %s\n" % session.getVariable('avmd_detect'))

    if session.getVariable('avmd_detect'):

         consoleLog("info", "Beep Detected\n")

         session.execute("speak", "flite|kal|'Hi this is '")

         session.execute("avmd", "stop")

    session.execute("speak", "flite|kal|'Hi this is '")

    consoleLog("info","callback returned   %s!!\n\n" % callback)

    session.execute("avmd", "stop")

    consoleLog("info", "AVMD stop\n")

    session.setHangupHook(hangup_hook)

    session.hangup() #hangup the call

Appreciate it!

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