diff --git a/besetztzeichen.wav b/besetztzeichen.wav
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diff --git a/freizeichen.wav b/freizeichen.wav
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diff --git a/phoneinterface.py b/phoneinterface.py
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+++ b/phoneinterface.py
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+import linphone
+import time
+import threading
+
+DIAL_TONE_FILE = 'freizeichen.wav'
+DIAL_TONE_LEN = 5
+BUSY_TONE_FILE = 'besetztzeichen.wav'
+BUSY_TONE_LEN = 0.96
+RINGBACK_TONE = 'weckzeichen.wav'
+
+class PhoneEvent(object):
+    RegInProgress,\
+    RegSuccessfull,\
+    CallIncoming,\
+    CallRinging,\
+    CallAccepted,\
+    CallEnded,\
+    CallBusy= range(7)
+
+    @classmethod
+    def string(cls, val):
+        for k, v in vars(cls).iteritems():
+            if v == val:
+                return k
+
+class PhoneInterface(object):
+    def __init__(self, config, roconfig):
+        cbs = {
+            'global_state_changed': self.__global_state_changed,
+            'registration_state_changed': self.__registration_state_changed,
+            'call_state_changed': self.__call_state_changed
+        }
+
+        self.__event_cbs = []
+
+        self.__core = linphone.Core.new(cbs, config, roconfig)
+
+        # Set default parameters overriding the ones from the given config file
+        self.__core.set_user_agent('FeTAp 615', '0.1')
+        self.__core.ringback = RINGBACK_TONE
+        self.__core.max_calls = 1
+        self.__core.set_call_error_tone(linphone.Reason.Busy, '')
+        self.__core.disable_chat(linphone.Reason.None)
+        self.__core.echo_cancellation_enabled = False
+        self.__core.video_capture_enabled = False
+        self.__core.video_display_enabled = False
+
+    def __global_state_changed(self, core, state, msg):
+        print 'Global state changed:', state, msg
+        # TODO: Do we need events emitted here?
+        pass
+
+    def __registration_state_changed(self, core, proxyconf, state, msg):
+        print 'Registration state changed:', proxyconf, state, msg
+        evt = None
+        if state == linphone.RegistrationState.Progress:
+            evt = PhoneEvent.RegInProgress
+        elif state == linphone.RegistrationState.Ok:
+            evt = PhoneEvent.RegSuccessfull
+
+        if evt is not None:
+            for cb in self.__event_cbs:
+                cb(evt)
+        else:
+            print 'Unhandled registration state:', linphone.RegistrationState.string(state)
+
+    def __call_state_changed(self, core, call, state, msg):
+        print 'Call state changed:', call, state, msg
+        evt = None
+        if state == linphone.CallState.IncomingReceived:
+            evt = PhoneEvent.CallIncoming
+        elif state == linphone.CallState.OutgoingRinging:
+            evt = PhoneEvent.CallRinging
+        elif state == linphone.CallState.Connected:
+            evt = PhoneEvent.CallAccepted
+        elif state == linphone.CallState.End:
+            evt = PhoneEvent.CallEnded
+        elif state == linphone.CallState.Error:
+            if call.error_info.reason == linphone.Reason.Busy:
+                evt = PhoneEvent.CallBusy
+
+        if evt is not None:
+            for cb in self.__event_cbs:
+                cb(evt)
+        else:
+            print 'Unhandled call state:', linphone.CallState.string(state)
+        
+    def __pollthread(self):
+        while self.__running:
+            self.__core.iterate()
+            time.sleep(0.02) # Value from example code
+
+    def start(self):
+        self.__running = True
+        t = threading.Thread(target=self.__pollthread)
+        t.start()
+
+    def stop(self):
+        self.__running = False
+
+    def add_event_cb(self, cb):
+        self.__event_cbs.append(cb)
+
+    def call(self, number):
+        self.__core.invite(number)
+
+    def accept_call(self):
+        self.__core.accept_call(self.__core.current_call)
+
+    def end_call(self):
+        self.__core.terminate_call(self.__core.current_call)
+
+    def __play_loop_thread(self, filename, length, continous):
+        self.__core.play_local(filename)
+        # Start replay of file 500ms before the old playing will end
+        # to get more or less continous play
+        i = 50 if continous else 0
+        while self.__playing and self.__running:
+            # TODO: Schoener?
+            if i == length * 100:
+                self.__core.play_local(filename)
+                i = 0
+            time.sleep(0.01)
+            i += 1
+        self.__core.stop_ringing()
+
+    def __play_file(self, filename, length, continous=False):
+        self.__playing = True
+        t = threading.Thread(target=self.__play_loop_thread, args=(filename, length, continous))
+        t.start()
+
+    def play_dial_tone(self):
+        self.__play_file(DIAL_TONE_FILE, DIAL_TONE_LEN, True)
+
+    def play_busy_tone(self):
+        self.__play_file(BUSY_TONE_FILE, BUSY_TONE_LEN)
+
+    def stop_playing(self):
+        self.__playing = False
+
+if __name__ == '__main__':
+    def event_cb(evt):
+        print 'Got event:', PhoneEvent.string(evt)
+
+    try:
+        phone = PhoneInterface('.linphonerc-foo', '.linphonerc')
+        phone.add_event_cb(event_cb)
+        phone.start()
+        i = 0
+        while True:
+            time.sleep(1)
+            i += 1
+            if i == 5:
+                phone.call('3474')
+                #phone.play_busy_tone()
+                pass
+    except KeyboardInterrupt:
+        phone.stop()
+        
diff --git a/weckzeichen.wav b/weckzeichen.wav
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