diff --git a/call_manager.py b/call_manager.py
index 0dcc335..4134083 100644
--- a/call_manager.py
+++ b/call_manager.py
@@ -36,7 +36,7 @@ class CallManager:
             response = s.recv(1024)
             print("Call notice sent", "response=", response.decode())
             s.close()
-            undeaf_mumble()
+            self.undeaf_mumble()
             self.state = OUTGOING_CALL
             self.station = station
             station["red"].on()
@@ -45,7 +45,7 @@ class CallManager:
             station["green"].off()
 
     def incoming_call(self, station):
-        undeaf_mumble()
+        self.undeaf_mumble()
         self.state = INCOMING_CALL
         self.station = station
         station["red"].on()
@@ -54,7 +54,7 @@ class CallManager:
         print("Hang! self.station", self.station)
         if self.station is not None:
             self.station["red"].off()
-        deaf_mumble()
+        self.deaf_mumble()
         self.state = NO_CALL
         self.station = None