diff --git a/src/agent_gsm.py b/src/agent_gsm.py
index 46ad42a..be6f01a 100644
--- a/src/agent_gsm.py
+++ b/src/agent_gsm.py
@@ -472,6 +472,12 @@ if __name__ == '__main__':
         bt_ctl = Bluetoothctl()
         bt_ctl.connect(CONFIG.BT_MAC)
         utils.log(f'  Done.')
+    else:
+        utils.log_error(f'No BT MAC specified, cannot connect. Exiting.')
+        raise SystemExit(EXIT_ERROR)
+    
+    # Init BT modem
+    bt_call_controller.init()
 
     # Logging settings
     utils.verbose_logging = CONFIG.Verbose
diff --git a/src/bt_call_controller.py b/src/bt_call_controller.py
index 3b5cddb..7ac22b4 100644
--- a/src/bt_call_controller.py
+++ b/src/bt_call_controller.py
@@ -42,13 +42,18 @@ class CallState(bt_phone.Observer):
 
 
 # Listen to call changes
-CALL_STATE_EVENT = CallState()
-PHONE = bt_phone.Phone()
-PHONE.addObserver(CALL_STATE_EVENT)
+CALL_STATE_EVENT = None
+PHONE = None
 
 # virtualmic module
 PA_MODULE_IDX = -1
 
+def init():
+    global CALL_STATE_EVENT, PHONE
+    CALL_STATE_EVENT = CallState()
+    PHONE = bt_phone.Phone()
+    PHONE.addObserver(CALL_STATE_EVENT)
+
 
 # Set volume 0..100%
 def set_headset_spk_volume(vol: float):
diff --git a/src/bt_phone.py b/src/bt_phone.py
index aae3260..706b611 100644
--- a/src/bt_phone.py
+++ b/src/bt_phone.py
@@ -59,7 +59,7 @@ class Phone(Observable):
                                 model_serial = properties['Serial']
                                 modem_online = properties['Online']
 
-                                utils.log(f'Found modem: {path} name: {modem_name} serial: {model_serial} online: {modem_online}')
+                                # utils.log(f'Found modem: {path} name: {modem_name} serial: {model_serial} online: {modem_online}')
                                 if modem_online == 1:
                                         return path
 
@@ -114,11 +114,11 @@ class Phone(Observable):
                 self.modem = self.wait_for_online_modem(timeout_seconds=10) # 10 seconds timeout
 
                 if self.modem is None:
-                        utils.log_error(f'No BT modem found. Please reconnect the phone.')
+                        utils.log_error(f'  No BT modem found. Please reconnect the phone.')
                         raise RuntimeError('No BT modem found.')
                      
                 # Log about found modem
-                utils.log(f'BT modem found. Modem: {self.modem}')
+                utils.log(f'  BT modem found. Modem: {self.modem}')
 
                 # Get access to ofono API
                 self.org_ofono_obj = self.bus.get_object('org.ofono', self.modem)