base-call: treat 'ringing-in' as an in-call state

So that we setup in-call events as soon as we get the incoming call
ringing in. This allows us to have plugin-specific implementations
e.g. reporting call termination when the remote caller hangs up.

src/mm-base-call.c

@@ -673,6 +673,7 @@ mm_base_call_get_path (MMBaseCall *self)
 /* Define the states in which we want to handle in-call events */
 #define MM_CALL_STATE_IS_IN_CALL(state)         \
     (state == MM_CALL_STATE_DIALING ||          \
+     state == MM_CALL_STATE_RINGING_IN  ||      \
      state == MM_CALL_STATE_RINGING_OUT ||      \
      state == MM_CALL_STATE_ACTIVE)
 

src/mm-iface-modem-voice.c

@@ -97,10 +97,9 @@ mm_iface_modem_voice_incoming_call (MMIfaceModemVoice *self)
 
     mm_dbg ("Creating new incoming call...");
     call = create_incoming_call (self, NULL);
-    g_object_set (call,
-                  "state",        MM_CALL_STATE_RINGING_IN,
-                  "state-reason", MM_CALL_STATE_REASON_INCOMING_NEW,
-                  NULL);
+
+    /* Set the state as ringing in */
+    mm_base_call_change_state (call, MM_CALL_STATE_RINGING_IN, MM_CALL_STATE_REASON_INCOMING_NEW);
 
     /* Start its validity timeout */
     mm_base_call_incoming_refresh (call);