Dont clear the display of skinny phones when not needed.

(closes issue #13182)
Reported by: pj
Patches:
      2009011901_dontcleardisplay.diff.txt uploaded by mvanbaak (license 7)
Tested by: mvanbaak, pj


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@170460 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_skinny.c

@@ -2243,6 +2243,9 @@ static void transmit_displaymessage(struct skinny_device *d, const char *text, i
 		//req->data.clearpromptstatus.lineInstance = instance;
 		//req->data.clearpromptstatus.callReference = reference;
 
+		/* send datetime message. We have to do it here because it will clear the display on the phone if we do it elsewhere */
+		handle_time_date_req_message(NULL, d->session);
+
 		if (skinnydebug)
 			ast_verb(1, "Clearing Display\n");
 	} else {
@@ -2542,12 +2545,6 @@ static void mwi_event_cb(const struct ast_event *event, void *userdata)
 	}
 }
 
-static void do_housekeeping(struct skinnysession *s)
-{
-	/* Update time on device */
-	handle_time_date_req_message(NULL, s);
-}
-
 /* I do not believe skinny can deal with video.
    Anyone know differently? */
 /* Yes, it can.  Currently 7985 and Cisco VT Advantage do video. */
@@ -3492,6 +3489,7 @@ static int skinny_hangup(struct ast_channel *ast)
 				transmit_stopmediatransmission(d, sub);
 				transmit_speaker_mode(d, SKINNY_SPEAKEROFF);
 				transmit_ringer_mode(d, SKINNY_RING_OFF);
+				transmit_displaymessage(d, NULL, l->instance, sub->callid); /* clear display */
 				transmit_tone(d, SKINNY_SILENCE, l->instance, sub->callid);
 				/* we should check to see if we can start the ringer if another line is ringing */
 			}
@@ -4155,7 +4153,6 @@ static int handle_keep_alive_message(struct skinny_req *req, struct skinnysessio
 		return -1;
 
 	transmit_response(s->device, req);
-	do_housekeeping(s);
 	return 1;
 }
 
@@ -4846,10 +4843,6 @@ static int handle_onhook_message(struct skinny_req *req, struct skinnysession *s
 				l->name, d->name, sub->callid);
 		}
 	}
-	/* The bit commented below gives a very occasional core dump. */
-	if ((l->hookstate == SKINNY_ONHOOK) && (AST_LIST_NEXT(sub, list) /*&& !AST_LIST_NEXT(sub, list)->rtp*/)) {
-		do_housekeeping(s);
-	}
 	return 1;
 }
 
@@ -5568,7 +5561,6 @@ static int handle_soft_key_event_message(struct skinny_req *req, struct skinnyse
 				}
 			}
 			if ((l->hookstate == SKINNY_ONHOOK) && (AST_LIST_NEXT(sub, list) && !AST_LIST_NEXT(sub, list)->rtp)) {
-				do_housekeeping(s);
 				ast_devstate_changed(AST_DEVICE_NOT_INUSE, "Skinny/%s@%s", l->name, d->name);
 			}
 		}