app_wrappers: Indicate progress before playing any tones on failure.

If the line rings, we don't need to do anything special, but we indicate
progress explicitly on the other path, since some devices may need this
if no "Progress" was encountered prior to this application.

Author: InterLinked1

apps/app_wrappers.c

@@ -104,7 +104,9 @@ static int dial_exec(struct ast_channel *chan, const char *data)
 	}
 
 	if (ts) {
-		int res = ast_playtones_start(chan, 0, ts->data, 0);
+		int res;
+		ast_indicate(chan, AST_CONTROL_PROGRESS); /* In case no progress has been sent yet, send it now so audio passes reliably */
+		res = ast_playtones_start(chan, 0, ts->data, 0);
 		ts = ast_tone_zone_sound_unref(ts);
 		if (res) {
 			ast_log(LOG_WARNING, "Unable to start tones on channel %s\n", ast_channel_name(chan));