Only truly consider the channel in the same format if the format matches the raw format OR if a translation path already exists to translate between them. (issue #7887 reported by softins & issue #7803 reported by alvaro_palma_aste). Thanks goes to stubert for giving me access to a box and showing me a scenario where this occured.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@42600 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channel.c

@@ -2385,7 +2385,7 @@ static int set_format(struct ast_channel *chan, int fmt, int *rawformat, int *fo
 	/* Now we have a good choice for both. */
 	ast_mutex_lock(&chan->lock);
 
-	if ((*rawformat == native) && (*format == fmt)) {
+	if ((*rawformat == native) && (*format == fmt) && ((*rawformat == *format) || (*trans))) {
 		/* the channel is already in these formats, so nothing to do */
 		ast_mutex_unlock(&chan->lock);
 		return 0;