DTMF attended transfers sometimes fail for no apparent reason.

The loop in feature_request_and_dial() can exit when Party C has answered
without processing an AST_CONTROL_ANSWER.  Also sometimes an
AST_CONTROL_ANSWER never happens even though Party C has answered.

Don't hangup Party C if he is up or we receive an AST_CONTROL_ANSWER.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@304005 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_features.c

@@ -1956,9 +1956,8 @@ static struct ast_channel *feature_request_and_dial(struct ast_channel *caller,
 
 done:
 	ast_indicate(caller, -1);
-	if (chan && ready) {
-		if (chan->_state == AST_STATE_UP)
-			state = AST_CONTROL_ANSWER;
+	if (chan && (ready || chan->_state == AST_STATE_UP)) {
+		state = AST_CONTROL_ANSWER;
 	} else if (chan) {
 		ast_hangup(chan);
 		chan = NULL;