core: Don't stop generators when writing RTCP frames.

Generators provide such functionality as tone generation or
silence generation. RTCP frames provide RTCP information and
should not stop generators from operating.

ASTERISK-28005

Change-Id: Ieadada07b068a7aa426e8763f1b73a18e1ac34a9

main/channel.c

@@ -5029,7 +5029,7 @@ int ast_write_stream(struct ast_channel *chan, int stream_num, struct ast_frame
 		goto done;
 	}
 
-	if (ast_channel_generatordata(chan) && (!fr->src || strcasecmp(fr->src, "ast_prod"))) {
+	if (ast_channel_generatordata(chan) && (fr->frametype != AST_FRAME_RTCP) && (!fr->src || strcasecmp(fr->src, "ast_prod"))) {
 		if (ast_test_flag(ast_channel_flags(chan), AST_FLAG_WRITE_INT)) {
 				ast_deactivate_generator(chan);
 		} else {