sip option flags handled incorrectly

(closes issue #15376)
Reported by: Takehiko Ooshima
Tested by: dvossel, Takehiko_Ooshima


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@207029 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -20062,7 +20062,7 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, int
 	required = get_header(req, "Require");
 	if (!ast_strlen_zero(required)) {
 		required_profile = parse_sip_options(NULL, required);
-		if (required_profile && required_profile != SIP_OPT_REPLACES && required_profile != SIP_OPT_TIMER) {
+		if (required_profile && !(required_profile & (SIP_OPT_REPLACES | SIP_OPT_TIMER))) {
 			/* At this point we only support REPLACES and Session-Timer */
 			transmit_response_with_unsupported(p, "420 Bad extension (unsupported)", req, required);
 			ast_log(LOG_WARNING, "Received SIP INVITE with unsupported required extension: %s\n", required);