@@ -76,6 +76,7 @@ struct cfg_group_tm	default_tm_cfg = {

 	500,	/* default_code */

 	1,	/* reparse_invite */

+	0,	/* tm_dns_failover_branch_failure -- if 1 in case 503 will be executed branch_failure route*/

 	0,	/* tm_blst_503 -- if 1 blocklist 503 sources, using tm_blst_503_min,

 		 * tm_blst_503_max, tm_blst_503_default and the Retry-After header

 		 * in the 503 reply */

@@ -167,6 +168,8 @@ cfg_def_t	tm_cfg_def[] = {

 		"if set to 1, the CANCEL and negative ACK requests are "

 		"constructed from the INVITE message which was sent out "

 		"instead of building them from the received request"},

+	{"dns_failover_branch_failure",		CFG_VAR_INT | CFG_ATOMIC,	0, 1, 0, 0,

+		"if set to 1, branch_failure route will be executed in case 503 reply"},

 	{"blst_503",		CFG_VAR_INT | CFG_ATOMIC,	0, 1, 0, 0,

 		"if set to 1, blocklist 503 SIP response sources"},

 	{"blst_503_def_timeout",	CFG_VAR_INT | CFG_ATOMIC,	0, 0, 0, 0,

@@ -117,6 +117,7 @@ struct cfg_group_tm {

 	int	unmatched_cancel;

 	int	default_code;

 	int	reparse_invite;

+	int	tm_dns_failover_branch_failure;

 	int	tm_blst_503;

 	int	tm_blst_503_default;

 	int	tm_blst_503_min;

@@ -2495,30 +2495,30 @@ int reply_received( struct sip_msg  *p_msg )

 	p_msg->fwd_send_flags.blst_imask|=

 		uac->request.dst.send_flags.blst_imask & BLST_503;

 #ifdef USE_DNS_FAILOVER

-		/* if this is a 503 reply, and the destination resolves to more ips,

-		 *  add another branch/uac.

-		 *  This code is out of LOCK_REPLIES() to minimize the time the

-		 *  reply lock is held (the lock won't be held while sending the

-		 *   message)*/

-

-

-		failover_continue = (failover_reply_codes_str.s!=NULL && failover_reply_codes_str.len>0 &&

-							t_failover_check_reply_code(msg_status));

-

-		if (cfg_get(core, core_cfg, use_dns_failover) && (msg_status==503 || failover_continue)) {

-			branch_ret=add_uac_dns_fallback(t, t->uas.request,

-												uac, !replies_locked);

-			prev_branch=-1;

-			while((branch_ret>=0) &&(branch_ret!=prev_branch)){

-				prev_branch=branch_ret;

-				branch_ret=t_send_branch(t, branch_ret, t->uas.request , 0, 1);

-			}

+	/* if this is a 503 reply, and the destination resolves to more ips,

+	 *  add another branch/uac.

+	 *  This code is out of LOCK_REPLIES() to minimize the time the

+	 *  reply lock is held (the lock won't be held while sending the

+	 *   message)*/

+

+

+	failover_continue = (failover_reply_codes_str.s!=NULL && failover_reply_codes_str.len>0 &&

+						t_failover_check_reply_code(msg_status));

+

+	if (cfg_get(core, core_cfg, use_dns_failover) && (msg_status==503 || failover_continue)) {

+		branch_ret=add_uac_dns_fallback(t, t->uas.request,

+											uac, !replies_locked);

+		prev_branch=-1;

+		while((branch_ret>=0) &&(branch_ret!=prev_branch)){

+			prev_branch=branch_ret;

+			branch_ret=t_send_branch(t, branch_ret, t->uas.request , 0, 1);

 		}

+	}

 #endif

 	/* processing of on_reply block */

 	if ((onreply_route || sr_event_enabled(SREV_SIP_REPLY_OUT))

 #ifdef USE_DNS_FAILOVER

-		&& (branch_ret<0)

+		&& (cfg_get(tm, tm_cfg, tm_dns_failover_branch_failure) ? (branch_ret<0) : 1 )

 #endif

 	) {

 		set_route_type(TM_ONREPLY_ROUTE);

@@ -467,6 +467,8 @@ static param_export_t params[]={

 	{"default_reason",      PARAM_STRING, &default_tm_cfg.default_reason     },

 	{"reparse_invite",      PARAM_INT, &default_tm_cfg.reparse_invite        },

 	{"ac_extra_hdrs",       PARAM_STR, &default_tm_cfg.ac_extra_hdrs         },

+	{"dns_failover_branch_failure", PARAM_INT,

+		&default_tm_cfg.tm_dns_failover_branch_failure},

 	{"blst_503",            PARAM_INT, &default_tm_cfg.tm_blst_503           },

 	{"blst_503_def_timeout",PARAM_INT, &default_tm_cfg.tm_blst_503_default   },

 	{"blst_503_min_timeout",PARAM_INT, &default_tm_cfg.tm_blst_503_min       },