diff --git a/src/mod/endpoints/mod_sofia/mod_sofia.h b/src/mod/endpoints/mod_sofia/mod_sofia.h
index 9dd4d2d748..8c50a9059d 100644
--- a/src/mod/endpoints/mod_sofia/mod_sofia.h
+++ b/src/mod/endpoints/mod_sofia/mod_sofia.h
@@ -215,6 +215,7 @@ typedef enum {
 	PFLAG_MANAGE_SHARED_APPEARANCE,
 	PFLAG_MANAGE_SHARED_APPEARANCE_SYLANTRO,
 	PFLAG_DISABLE_SRV,
+	PFLAG_DISABLE_SRV503,
 	PFLAG_DISABLE_NAPTR,
 	PFLAG_AUTOFLUSH,
 	PFLAG_NAT_OPTIONS_PING,
diff --git a/src/mod/endpoints/mod_sofia/sofia.c b/src/mod/endpoints/mod_sofia/sofia.c
index 2475a5cc0b..96df565ee3 100644
--- a/src/mod/endpoints/mod_sofia/sofia.c
+++ b/src/mod/endpoints/mod_sofia/sofia.c
@@ -1790,6 +1790,8 @@ void *SWITCH_THREAD_FUNC sofia_profile_thread_run(switch_thread_t *thread, void
 									 NTATAG_USE_SRV(0)),
 							  TAG_IF(sofia_test_pflag(profile, PFLAG_DISABLE_NAPTR),
 									 NTATAG_USE_NAPTR(0)),
+							  TAG_IF(sofia_test_pflag(profile, PFLAG_DISABLE_SRV503),
+									 NTATAG_SRV_503(0)),									 
 							  NTATAG_DEFAULT_PROXY(profile->outbound_proxy),
 							  NTATAG_SERVER_RPORT(profile->server_rport_level),
 							  NTATAG_CLIENT_RPORT(profile->client_rport_level),
@@ -3962,6 +3964,10 @@ switch_status_t config_sofia(int reload, char *profile_name)
 						if (switch_true(val)) {
 							sofia_set_pflag(profile, PFLAG_DISABLE_NAPTR);
 						}
+					} else if (!strcasecmp(var, "disable-srv503")) {
+						if (switch_true(val)) {
+							sofia_set_pflag(profile, PFLAG_DISABLE_SRV503);
+						}						
 					} else if (!strcasecmp(var, "unregister-on-options-fail")) {
 						if (switch_true(val)) {
 							sofia_set_pflag(profile, PFLAG_UNREG_OPTIONS_FAIL);