diff --git a/modules/mid_registrar/mid_registrar.c b/modules/mid_registrar/mid_registrar.c
index 42099fa8fda..11ded09ec9f 100644
--- a/modules/mid_registrar/mid_registrar.c
+++ b/modules/mid_registrar/mid_registrar.c
@@ -58,6 +58,9 @@ struct usrloc_api ul;
 struct tm_binds tmb;
 struct sig_binds sig_api;
 
+/* the list of domains (tables) used at opensips.cfg level by mid-registrar */
+static str_list *mid_reg_domains;
+
 /* specifically used to mutually exclude concurrent calls of the
  * TMCB_RESPONSE_IN callback, upon SIP 200 OK retransmissions */
 rw_lock_t *tm_retrans_lk;
@@ -211,25 +214,47 @@ struct module_exports exports= {
 	cfg_validate /* reload confirm function */
 };
 
+int is_mid_reg_domain(const str *dom)
+{
+	str_list *it;
+
+	for (it = mid_reg_domains; it; it = it->next)
+		if (str_match(&it->s, dom))
+			return 1;
+
+	return 0;
+}
+
 /*! \brief
  * Convert char* parameter to udomain_t* pointer
  */
 static int domain_fixup(void** param)
 {
 	udomain_t* d;
-	str dom_s;
+	str *dom_s = (str *)*param; /* CMD_PARAM_STATIC is always NT */
+	str_list *dom;
+
+	if (!is_mid_reg_domain(dom_s)) {
+		dom = pkg_malloc(sizeof *dom);
+		if (!dom) {
+			LM_ERR("oom\n");
+			return E_OUT_OF_MEM;
+		}
+		memset(dom, 0, sizeof *dom);
+
+		if (pkg_nt_str_dup(&dom->s, dom_s) < 0) {
+			pkg_free(dom);
+			return E_OUT_OF_MEM;
+		}
 
-	if (pkg_nt_str_dup(&dom_s, (str*)*param) < 0)
-		return E_OUT_OF_MEM;
+		add_last(dom, mid_reg_domains);
+	}
 
-	if (ul.register_udomain(dom_s.s, &d) < 0) {
+	if (ul.register_udomain(dom_s->s, &d) < 0) {
 		LM_ERR("failed to register domain\n");
-		pkg_free(dom_s.s);
 		return E_UNSPEC;
 	}
 
-	pkg_free(dom_s.s);
-
 	*param = (void*)d;
 	return 0;
 }
diff --git a/modules/mid_registrar/mid_registrar.h b/modules/mid_registrar/mid_registrar.h
index 008ab50d482..48aaf590292 100644
--- a/modules/mid_registrar/mid_registrar.h
+++ b/modules/mid_registrar/mid_registrar.h
@@ -115,6 +115,9 @@ struct mid_reg_info {
 	rw_lock_t *tm_lock;
 };
 
+/* check if a given domain belongs to mid-registrar or not */
+int is_mid_reg_domain(const str *dom);
+
 extern rw_lock_t *tm_retrans_lk;
 
 extern int case_sensitive;
diff --git a/modules/mid_registrar/ulcb.c b/modules/mid_registrar/ulcb.c
index 0ec5e3f6fa0..91731c54f84 100644
--- a/modules/mid_registrar/ulcb.c
+++ b/modules/mid_registrar/ulcb.c
@@ -227,6 +227,12 @@ void mid_reg_ct_event(void *binding, ul_cb_type type)
 	ucontact_t *c = (ucontact_t *)binding;
 	int_str_t *skip_dereg;
 
+	if (!is_mid_reg_domain(c->domain)) {
+		LM_DBG("skipping domain '%.*s', contact: '%.*s', cb: %d\n",
+		       c->domain->len, c->domain->s, c->c.len, c->c.s, type);
+		return;
+	}
+
 	LM_DBG("Contact callback (%d): contact='%.*s'\n", type, c->c.len, c->c.s);
 
 	if (type & (UL_CONTACT_DELETE|UL_CONTACT_EXPIRE)
@@ -245,6 +251,12 @@ void mid_reg_aor_event(void *binding, ul_cb_type type)
 	urecord_t *r = (urecord_t *)binding;
 	int_str_t *skip_dereg;
 
+	if (!is_mid_reg_domain(r->domain)) {
+		LM_DBG("skipping domain '%.*s', aor: '%.*s', cb: %d\n",
+		       r->domain->len, r->domain->s, r->aor.len, r->aor.s, type);
+		return;
+	}
+
 	LM_DBG("AOR callback (%d): contact='%.*s'\n", type,
 	       r->aor.len, r->aor.s);