diff --git a/ngcp/ngcp.lua b/ngcp/ngcp.lua
index ab00266..3a2d5fd 100644
--- a/ngcp/ngcp.lua
+++ b/ngcp/ngcp.lua
@@ -160,6 +160,7 @@ end
                     {"caller_ring_group_policy", "ring_group_policy"}
                 },
                 caller_real_prefs = {
+                    {"caller_no_nat_sipping", "no_nat_sipping"},
                     {"caller_reject_emergency", "reject_emergency"},
                     {"caller_ncos_id", "ncos_id"},
                     {"caller_inbound_upn", "inbound_upn"},
diff --git a/tests/ngcp.lua b/tests/ngcp.lua
index 28bbe08..ee4d7c0 100644
--- a/tests/ngcp.lua
+++ b/tests/ngcp.lua
@@ -92,6 +92,35 @@ TestNGCP = {} --class
         assertEquals(self.ngcp:caller_usr_load(), {})
     end
 
+    function TestNGCP:test_caller_usr_load_empty_dom()
+        local c = self.ngcp.config
+        env:connect(c.db_database, c.db_username, c.db_pass, c.db_host, c.db_port) ;mc :returns(self.con)
+        self.con:execute("SELECT * FROM usr_preferences WHERE uuid ='ae736f72-21d1-4ea6-a3ea-4d7f56b3887c'")  ;mc :returns(self.cur)
+        self.cur:fetch(mc.ANYARGS)    ;mc :returns(self.up_vars:val("ae736f72_21d1_4ea6_a3ea_4d7f56b3887c"))
+        self.cur:fetch(mc.ANYARGS)    ;mc :returns(self.up_vars:val("ae736f72_21d1_4ea6_a3ea_4d7f56b3887c"))
+        self.cur:fetch(mc.ANYARGS)    ;mc :returns(self.up_vars:val("ae736f72_21d1_4ea6_a3ea_4d7f56b3887c"))
+        self.cur:fetch(mc.ANYARGS)    ;mc :returns(self.up_vars:val("ae736f72_21d1_4ea6_a3ea_4d7f56b3887c"))
+        self.cur:fetch(mc.ANYARGS)    ;mc :returns(self.up_vars:val("ae736f72_21d1_4ea6_a3ea_4d7f56b3887c"))
+        self.cur:fetch(mc.ANYARGS)    ;mc :returns(nil)
+        self.cur:close()
+        self.con:close()
+
+        mc:replay()
+        local keys = self.ngcp:caller_usr_load("ae736f72-21d1-4ea6-a3ea-4d7f56b3887c")
+        mc:verify()
+
+        assertEquals(sr.pv.get("$xavp(caller_usr_prefs=>dummy)"), "caller")
+        assertEquals(sr.pv.get("$xavp(caller_real_prefs=>account_id)"), 2)
+        assertEquals(sr.pv.get("$avp(s:caller_account_id)"), 2)
+        assertEquals(sr.pv.get("$xavp(caller_real_prefs=>cli)"), "4311001")
+        assertEquals(sr.pv.get("$xavp(caller_real_prefs=>cc)"), "43")
+        assertEquals(sr.pv.get("$avp(s:caller_cc)"), "43")
+        assertEquals(sr.pv.get("$xavp(caller_real_prefs=>ac)"), "1")
+        assertEquals(sr.pv.get("$avp(s:caller_ac)"), "1")
+        assertEquals(sr.pv.get("$xavp(caller_real_prefs=>no_nat_sipping)"), "no")
+        assertEquals(sr.pv.get("$avp(s:caller_no_nat_sipping)"), "no")
+    end
+
     function TestNGCP:test_caller_usr_load()
         local c = self.ngcp.config
         env:connect(c.db_database, c.db_username, c.db_pass, c.db_host, c.db_port) ;mc :returns(self.con)
diff --git a/tests_v/up_vars.lua b/tests_v/up_vars.lua
index 9e32bc6..b60d5e9 100644
--- a/tests_v/up_vars.lua
+++ b/tests_v/up_vars.lua
@@ -39,6 +39,16 @@ up_vars = {
           type = 0,
           value = "1",
           last_modified = "1900-01-01 00:00:01"
+        },
+        {
+          id = 10,
+          uuid = "ae736f72-21d1-4ea6-a3ea-4d7f56b3887c",
+          username = "testuser1",
+          domain = "192.168.51.56",
+          attribute = "no_nat_sipping",
+          type = 0,
+          value = "no",
+          last_modified = "1900-01-01 00:00:01"
         }
     },
     _94023caf_dfba_4f33_8bdb_b613ce627613 = {