diff --git a/ngcp/ngcp.lua b/ngcp/ngcp.lua
index aed70f5..9f06014 100644
--- a/ngcp/ngcp.lua
+++ b/ngcp/ngcp.lua
@@ -326,6 +326,36 @@ NGCP_MT = { __index = NGCP }
         return unique_keys
     end
 
+    function NGCP:log_pref(level, vtype)
+        local _,pref,xavp,xavp_log
+
+        if not level then
+            level = "dbg"
+        end
+
+        if not vtype then
+            for _,pref in pairs(self.prefs) do
+                xavp = pref:xavp("caller")
+                xavp_log = tostring(xavp)
+                sr.log(level, string.format("%s:%s\n", xavp.name, xavp_log))
+                xavp = pref:xavp("callee")
+                xavp_log = tostring(xavp)
+                sr.log(level, string.format("%s:%s\n", xavp.name, xavp_log))
+            end
+        else
+            if self.prefs[vtype] then
+                xavp = self.prefs[vtype]:xavp("caller")
+                xavp_log = tostring(xavp)
+                sr.log(level, string.format("%s:%s\n", xavp.name, xavp_log))
+                xavp = self.prefs[vtype]:xavp("callee")
+                xavp_log = tostring(xavp)
+                sr.log(level, string.format("%s:%s\n", xavp.name, xavp_log))
+            else
+                error(string.format("there is no prefs for %s", vtype))
+            end
+        end
+    end
+
     function NGCP:clean_vars(vtype, group)
         local _, v, var, vars_index, avp
         vars_index = vtype .. "_" .. group .. "_load"
diff --git a/tests/ngcp.lua b/tests/ngcp.lua
index 4dd1321..94f0149 100644
--- a/tests/ngcp.lua
+++ b/tests/ngcp.lua
@@ -75,6 +75,19 @@ TestNGCP = {} --class
         assertEquals(sr.pv.get("$xavp(callee_real_prefs=>dummy)"),"callee")
     end
 
+    function TestNGCP:test_log_pref()
+        self.ngcp:log_pref()
+        assertError(self.ngcp.log_pref, self.ngcp, "dbg", "foo_var")
+    end
+
+    function TestNGCP:test_log_pref_info()
+        self.ngcp:log_pref("info")
+    end
+
+    function TestNGCP:test_log_pref_peer()
+        self.ngcp:log_pref("dbg", "peer")
+    end
+
     function TestNGCP:test_caller_usr_load_empty()
         assertEquals(self.ngcp:caller_usr_load(), {})
     end