diff --git a/sessions/sessions.go b/sessions/sessions.go
index 7f5f606b9..b29e5ba12 100644
--- a/sessions/sessions.go
+++ b/sessions/sessions.go
@@ -706,6 +706,10 @@ func (smg *SMGeneric) GetMaxUsage(gev SMGenericEvent) (maxUsage time.Duration, e
 		return
 	}
 	maxUsage = time.Duration(maxDur)
+	if maxUsage != time.Duration(-1*time.Second) &&
+		maxUsage < smg.cgrCfg.SessionSCfg().MinCallDuration {
+		return 0, errors.New("UNAUTHORIZED_MIN_DURATION")
+	}
 	return
 }