diff --git a/hblink.py b/hblink.py
index 2610323..b12b529 100755
--- a/hblink.py
+++ b/hblink.py
@@ -205,12 +205,22 @@ class OPENBRIDGE(DatagramProtocol):
                 if _slot != 1:
                     logger.error('(%s) OpenBridge packet discarded because it was not received on slot 1. SID: %s, TGID %s', self._system, int_id(_rf_src), int_id(_dst_id))
                     return
-
+                
+                #Low-level TG filtering 
+                if _call_type != 'unit':
+                    _int_dst_id = int_id(_dst_id)
+                    if _int_dst_id <= 79 or (_int_dst_id >= 9990 and _int_dst_id <= 9999) or _int_dst_id == 900999:
+                        if _stream_id not in self._laststrid:
+                            logger.info('(%s) CALL DROPPED WITH STREAM ID %s FROM SUBSCRIBER %s BY GLOBAL TG FILTER', self._system, int_id(_stream_id), _int_dst_id)
+                            self.send_bcsq(_dst_id,_stream_id)
+                            self._laststrid.append(_stream_id)
+                        return
+                
                 # ACL Processing
                 if self._CONFIG['GLOBAL']['USE_ACL']:
                     if not acl_check(_rf_src, self._CONFIG['GLOBAL']['SUB_ACL']):
                         if _stream_id not in self._laststrid:
-                            logger.info('(%s) CALL DROPPED WITH STREAM ID %s FROM SUBSCRIBER %s BY GLOBAL ACL', self._system, int_id(_stream_id), int_id(_rf_src))
+                            logger.info('(%s) CALL DROPPED WITH STREAM ID %s ON TGID %s BY GLOBAL TS1 ACL', self._system, int_id(_stream_id), int_id(_rf_src))
                             self.send_bcsq(_dst_id,_stream_id)
                             self._laststrid.append(_stream_id)
                         return