*Sep 7 07:34:39.375: %ISDN-6-LAYER2DOWN: Layer 2 for Interface Se0/0/0:15, TEI 0 changed to down*Sep 7 07:34:43.395: %ISDN-6-LAYER2UP: Layer 2 for Interface Se0/0/0:15, TEI 0 changed to upI can see the above messages in my Voice gateway 2901. Its a...