You hear a dial tone but can not dial out.
Check the pause (P) tone (T) switch on top of telephone. It should be in the (T) position. 
Mon, 15 Sep, 2014 at 10:22 PM
Handset rattles.
Submit a ticket. A technician will replace the handset. 
Fri, 15 Aug, 2014 at 8:35 AM
No dial tone is heard.
Check to insure hook switch pops out when handset is lifted. If it sticks frequently, submit a ticket and a technician will adjust the clearance of the hook...
Fri, 15 Aug, 2014 at 8:40 AM