There are many problems that can and do occur with phone systems. To assist in identifying the type of problem there are a number of tests that can be carried out by the phone user before contacting the Telephone Help Desk. Phone is dead.
Phone sounds noisy or crackles.
You cannot hear the caller or they cannot hear you. For all the problems above you should first replace your phone with another Touchfone 200 or 300 series phone, or equivalent, if you have one available nearby. If the problem still exists with the replacement handset then the problem may be reported as a LINE fault and confirming to the PABX Help desk that you have conducted the test. Voicemail works but your message light does not come on. The process is as above but you should use a replacement Touchfone with a message wait light for the test if you have one available.