5.2.7  

Performing a System Check 
 

Checking the telephones  
 •   The display must be checked on every telephone. The phone number, date and time are normally shown in the display.
 •   If a different text appears ("Gateway not found", for example), this means that there is an error.
Correct the error by following the administration instructions for the relevant telephone.
 •   Perform random terminal tests as described in Section 12.2.11 "Testing Telephones" on all telephones.

Checking for proper system booting  
 •   Set up internal and external calls at random to check if the system is functioning properly.