Things to Try!

1. Check for a dial tone by picking up your telephone. If you have no dial tone, follow this article here
    
2. Does this issue only happen when you call a specific number? Test this by calling the same number using another telephone, or a different number entirely
    
3. Make sure your telephone volume is not off, low or muted
    
4. If you're using a cordless telephone, check that the batteries are charged. Also check your telephone's connection to it's base station. Ensure the base station is connected correctly to the telephone line
    
5. Check Call Barring is not enabled by dialling * # 34 # 
    
6. If you have Carrier Pre-Select enabled, dial 1280, followed by a test number, to force the call to travel through Zen 
    
7. If you haven't already, test your telephone from the Master Test Socket. You can find a video on how to do this here.
   
   
8. If the above steps do not resolve the problem, please contact our Technical Support team for further assistance.