I have a inter-tel phone system @ my pizzeria in elizabeth new jersey, It was purchased with the place. I need someone to explain the system and set it up for my place. Do you know anyone in this area? The system is working now not to the full advantage!

Do you know what type fo system it is?
If not a part number off the bottom of a phone might point us in the right direction.
or you can try the <a href="https://www.sundance-communications.com/installers/Telephone_Installers/United_States/New_Jersey/">installers</a> page to find someone local.

The Part Number 520.4300

That sounds like an Axxess system.
I'd try looking here for someone local<a href="https://www.sundance-communications.com/installers/Telephone_Installers/United_States/New_Jersey/">https://www.sundance-communications.com/installers/Telephone_Installers/Unite d_States/New_Jersey/</a>
If you have a general question, post it here and we'll try to give you a hand.

Did you ever find someone to service your system? Let me know...