|If your business has a bigger infrastructure then you need a more advanced telephone system. Well, you can get 64 extensions with the TDA 100 PABX system. The features of this phone are truly commendable. You can get 96 ports and five universal slots with this system. Even if your staff is not technically sound, you would not be having a lot of issues because this phone is easy to use. The USB plug-in facilitates the easy plug-in functionality. You would not find it a problem to upgrade the system as well.