No. There are two classes of IP telephone systems: (1) IP

only , and (2) Hybrid IP systems.

o

In IP only systems, all telephones must be connected

by the data network.

o

In Hybrid systems, you can connect telephones either

by the data network, or by a traditional “wire” telephone

circuit. In certain environments, the ability to use

existing traditional circuits can reduce initial costs and

simplify installation.

Also, where multiple locations need to be networked

together, there are differences between how transparent the

systems are to each other. The less transparent, the fewer

features and functions that will work between locations.