E V E R Y C A L L C O U N T S
9
EXTERNAL IP EXTENSIONS
An external IP extension is an IP phone located outside the office. It is configured as a local
extension of a system, but connects over the Internet or private data network. A user can receive or
place a call with their external IP extension through the phone system to the standard telephone
network or to a VoIP network.
For example, the following illustration shows external IP extension 151 at a home office, and 152 at
a branch office. The external IP extensions connect to the phone system at the main office over the
Internet. In this example, a user can receive or place a call with their external IP extension through
the phone system to the standard telephone network.
Figure 2: External IP extensions
Before proceeding, ensure you have:
•
Connected the system at each location to a network (see page 2).
•
Configured local and public IP addresses (page 3).
•
Configured the router (page 6).
Warning!
Calls to an emergency service number from an external IP extension will not
send the correct address to the emergency operator. We strongly recommend that you
apply a warning label to any external IP extension stating:
If an emergency call is made from this phone, you must provide your address to
the emergency operator.
