User guide

VOIP INFORMATION 238
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 TalkSwitch unit 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 TalkSwitch unit to the standard telephone network.
Figure 18: External IP extensions
Before proceeding, ensure you have:
• Connected the TalkSwitch system at each location to a network (page 231).
• Configured local and public IP addresses (page 232).
• Configured the router (page 235).
To set up an external IP extension, use the following steps:
1. Add the external IP extension, as described in Adding IP phones on page 81. Procedures are
available for adding TalkSwitch, Polycom, Grandstream, Counterpath and selected other
phones (depending on the market).
2. Verify operation of the external IP extension:
a) Select the Local Extension/Fax page.
b) Select the external IP extension.
c) Confirm Registered is Yes, and the Phone’s IP address appears in the IP Extension
Details area.
3. Optionally, perform advanced VoIP configuration:
a) All VoIP lines are shared by default. You can reserve VoIP lines for the external IP
extensions. See Reserving VoIP lines on page 249.
b) External IP extensions will use the preferred codec selected for the TalkSwitch profile.
The default preferred codec is G.729. You can select the Preferred codec for the
TalkSwitch profile. See Setting codec options on page 246.