User guide

VOIP INFORMATION 239
TALKSWITCH VOIP NETWORK
A TalkSwitch VoIP network has at least one SIP device at each location. A SIP device is a VoIP-
enabled TalkSwitch unit, IP telephone or SIP gateway. One TalkSwitch unit in the network acts
as the SIP server. The other SIP devices are SIP clients.
A user, auto attendant or call cascade can dial a three-digit VoIP number (ranging from 250 to
299) to reach an extension, auto attendant or voice mailbox at any location.
For example, the following illustration shows a TalkSwitch VoIP network with two locations. Calls
between the offices are routed over the Internet, and local calls are routed over the traditional
telephone network.
Figure 19: TalkSwitch VoIP network
Five VoIP numbers are assigned to San Francisco (251 to 255), and nine are assigned to New York
(261 to 269). These VoIP numbers can be dialed directly from any extension, auto attendant or
call cascade in the network.
The TalkSwitch unit in the San Francisco office has a static public IP address, so is designated as
the SIP server. The TalkSwitch unit in New York is a SIP client.
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).