Talkswitch 24-CA - Manual (Page 172)

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Figure 125: Multi-location network with VoIP calling
5.3.2 Select which TalkSwitch to use as the SIP network server
A multi-location SIP network requires a SIP server to manage calls across the
network. The SIP server contains registration information for all SIP devices
in the network. When making or receiving a VoIP call, a device will register
with the SIP server, which will then route the call to the appropriate
destination.
TalkSwitch units have a built-in SIP server to manage a VoIP network.
Though every networked TalkSwitch unit has the capability, you must
designate only one TalkSwitch unit in a network as the SIP server.
5.3.2.1 Which location and unit should be the SIP server?
Any TalkSwitch unit on the network can be designed to be the SIP server.
To simplify network operation and reliability, we recommend that you
choose a location that has a static, rather than a dynamic public IP address.
A static public IP address does not change, providing a consistent
connection address for each location to communicate with the SIP server.
For VoIP calls made through a VoIP service provider, the service provider
will act as the SIP Server.
Telephone
Network
Internet
New York office
TalkSwitch 48-CVA
Miami home
Mediatrix 2102
San Francisco
office
TalkSwitch 48-CVA