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7. Using the CG-410
Basically, your CG-410 is a relaying station or a ‘FXO Gateway’ between the remote PSTN phone and
the VoIP endpoint device.
Users at a remote site can access the CG-410 by PSTN (or VoIP) and make a phone call to another
VoIP (or PSTN) phone. For example, an IP phone user in Korea can call the CG-410 user in U.S.
through the Internet and connect it to a local PSTN call in US.
As shown in the figure above, there are two types of incoming calls which can be relayed: 1) relaying
VoIP calls to PSTN and 2) relaying PSTN calls to VoIP calls.
Chapter 7