LevelOne VOI-7100 - Manual (Page 38)

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You need to have a DDNS account before configuring the DDNS setting.
Usually, most of the VoIP applications are working with a SIP Proxy Server.
Nonetheless, you may have a DDNS account with a public IP address, and
others can call you via the DDNS account.
Example
In this example, the other user can place VoIP calls to your IP Phone directly by
your domain address.