LevelOne VOI-7011 - Manual (Page 50)

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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.