Draytek Vigor2110 Series User Manual page 195

Profile Name
Register via
Assign a name for this profile for identifying. You can type
similar name with the domain. For example, if the domain name
is draytel.org, then you might set draytel-1 in this field.
If you want to make VoIP call without register personal
information, please choose None and check the box to achieve
the goal. Some SIP server allows user to use VoIP function
without registering. For such server, please check the box of
Call without Registration. Choosing Auto is recommended.
The system will select a proper way for your VoIP call.
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Vigor2110 Series User's Guide