Draytek Vigor 2110 User Manual page 238

Item
SIP PING interval
Click the index number to configure an SIP account.
Available settings are explained as follows:
Item
Profile Name
Register via
Description
The default value is 150 (sec). It is useful for a Nortel server
NAT Traversal Support.
Description
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