Draytek vigor2920 series User Manual page 313

Item
STUN Server
External IP
SIP PING interval
Available settings are explained as follows:
Item
Profile Name
Register via
Description
Type in the IP address or domain of the STUN server.
Type in the gateway IP address.
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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Vigor2920 Series User's Guide