Draytek Vigor2850 Series User Manual page 257

SIP PING interval
Click any index link to access into the following page for configuring SIP account.
Available settings are explained as follows:
Item
Profile Name
Register via
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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Vigor2850 Series User's Guide