Draytek Vigor2760 Series User Manual page 216

Note: If the incoming or outgoing calls do not match any entry on the phonebook, the
router will try to make the call "being protected". But, if the call ends up "unprotected"(e.g.
peer side does not support ZRTP+SRTP), the router will not play out a warning message.
D D i i g g i i t t M M
For the convenience of user, this page allows users to edit prefix number for the SIP account
with adding number, stripping number or replacing number. It is used to help user having a
quick and easy way to dial out through VoIP interface.
Available settings are explained as follows:
Item
Enable
Match Prefix
Mode
Vigor2760 Series User's Guide
a a p p
Description
Check this box to invoke this setting.
It is used to match with the number you dialed and can be
modified with the OP Number by the mode (add, strip or
replace).
None - No action.
Add - When you choose this mode, the OP number will be
added with the prefix number for calling out through the
specific VoIP interface.
Strip - When you choose this mode, the OP number will be
deleted by the prefix number for calling out through the
specific VoIP interface. Take the above picture (Prefix
Table Setup web page) as an example, the OP number of
886 will be deleted completely for the prefix number is set
206