Draytek Vigor2820 Series User Manual page 183

OP Number
Min Len
Max Len
Route
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 with 886.
Replace - When you choose this mode, the OP number will be
replaced 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 prefix number of 03 will be
replaced by 8863. For example: dial number of "031111111"
will be changed to "88631111111" and sent to SIP server.
The front number you type here is the first part of the account
number that you want to execute special function (according to
the chosen mode) by using the prefix number.
Set the minimal length of the dial number for applying the
prefix number settings. Take the above picture (Prefix Table
Setup web page) as an example, if the dial number is between 7
and 9, that number can apply the prefix number settings here.
Set the maximum length of the dial number for applying the
prefix number settings.
Choose the one that you want to enable the prefix number
settings from the saved SIP accounts. Please set up one SIP
account first to make this interface available. This item will be
changed according to the port settings configured in VoIP>>
Phone Settings.
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Vigor2820 Series User's Guide