Draytek Vigor2110 Series User Manual page 216

Click any index number to display the dial plan setup page.
Enable
Phone Number
Display Name
SIP URL
Dial Out Account
Loop through
Backup Phone Number
Click this to enable this entry.
The speed-dial number of this index. This can be any number
you choose, using digits 0-9 and * .
The Caller-ID that you want to be displayed on your friend's
screen. This let your friend can easily know who's calling
without memorizing lots of SIP URL Address.
Enter your friend's SIP Address.
Choose one of the SIP accounts for this profile to dial out. It is
useful for both sides (caller and callee) that registered to
different SIP Registrar servers. If caller and callee do not use
the same SIP server, sometimes, the VoIP phone call
connection may not succeed. By using the specified dial out
account, the successful connection can be assured.
The selection should be as the following:
When the VoIP phone is obstructs or the Internet breaks down
for some reasons, the backup phone will be dialed out to
replace the VoIP phone number. At this time, the phone call
will be changed from VoIP phone into PSTN call according to
the loop through direction chosen. Note that, during the phone
switch, the blare of phone will appear for a short time. And
when the VoIP phone is switched into the PSTN phone, the
telecom co. might charge you for the connection fee. Please
type in backup phone number (PSTN) for this VoIP phone
setting.
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Vigor2110 Series User's Guide