Draytek Vigor2820 Series User Manual page 194

For Vigor2820VS/Vigor2820VSn models, you will see the following page:
Phone List
Vigor2820 Series User's Guide
Port – For Vigor2820V/Vigor2820Vn, there are two phone
ports provided here for you to configure. However, for
Vigor2820VS/Vigor2820VSn, there are three phone ports
provided here for you to configure. Two (Index 1 to 2) are
fixed and one (Index 3) is configurable.
Phone1/Phone2/Phone allow you to set general settings for
PSTN phones. ISDN1-S0 and ISDN2-TE allow you to set
common settings for ISDN network connection. ISDN2 port is
configurable. Please use the drop down list to choose
ISDN2-TE for Internet connection or choose ISDN2-S0
(ISDN intern) for ISDN phone. In addition, you can connect
six phones to this router in certain case. Please refer to Section
4-1 for detailed information of ISDN phone/network
connection.
If you want to enable function of ISDN On-Net/Off-Net, you
have to choose ISDN2-TE.
Call Feature – A brief description for call feature will be
shown in this field for your reference.
Codec – The default Codec setting for each port will be shown
in this field for your reference. You can click the number
below the Index field to change it for each phone port.
Tone - Display the tone settings that configured in the
advanced settings page of Phone Index.
Gain - Display the volume gain settings for Mic/Speaker that
configured in the advanced settings page of Phone Index.
Default SIP Account – "draytel_1" is the default SIP account.
You can click the number below the Index field to change SIP
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