Yealink SIP-T48G Administrator's Manual page 625

Parameters
Web User Interface:
Network->Advanced->VPN->Active
Phone User Interface:
Menu->Settings->Advanced Settings (default: admin) ->Network->VPN->VPN
Active
openvpn.url
Description:
Configures the access URL of the *.tar file for OpenVPN.
Example:
openvpn.url = http://192.168.10.25/OpenVPN.tar
Note: It is not applicable to SIP-T19(P) E2 IP phones.
Web User Interface:
Network->Advanced->VPN->Upload VPN Config
Phone User Interface:
None
To upload a TAR file and configure VPN via web user interface:
1. Click on Network->Advanced.
2. Click Browse to locate the TAR file from the local system.
Configuring Advanced Features
Permitted Values
URL within 511 characters
Default
Blank
605