You can config the vpn server on the web GUI, download the config_openvpn file, then separate this file to three files that you need.
For the sample. you can refer to the attachment.
i test your certificate files and its ok
but i have a new problem ,
my IPPhone can get Open vpn IP ,but my extenion cant register in pbx
i check id and password and enabel nat traveling in ext settings
Please check if the UC and IP phone can reach each other via virtual IP address.By the way why not give us your skype ID .It will be more easier to communicate.
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Skype: This email address is being protected from spambots. You need JavaScript enabled to view it. live:echo.yuan_1