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VPN Server
With VPN connection, you can set up multiple VPN clients to access Yeastar S-Series VoIP PBXsecurely.
OpenVPN Certificates and Keys
Before you start to set up the OpenVPN network, you need to make the related certificates and keys for VPN server and VPN clients.
Check the Generated OpenVPN Certificates and Keys
After generating certificates and keys on the Command Window, you can find the certificates and keys in the %ProgramFiles%\OpenVPN\easy-rsa (e.g. D:\OpenVPN\easy-rsa).

Check the Generated OpenVPN Certificates and Keys

After generating certificates and keys on the Command Window, you can find the certificates and keys in the %ProgramFiles%\OpenVPN\easy-rsa (e.g. D:\OpenVPN\easy-rsa).

Table 1. Explanation of generated certificates and keys
File	Needed by	Purpose
ca.crt	server and clients	Root CA certificate
ca.key	key signing machine only	Root CA key
server.crt	server only	Server Certificate
server.key	server only	Server Key
client.crt	client only	Client certificate
client.key	client only	Client key
dh2048.pem	server only	Diffie Hellman parameters. Note: If the `KEY_SIZE` in the vars.bat file is set to `1024`, the DH PEM file name is dh1024.pem.
ta.key	server and clients	TLS authentication key. Note: If SSL/TLS is enabled on the OpenVPN server, you should upload the ta.key to the OpenVPN server and OpenVPN clients.