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Yealink SIP-T23P Руководство администратора онлайн [589/841] 166941

Configuring Advanced Features

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VPN (Virtual Private Network) is a secured private network connection built on top of

public telecommunication infrastructure, such as the Internet. It has become more

prevalent due to benefits of scalability, reliability, convenience and security. VPN

provides remote offices or individual users with secure access to their organization's

network. There are two types of VPN access: remote-access VPN (connecting an

individual device to a network) and site-to-site VPN (connecting two networks together).

Remote-access VPN allows employees to access their company's intranet from home or

outside the office, and site-to-site VPN allows employees in geographically separated

offices to share one cohesive virtual network. VPN can be also classified by the

protocols used to tunnel the traffic. It provides security through tunneling protocols:

IPSec, SSL, L2TP and PPTP.

IP phones support SSL VPN, which provides remote-access VPN capabilities through SSL.

OpenVPN is a full featured SSL VPN software solution that creates secure connections in

remote access facilities, designed to work with the

TUN/TAP

virtual network interface.

TUN and TAP are virtual network kernel devices. TAP simulates a link layer device and

provides a virtual point-to-point connection, while TUN simulates a network layer device

and provides a virtual network segment. IP phones use OpenVPN to achieve VPN

feature. To prevent disclosure of private information, tunnel endpoints must authenticate

each other before secure VPN tunnel is established. After VPN feature is configured

properly on the IP phone, the IP phone acts as a VPN client and uses the certificates to

authenticate the VPN server.

To use VPN, the compressed package of VPN-related files should be uploaded to the IP

phone in advance. The file format of the compressed package must be *.tar. The

related VPN files are: certificates (ca.crt and client.crt), key (client.key) and the

configuration file (vpn.cnf) of the VPN client.

The following table lists the unified directories of the OpenVPN certificates and key in

the configuration file (vpn.cnf) for Yealink IP phones:

VPN files

Description

Unified Directories

ca.crt

CA certificate

/config/openvpn/keys/ca.crt

client.crt

Server certificate

/config/openvpn/keys/client.crt

client.key

Private key of the client

/config/openvpn/keys/client.key

For more information, refer to

OpenVPN Feature on Yealink IP Phones

Note

VPN is not applicable to SIP-T19(P) E2 IP phones.

Yealink SIP-T23P Руководство администратора онлайн [589/841] 166941

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