Skype over VPN

Secure Lync (Skype for Business) over VPN


  • Enables using Skype over VPN
  • Split authentication traffic from A/V
  • No infrastructure changes required
  • Allow device access control
  • Optimal user experience

SkypeShield offers an innovative solution for using Skype for Business (Lync) on Virtual Private Networks (VPN) in a seamless user experience without compromising on quality of service.

The solution is ideal for organizations seeking to leverage their existing VPN infrastructure to secure their Skype deployment. The solution offers device access control in the case of the VPN access being controlled by MDM or certificate, which are available for approved devices only.

Microsoft recommends moving all voice and video traffic through the Internet and not over VPN. Deploying Skype over VPN results in quality decrease and service latency because of double encryption of Skype traffic over VPN.

SkypeShield hybrid solution splits the traffic. Establishing the connection goes through VPN while audio/video traffic is routed through the Edge over the Internet as required by Microsoft. The solution does not require any changes in the VPN infrastructure (split tunneling).

Organizations using SkypeShield can verify that only devices with corporate VPN access can connect to Skype to complete the authentication process. At the same time, it enables the transfer of the majority of Skype traffic (audio/video) to pass through the Internet resulting in optimal user experience.

From an end user prospective the transition between the VPN tunnel for authentication and the Internet for ongoing usage is automatically performed by SkypeShield to preserve optimal user experience. By using this approach, SkypeShield can redirect any unregistered device to the VPN for registration. Once the device has accessed SkypeShield, via the VPN, the device is registered. The Skype client is then redirected to continue the remainder of the session outside the VPN.

SkypeShield can be configured to require VPN access at every authentication attempt or only once for registration. In such a case, the device will require no VPN access in subsequent sessions as it will already be registered with SkypeShield.

Requiring VPN access at each authentication attempt offers a three-factor authentication based on credentials, device and VPN access.