| 摘要 |
A method and apparatus for enabling enterprise customers to detect VPN protocol blocking by access network providers and provides client VPN software with instructions to activate another VPN protocol such as Secure Socket Layer (SSL) that is less likely to be blocked by their provider are disclosed. For instance, if the access network provider blocks the IPSec VPN protocol, the client VPN software will switch to an alternative VPN protocol, such as Secure Socket Layer (SSL) protocol, Layer 2 Tunneling Protocol (L2TP), or Point-to-Point Tunneling Protocol (PPTP), to connect to the VoIP network. The SSL, L2TP, and PPTP protocols are all VPN protocols designed to enable encrypted and authenticated communications across the public Internet.
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