How to Add and activate PPTP or L2TP VPN connection?
<p>i am developing the one SIP based application to make and receive a calls. In which i need to access a PPTP VPN connection because in some countries VOIP and SIP are blocked.If i use VPN connection then calls will not block even VOIP and SIP are blocked in that country. So how do i add a new PPTP VPN connection? </p>
