How to configure BSNL SIP Trunk on Asterisk or Issabel
BSNL now provides SIP Trunk with DIDs in genreal they call it SIP PRI and asking you to buy channels as they were selling copper PRI links .Now they are providing same service with fiber optice cables on FTTH connections.
They are giving fiber link as same they are providing FTTH internet services with ONT and providing PRI service through SIP Protocal over the VPN using OPEN VPN or SoftEther .
Depend on your convinent they are asking which VPN service you will use . Here I am using OPENVPN. But before implementing SIP PRI from BSNL as I was thinking it can be use over OPENVPN from any internet network .
but they have played the game that there OPENVPN server can be accessed by only there network they have provided and sip server can be access only over VPN connection .I dont know why they have used OPENVPN if you are using IP based security and SIP authentication and SIP registration . they have just made it complicated if your Applicance does not support OPENVPN then you have to used additional device or router which support OPENVPN.then you can reach there SIP Proxy server.
Now below are the breif steps to configure BSNL SIP trunk
