Dear Sir, We are going to install IP-PBX in our company. Still we don't decided that we are going to install 3CX or Trixbox. But I am looking for Telephony Analog Card, which can connect to 4 lines from Ministry of Communication (PSTN Line) to my IP PBX and If in same card I can connect only 1 analog phone with eco cancellation. Kindly help me which model of card I should buy which can help me in both 3CX and Trixbox. If you some video how to connect then it will be very helpful.