The Sangoma A400 analogue telephony card is our high density analogue card from two (2) to 24 ports for Asterisk, FreePBX and PBXact phone systems. That's up to 24 PSTN calls all on a single PCI Express slot. The modular nature of the cards allows you to mix and match between FXO and FXS interfaces, giving you the exact port configuration you need. The base A400 telephony card provides from 2-12 analogue ports using dual channel interface modules and is expandable up to 24 ports by adding daughterboards and the Remora backplane system. With hardware echo cancellation options, compatibility with most commercial grade servers and Linux operating systems and with a lifetime warranty, customers trust in Sangoma to deliver value based telephony solutions. | 
