Reddit reviews Quad Span FXO FXS Card with 2 FXO +2 FXS modules,Supports Issabel FreePBX Asterisknow Asterisk Card PCI,For VoIP Telephone System SIP Phone Appliance
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PCI InterfaceSupports Asterisk, Freepbx,Issabel,Trixbox...FXS FXO asterisk Card with 2 FXO+2 FXS ports.* FXO module is red,FXS module is green,the FXO port connects the traditional telephone line(landline), the FXS port connects the traditional telephone.Quad Span Analog FXS FXO CardUsing the card, PC and open source softwares,such as Asterisk,FreePBX,Issabel (elastix 4),you can build a telephone system/ VoIP PBX / call centre /SIP server/VoIP Gateway Trunk appliance based on the card easily at a very low cost.
You need a FXO port on your system or to port to a VoIP provider. This card has 2 FXO ports (2 landlines) and 2 FXS ports (2 Analog Phones) and plugs into a PCI slot, you can also get versions that go into a PCI Express slot: https://smile.amazon.com/Supports-Asterisknow-Asterisk-Telephone-Appliance/dp/B079YSNXD8/ref=sr_1_3?hvadid=77996705187818&hvbmt=be&hvdev=c&hvqmt=e&keywords=fxo+card&qid=1555772002&refinements=p_85%3A2470955011&rnid=2470954011&rps=1&s=gateway&sr=8-3