you need all in one small IP PBX in home, and your voip ata can be registered with this IP PBX any where, so you can talk free with your family, and make calls to PSTN via your PSTN line
Yes, you need FXS ports (extension) of PBX to connected with router's FXO ports;
FXS only can be connected with FXO ports, anD FXO also only can connected with FXS ports;
the best soluiton for your application should be below:
IP PBX in head office ,and VoIP Gateways or IP phone in branchs; VoIP Gateways and IP phones will be registered with IP PBX, so that all extensions can dial directly, and the features like conference calls, call transfer, unified IVR...
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