Grandstream
HandyTone ATA-286 is an award-winning next generation VoIP
analog telephone adaptor based on industry open standards.
Built upon innovative technology, Grandstream HandyTone ATA-286
features market leading superb audio quality, compact size,
and rich functionalities at highly-affordable price.
Comprehensive HandyTone Series comparison table:

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FXO port allows local and remote PSTN-to-VoIP call origination
and VoIP-to-PSTN call termination, automated call routing
through PSTN, and power fail-over. PSTN Pass-through allows
local PSTN line service for income/outbound call and failover.