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Review title: Be Warned! Not a true FXS/FXO device
Product review: If you plan to use this with Asterisk, be warned. You CANNOT use this device as true independent FXS and FXO devices like you can the Linksys SPA3102. If you want to use it as a FXO (PSTN) device only, you can, but you MUST make it ANSWER the incoming call and hotline dial it to send it anywhere. If you are planning on using this with a software PBX like Asterisk, I recommend you see if you can find a good working example somewhere before you buy it. If you want to use it as a stand alone device to route 911 (and/or local) calls to a PSTN line and have it connect to a VoIP provider to save money, it will work great. If you want to use it to provide you with a FXS port and a FXO port and you'll handle the SIP traffic yourself with something like Asterisk, don't buy it.
