David Beckemeyer, former CTO and co-founder of Earthlink (who runs Mr. Blog) has an interesting new SIP-based ATA device that marries the traditional PSTN with VoIP. Essentially you plug in both your PSTN connection and your Ethernet connection to the the ATA device. What's really cool about this device is that you can BYOVP (Bring Your Own VoIP Provider) that supports the SIP protocol - no monthly fees, no subscription costs, and no activation fee. Thus, you pay $120 for the PhoneGnome and that's it. Of course, you still need to sign-up with a SIP-based VoIP provider.
The other advantage of this device is that you can simply dial a phone number and if the person you are dialing also has a PhoneGnome, for instance 212-555-1212, it will route the call over IP and the call will be free. I assume when you register the device, you enter in your home phone number, and then this information is then pushed out to other PhoneGnome users ATA devices and stored locally. However, more likely David Beckemeyer has setup a SIP registrar that is queried by the PhoneGnomes when you make a phone call. Actually, scratch that. I just figured out that David has setup a website called my.phonegnome.com (obviously hosted) which is where you enter your SIP-based contacts. Guess that answers that question.
I should point out that since your PSTN connection also terminates on the PhoneGnome device, any incoming PSTN call will ring your telephone as well. So whether it's an incoming PSTN call or an incoming VoIP call, you only need a single phone to worry about. That reminds me, I wonder what the REN (Ringer Equivalence Number) of the PhoneGnome is? The higher the REN, the more phones you can connect to the ATA. A higher REN means the device can provide ring voltage to more devices connected to it. Hopefully, the PhoneGnome has a decent REN so you can simply connect the ATA to your home wall jack and power all of the PSTN wall jacks and phone devices in your house.
Unlike Skype, obviously an ATA does not require your PC in order to work. The PhoneGnome solution makes the most sense in broadband DSL environments, as opposed to cable broadband, since in DSL broadband homes they usually keep their phone line active (although "naked DSL" with no phone service is available in certain areas). I have cable broadband myself with no land line, (cellphone is backup) so I am not a good demographic for this product. Aswath, correctly points out that PhoneGnome is not unique in providing PSTN/VoIP integration. He points to SIPPhone's Call-In-One ATA. David responds to Aswath's comments in his new PhoneGnome blog you should check out.
The concept of buying an ATA not locked to a single VoIP provider is not a new one. Sipura (now Cisco) offered unlocked ATAs, as did several other manufacturers. What is "somewhat" unique about PhoneGnome is its integration with the PSTN, a Web-based SIP contact manager, as well as its BYOVP. Look for Cisco/Linksys to follow suit soon. Then again, Cisco/Linksys probably have their hands tied with partnership deals, contracts, etc. with the likes of Vonage to start offering BYOVP unlocked ATA devices.
(last I checked, Linksys did offer an unlocked ATA, but then pulled it from the market. I could have sworn they started offering an unlocked ATA again, but couldn't find anything conclusive on their website. Anyone know? Post a comment)
PhoneGnome Enables BYOVP
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PhoneGnome Enables BYOVP TrackBack URL : http://blog.tmcnet.com/mt/mt-tb.cgi/9650



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I am not sure that you can use this device with any other SIP based VoIP service provider. In that sense it is locked. Even if it allows, then you will lose many of its features.
David's comments suggests that there is no need to go to a website to register your information. I understand him to say that you buy the device, plug it in and it works. So the PSTN information is collected by some other means, namely PG dialing out to an 800 number on the PSTN and the information being collected. But I am not sure.
It is stated somewhere in their website that it has 3 REN. Still, I don't think you can simply connect this device in one jack and power all the other jacks. This does not magically overcome that issue.
In Peoplecall.com, a Spanish VoIP ITSP, we are selling Linksys PAP2 unlocked.
We have a deal with linksys, all the systems they sells in Spain are unlocked and includes a Peoplecall's SIP account.
This free account includes a spanish local public number, with NO monthly fee, incoming calls from PSTN are free and calls between devices are also free and unlimited.
You only have to pay the minutes (rated by seconds) when you call landline, mobile, international or send mobile-SMS, in prepaid fashion.
In the signup process you don't need to provide any financial information like credit card or else.
Of course, you can buy the device (65€) and forget about Peoplecall and use any other.
Are we crazy?, I tells you not, we offer a really good service, 99% sure you will stay with us and make your calls with us! ... sooner or later.
PAP-NA is the unlocked version of the Vonage PAP2, and it is not avilable to the public unless you are planning to subscribe to a service. There are however ways to "hack" or unlock the PAP2 from vonage but counter measures are being put in place by vonage to prevent that.
All in all I would rather see a IAX ATA then anything SIP based because of the lack of firewall Transversal in the SIP protocol.