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Strengths: Small Form Factor (4" x 4" x 1"),
Supports SIP - Leading VoIP protocol,
Internal FXO FXS and IP routing (see below),
Supports PINs (extend international calling to cellular)
Weaknesses: Typically must buy with a service plan or for a high price, the price at buy.com makes this a steal.
Summary: First off, this device has an FXO and an FXS port. Many of you may not know what that means, or what it can provide you. The FXO means I can connect it to the Public Switched Telephone Netork (e.g. POTS (Plain Old Telephone Service) line at home that you get from AT&T, or could be "digital phone" from Comcast, etc) and the FXS allows me to connect any home phone (e.g. cordless gigaset, etc). Not too many devices support both (most devices support either 1 or 2 FXS ports), and while a few others do, this is where this device from Linksys beats all of the others out. This device has routing between the interfaces and that makes it far superior than anything else on the market. That means that I can
a) Use my cellular phone to dial my phone analog line and based on caller ID prompt for a PIN and then allow connections over my VoIP (Voice over Internet Protocol) connection
This is valuable because
a) It allows me to reach friends while away from my PC that are using VoIP, but don't have a PSTN number in the US. I can call home using my cellular and reach them.
b) This device also allows me to route all of the calls out of the IP interface
-- Be able to use this device as a forwarding service when I am not home, but want the calls to reach me. I could pay my POTS provider $5/month + 20 cents a minute, but why then I can route to any number in the world and pay nominal fees (since these are pay as you go, many have 1 cent in the US per minute).
-- I may be able to also have this device route calls to voicemail via a free VoIP service (FWD, VBuzzer, SIPphone, etc). Typically these providers give you a personal greeting and send the recorded file via email. If you have yahoo, you can send an SMS (Short Message Service) of the message received, but not be able to get to it unless you have email. This is exactly what I would want to do when traveling abroad as it's cheap to go to an Internet cafe, but very expensive to call home to see if I have a message, who it is from, etc.
The opposite is true of my friends who have VoIP service. I believe I can have the call come into the VoIP interface and then with PIN (and/or maybe caller ID), route the call out of my POTS interface to my cellular number.
This should save me some serious $$$ by not having to voicemail with my POTS provider, or dealing with an answering machine at home.
I'm not sure how best to configure this yet as I just got this device, but so many more things are possible with this device, esp. when coupled with other services and or products.
If I can share my actual experience later on appended to this review, I will!

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