Pinchy,
This is actually my third time trying to reply to this post. First was way too long, so I deleted and tried to shorten it. The second one ended out just as long, and my little boy turn the PC off on me before I finished, so this is attempt 3, which will be much briefer.
VOIP
In short, it can do everything you wanted it to do from your posts below. The ATA will give you the exact same functionality as a standard eircom line. You can plug a standard landline phone (portable, DECT or whatever) into it and use it just as you would a normal landline. Think of an ATA as your main eircom phone socket basically. With regards whch ATA, I can only advise based on what I am using, which is a combined Wireless router and ATA by linksys. The advantages are functionailty, and the fact that you get two devices in one., but also the combined router/ata will actually allow you to prioritise voice traffic over everything else should your BB connection be put under pressure, it will ensure your voice gets bandwidht first. Wiring throughout the house is possible, as I said, think of your ATA as your main telephone socket, this is what I have done. However, a much easier solution would be to use DECT phones, which basically allow you to spread them around the house, but only having to have one base unit plugged into your ATA. much simpler. Local numbers are allocated by blueface (I have an o21 number, and again use is exaclty the same as a landline. Anyone can call you on it from anywhere in the word, there are no limitations in this regard
Automation
You can do what you want relatively easy, and the unit you pointed to in your post (the SC2800) will give you remote access as you want. However, this unit has a lot of limitations. Rather than go into them in great detail, I would suggest you look at two other items, just to see the functionality that is available first to compare to the SC2800. I am not syaing the SC2800 wont to it, it will, but in a very, very limited way.
Look at the follwoing units and spend a bit of time comparing them. They are basically "intelegent controllers" and these will be the brains behind your system. If you get this part right, addinbg and expanding your system will be a breeze
Have alook at these links and let me know what you think
Comfort System
[broken link removed]?
[broken link removed]&
Homevision Unit
[broken link removed]?
www.csi3.com
Entry level intelligent Controller
[broken link removed]?
ATA/Router info
https://www.blueface.ie/shop/getDevice.aspx?device=&payg=&extras=&page=plans&plan=IEUKUNLMTD&x=24&y=4
Look into the controller options in a bit more detail on the links above and let me know what you think. I personaly would steer you towards the comfort system as a replacement for your existing alarm system, particularly if you were up to self installing your own alarm system.
Let me know what you think.
Regards,
Eamon