Looking at things I'm thinking I will need Obihai 200 (can't envisage needing two connections) with line adapter. I will then need to run an phone extension kit from the main socket into the office so that I can place the Obihai near my router. Having said that from reading things do I need some sort of special cable as the connection of the back of the device is US style and if so what is it that I need and does it come in long cables or will I have to fit a box in my room and then use another lead between the extension box and the device? So basically swapping the base and additional handset locations.
I will be getting a Post Office Line Rental Saver deal which works out at £12 per month and includes weekend calls as standard (£2.50 extra and I can evenings and weekends) which is a significant saving on my current TalkTalk package which is nearly £23 per month. I mention this because that means some times it will be better to route calls through the normal landline service and other times through VOIP. I believe you cannot automate this with the Obihai however I have a raspberry pi 2 going spare as I've recently moved my last project off it on it's own VM on my main computer and I've seen that there is RasPBX which might allow me to do that if I did get my setup working and wanted to refine things a bit more. Is this possible?
Any comments or opinions on my proposal?