If both you and your parents have Obi boxes, can't you just call each other for free using the Obi's own 9 digit number to call one Obi from the other?
I've never tried it as I don't know anyone else using this kit but it doesn't require a voip provider. If your parents are not going to use the Obi for anything else but calling you then why pay for anything else?
Some one else may be able to help with the setup either here or at the obihai.com forums.
This is by far the easiest method. Did you know that you can even make use of the Obi digit maps parameter to give each Obi device it's very own unique phone number?
As you may know, each Obi device has its own dedicated Obi telephone number that is hard coded into its firmware, it's generated based on the device serial number and cannot be changed. e.g. 222 222 222 but what if you don't like the format or you want a shorter easier to remember number? No Problem, read on...
Mum is in the UK and she has an Obi100, mum's Obi number is 257 250 876
David is in the USA and he has an Obi202, David's Obi number is 851 693 756
They can dial each other and talk for free simply by dialling their assigned Obi phone numbers. Wouldn't it be easier though if you could change Mum's Obi number to match her existing landline number that she has had for years, the one you know off by heart? or maybe give her an easy to remember short number such as 1234? Well you can!
All David would do is add <1234:257250876> to his Obi digit map, now when he picks up his phone and dials 1234 his Obi202 calls his mum's Obi100 device and they chat.
Mum in turn could add <1234:851693756> to her Obi digit map, now when mum picks up her phone and dials 1234 her Obi100 calls David's Obi202 device and again they chat.
How cool is that :lol: