I want to set up a permanent VPN tunnel between a main office and new second office location primarily to connect some Aastra IP phones to the Aastra PBX at the main office.

At the main office we have a 2820Vn device, is this suitable for our needs and is it best to get another 2820Vn for the second office or another Draytek device.

After reading some of the FAQ's I have become more confused as to the best requirements. Any help or advice would be greatly appreciated.