I'm fairly new to the whole VPN aspect of networking. I currently have a domain setup with SBS 2003, and our company is opening a new office. We will be installing 1 T1 line at the current location (about 25 users with VoIP thru Jive), and 3-4 T1 lines at the new location (about 65 users with VoIP thru Jive).
The current location has a domain setup with a cable modem. I would like to add the new server to this domain and be able to share resources and be on the same network. I know VPN is one of the ways to do this.
I do not know where to start. I've been told to let the ISP handle the VPN tunnel, but that may prove costly. Any references or steps I can follow? Also, what type of hardware would I need to connect this?