We've had some issues with linking our sites together and also with sharing files over VPN. The current environment has 3 locations, and the main location has 3 T1 lines to support a VOIP phone system and transferring files from one location to another. The other 2 locations have 2 T1 lines.
Location I has 35 users (3 T1 lines), Location II has 15 users (2 T1 lines), and Location III has 5 users (2 T1 Lines).
What would be your recommended approach to improve VOIP traffic and provide better connections between sites?