I have been tasked with setting up a VPN from an office we are opening in Thailand to our offices here in Houston, TX. If we can get enough bandwidth possibly doing VOIP as well. Can someone tell me where to find what types of circuits are available and the associated costs. Has anyone ran into issues with this? All info is appreciated.

Yep the company that I work for in the UK (US parent company) also had a similar dilemma last year, they were chased from pillar to post and seemingly got nowhere, they will be back to try again however.

Best source of contact would be TOT.

http://www.tot.or.th/en/index.php

Maybe things have changed for the better by now, certainly in BKK I would have thought, not sure about Udon though.