try negotiate with tm for a better line. sometimes they are willing to reroute some cables for you.
last time my ex company we are able to grab a seperate line from another exchange so the speed is more consistent.

and you should be able to get 4mbps fixed ip. tell them you are mnc and is expanding in the area blah blah.

for office to office i used netgear vpn box. http://www.netgear.com/business/products/s...-VPN-firewalls/