I know friends who use DD-WRT router as the VPN server. (In your case, placed in your Company)
Then connect to it from elsewhere within China using simple PPTP
Your slow international internet speed is not just caused by the GFW,
China Telecom implement a type of net neutrality, this means you need to buy
an extra package called VIP High Speed International Internet
it costs an extra 50 RMB/month.
expect the latency, the ping to west coast US drop from 300-500 ms to about 150 ms and be stable
With your A/C details
Call CT on 10000
Press whatever for English service
Request to enable international high speed internet (开通国际金品网)
Agree to pay extra RMB 50 per month