I am also on TimeWarner and I'm having a trouble with a hacker in Taiwan. Have you logged into the Obitalk portal and looked at your system settings?
Mine shows my GoogleVoice going to 22.214.171.124. Check your Portal to make sure you aren't also getting re-directed.
Also, goto pingtest.net and see what line quality you get and then goto speedtest.net or www.timewarnercable.com/East/learn/hso/speedtest.htm
and see what speed results you get.