Hi........I would like to give u three suggestions (use only one and preferably the first)
1. http://www.trackzapper.com/download/tzcb.exe
u can download it for free.Install it and u can use it to take ur modem for a rollercoaster ride above 115.2K
If u didnt like go thru this go for http://www.exefind.com/adsl-modem/
Last resort.......I dont guarantee
2. http://www.devdrv.com/shsmod/ (for all types)
3. http://www.mev.co.uk/usbbaudspoof.htm/ (only for particular handsets)
Hope this will solve ur problem.....
Unleash ur port!!!!!!!!