ISDN Problems

[CyberDyne Systems 0]

I am having a problem using my ISDN device in Win2k. The ISDN TA is a Zyxel ISDN omni.net LCD. When I try to connect to my isp with both B-channels (128kbit), the connected tray icon shows that I am connected in 64kbps, although I have declared in the modem protocol that I want 128kbps and both channels enabled. The ISDN Device opens up both channels and connects at 128kbit, but Windows insist that I am on 64.Moreover the speeds I get are rather disappointing. I get 7K/sec with 64kbit and 10-10.5 kb/sec with 128kbit. Please help me get through this. I dont really care about what windows say, I just want my old 14k/sec speed back.