Am running a dial-up set-up on a 3COM Total Control NAS, with HiperARC ver 5.0.9 and HiperDSP 3.5.13 (ISDN) and HiperDSP E1R2 ver 2.1.9. The situation is when I connect with to the ISDN line speed of 31kbps are achieved. The R2 line rings busy with as few as 5 calls terminated but can achieve connection speeds of up to 50Kbps. Anyone with an idea?