Programming SIM card RAND?

Hello, I'm trying to get some MS test equipment working and have programmed a SIM with pysim-prog.py, but the tester has a configuration field for RAND and I cannot see how to set this on the SIM. In fact this has confused me as I thought the network always supplied this... I have the IMSI, Ki, MCC and MNC set the same on the tester and SIM, but tests don't get very far and fail with "incorrect SRES". Any ideas? Regards, Andrew -- Andrew Back http://carrierdetect.com