asterisk users - Oct 2004 - Success with Swissvoice IP10S and SIP?

If anyone has had success in using a Swissvoice IP10S and the SIP firmware
and would like to help me, please contact me offlist. I have successfully
upgraded the phone to SIP and it registers to asterisk, but that's about it.
No dialtone, won't answer a ringing call, etc..

THanks,
Matthew