asterisk users - Dec 2004 - sipgate x asterisk: problems to receive PSTN calls?

I noticed that I'm no longer able to receive calls from PSTN to my 
SipGate DID number.

I changed the sip.conf and extension.conf as per 
http://www.voip-info.org/tiki-index.php?page=Sipgate but the problem 
remains...

However, I can receive calls from another sipgate user. The problem is 
only affecting calls from the PSTN (DID). Anyone with the same problem?