problem with secret

Hi list, I'm using Freeradius 1.0.2 and receiving request from Squire SVI Softswitch as NAS. The problem is that Squire softswitch is not sending to freeradius the shared secret in request accounting. So, I need accept accounting request from a NAS that does not send secret. I know that secret is mandatory in clients.conf, but I need solve this... Who can help me ? Thanks in advance, Guido