Linksys SPA9000/SPA400 Support ForumTechnical support, how-to guides, troubleshooting, and general assistance for the Linksys Voice System (LVS) family of products.
The only way I could change the Caller ID a00.... was updateing the firmware.
The only problem is that updating the firmware now I have problems with calls....sometimes they got disconnected and sometimes I can not hear anything if line 1 is bussy and I am in line 2.