Cisco IP phone recovery procedure
If you have this kind of problem - phone won't boot, not showing anything on screen upon powering etc. - and you tried softreset (123456789*0#) and hard one (3491672850*#), then you should give this option a try...for this to work you would need: - tftpd32 software ( http://tftpd32.jounin.net/tftpd32_download.html ) - adequate firmware files for your 7900 phone ( www.cisco.com ) - local power adapter for IP phone - power cube 3,4 typically. You are going to use tftpd32 software for locally provision of firmware to IP phone and as a DHCP server for same phone with required option 150 in it. Required steps: - configure your PC with static IP address - some value from your test DHCP pool. If you are going to use, let's say, 192.168.10.0/24 pool, then you can give your PC - for example - 192.168.10.100/24, with default gateway also 192.168.10.100; - configure tftpd32 DHCP options as per picture: - configure tftpd32 TFTP options per your environment and put your firmware files in