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C# and Algorithmic Thinking for the Complete Beginner – Second Edition. C++ and Algorithmic Thinking for the Complete Beginner – Second Edition. At this point, you should be able to connect the phone and the server to an isolated switch (no other DHCP servers present) and reboot the phone and it will find its files. May have to edit permissions on the files (I can't remember):. $sudo nano /var/lib/tftpboot/SIPDeafult.cnf Copy the files you located in step 1 to the tftpboot root (filenames probably different for your phone):. #option voip-tftp-servers code 150 = ip-address $sudo nano /etc/dhcp/nf default-lease-time 600 The phone needs to know where to look for its files.): $sudo apt-get update & sudo apt-get install isc-dhcp-server tftp-hpa xinetdĮdit the DHCP config file and restart DHCP server (this way, the DHCP server will answer the option 150 request that the 7900 phone sends when it starts. On the VM, edit /etc/network/interfaces with a static address and restart networking: Once you have the image(s), I would start a fresh Debian based VM (Ubuntu Server on VirtualBox in my case.) In Settings->Network, set the guest to have a 'Bridged Adapter' on the hosts ethernet port. For me, the ninth result has the downloads. Otherwise, search Google for 'cisco 79xx sip image'. If you have an account with Cisco, you may be able log in and search for an image there, but you will probably need to purchase a license. 
The hard part is finding an image for your phone. The environment that this phone came from would have had the image for it to boot from when it restarts. The confusing part is, the screen probably displays the SIP symbol, so it’s tempting to think that it doesn’t need to search for an image, but it does. In my experience, there is no way to bypass this other than connecting the phone to a network where there are DHCP boot options that point to a TFTP server setup with the SIP image. Your phone is actually searching to download its firmware/operating system.
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