How to upgrade Cisco IP Phone 7945G to SIP Firmware using Linux Box

Items you will be needing:

    - Linux Box with Ubuntu 

    - Cisco POE Switch

    - Cisco IP Phones

    - Ethernet cords

Download the files at https://software.cisco.com/download/home/281346594/type/282074289/release/9.3(1) and download 7945 and 7965 IP Firmware Files Only - Compatible CUCM Versions: 7.1(5)+

 

Install the DHCP Server by opening the Terminal and typing in sudo apt install isc-dhcp-server, then 

type in /etc/dhcp/dhcpd.conf in the terminal, press y, and paste in: 

option domain-name "example.org";

option domain-name-servers 8.8.8.8;

option tftpserver code 150 = array of ip-address;

default-lease-time 600;

max-lease-time 7200;

authoritative;

subnet 192.168.199.0 netmask 255.255.255.0 {

range 192.168.199.10 192.168.199.240;

option routers 192.168.199.254;

option subnet-mask 255.255.255.0;

option broadcast-address 192.168.199.255;

option tftpserver 192.168.199.2;

}

Then follow this guide online to install the TFTP server at https://help.ubuntu.com/community/TFTP

Here is a diagram of the Linux Box, POE switch, and the IP Phones.