In this case, the only line in the file contains “P003-8-12-00” without the quotes. OS79XX.TXT – This is just a one-line file that specifies the firmware to load.Let’s take a quick minute to discuss some of the files that are in here. The directory for my TFTP server (C:\Users\Anthony\Desktop\phoneTFTP) looks like this: Set the server interface to whatever interface is associated with the phone network. Set the “Current Directory” to whatever directory you will use to serve the config and firmware files out of. Download and install the software, then launch it. I recommend using TFTPD32 since it’s simple and easy to set up on Windows. Step 2: Configure a TFTP server to serve the configuration and firmware files. TFTPD32 also includes a DHCP server, but I have not used it. Option 150 specifies the TFTP server that the phones will use to obtain their configuration and firmware. There are many different DHCP servers that you can use to accomplish this process, but I just used the one on my Meraki MX60. The server must be able to serve an IP address and DHCP option 150 to the phones. Step 1: Configure a DHCP Server with Option 150 for TFTP. Switch the firmware between SCCP and SIP a few times, just to see how magically easy it is when the instructions actually work.īefore we get down to business, here’s the topology that I used for this tutorial: Boot the phones and watch the magic happen.Create an file with the load information and place it in the TFTP directory.Configure a TFTP server to serve the configuration and firmware files.Configure a DHCP Server with Option 150 for TFTP.However, the basic idea behind the upgrade is fairly simple: Your mileage may vary based on the firmware you have installed and the firmware you are upgrading to, since Cisco seems to mess with this process a lot (because, you know, why would we even dream of being consistent?). I captured packets, messed with files, and distilled my frustrations into (what I hope is) a comprehensive article. These instructions were created after hours of trying to understand firmware upgrading on the 7940s. You Google around for firmware upgrade instructions, only to find that the vast majority of “tutorials” are completely unhelpful, wrong, or missing some critical component of the process. So, you picked up a few cheap Cisco 7940s on eBay with the hopes of using SIP and Asterisk, but you don’t really feel like using Call Manager Express (mainly because you don’t want to drop more money on a router).
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March 2023
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