Hello, I'm trying to configure the DHCP pool option 150 with two ip addresses however cannot guess the syntax for that. In the KB16352 I see 'DHCP option 150 supports a list of TFTP servers (Multiple Server IPs)' How to configure 2 server IP? Thanks, Dmitry.
Table of Contents.IntroductionIn this post we will learn how to upload SIP firmware to Cisco 7911 IP Phone. This will make possible using the phone with third party SIP servers. The instruction below applies to all Cisco 7900 series IP phones. Download the SIP firmware.Before we start, let’s download the required SIP firmware files.Go to and get the required SIP firmware files. Make sure you download the right SIP firmware for your phone model in a ZIP package.
Below is a screenshot showing the 8.5.2 version firmware package for 7911 IP phone. Download TFTP server.Go to and download the TFTPD32 or TFTPD64 server, which is a tiny TFTP server, required to serve the firmware files to the IP phone.Extract all files from the previously downloaded package to the TFTP directory. The image below shows the content of the TFTP root directory. Option 150Before we reset the IP phone you we need to configure our DHCP server to provide the IP address of TFTP server to the IP phone. Otherwise, the phone will not know where to download the firmware files from once it boots.I’m using Cisco switch in my lab and configured very primitive DHCP server like this:ip dhcp pool TESTnetwork 10.0.0.0 255.0.0.0option 150 ip 10.0.0.10The IP address of my laptop running TFTP server is 10.0.0.10. Option 150 should point to the IP address of TFTP server.
You may use any other DHCP server, just make it provides option 150 to your phone. Reset the phone.Now let’s hard reset the phone:. Unplug the power cable(or Ethernet in case of PoE) from the phone. Hold # and then plug it back in. Continue to hold # until the message LED on the handset flashes on and off in sequence in red. Release # and press 123456789.0#Once the phone boots up it will download the SIP firmware files from the TFTP server and activate the new firmware. VerificationThe Menu of the phone running SIP firmware looks a bit different from the phone running SCCP firmware.
It will show some new SIP related menu entries. You can find the information about the new firmware on the web interface of the phone which is enabled by default: ConclusionNow your Cisco IP phone is ready for use with any third-party SIP server.
Thank you for reading ?.
If your DHCP server is running from TFTPd32, the phone isn't able to get an IP address from it. I've never really had luck with getting that to work before from TFTPd32. You can manually set an IP address if you want or you can use some other DHCP server that the phone can reach.
If you use another DHCP server you can set the option 150, or option 66 on the DHCP scope to point to your computer for TFTP. Alternatively you can set on the phone under your network config, Alternate TFTP to Yes, and then manually type in your TFTP address which would be your computer running TFTPd32. If you have a Cisco router you can use these commands to setup a DHCP server on it and point the option 150 (TFTP) to your computer:ip dhcp pool phonenetwork 192.168.1.0 255.255.255.0default-router 192.168.1.1option 150 ipMany home routers do not allow you to configure an option 150, if you phone is rebooting on you, it sounds like you cannot get into the settings to enter in a manual IP address and TFTP server. I haven't had experience with many other DHCP server software for windows, here's one I found on google, not sure if it allows for option 150 or option 66 configurations.
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February 2023
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