Convert 7940/7940 Cisco IP Phone from SCCP to SIP

I work for a call center and I work with a 7942 Cisco IP Phone. I’m always impressed by the quality of the phone. The feature that I love a lot would be the speaker phone. I thought it would be a perfect addition to my room and so I searched for it online and see where I can get a good deal. I was lucky enough to get multiple phones for a cheap price on Craigslist. At that time, my dad was telling me that you can convert SCCP to SIP only if you are a Cisco Certified so I had to do some digging online. I found a lot of tutorials on how to do it and sites where you can download firmwares and upgrade it via TFTP.

I have read a lot of tutorials and all of them seemed to vary. I followed one after another until I got the hang of it. (trial and error, I know it is not good especially when messing with firmwares. I do it a lot..)

Continue reading “Convert 7940/7940 Cisco IP Phone from SCCP to SIP”

How to check firmware version for Cisco IP Phone 7940/7960

This process is a requirement before any firmware upgrade is done with a Cisco IP Phone. If you want to know more details on how to upgrade your firmware to SIP firmware, click here for my tutorial.

Boot up your phone. You can use either PoE or a power supply.  I used a power supply without plugging any internet connection. It will display “Ethernet disconnected.” You will just then wait for it to boot up. It might say “Configuring CM List“.

Press Settings -> Firmware Versions

Under Application Load ID, you will see your firmware version.


It looks like this. Mine is P0S3-8-12-00 means version SIP 8.12.

SCCP firmware: P003xxyyzzww: where x represents the major version, y represents the major subversion, z represents the maintenance version, and w represents the maintenance subversion.

SIP firmware: P0S3-xx-y-zz: where x represents the major version, y represents the minor version, and z represents the subversions.


There are other ways to check firmware on a Cisco IP Phone, you can check it out here.


If you have any questions or comments, feel free to write below. If you like my contents, subscribe!