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.
- The third character which is “S” stands for Session Initiation Protocol (SIP). It could be “0” for Skinny Call Control Protocol (SCCP) or “M” for Media Gateway Control Protocol (MGCP).
- “8” represents the major version.
- “12” represents the minor version.
- “00” represents the subversion.
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.
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