FreePBX Integration
The examples shown on this site are for an Asterisk install that uses the default configuration files. If you are using FreePBX (open_in_browser www.freepbx.org) to provision Cisco phones then you will need to perform additional steps to apply the device specific configuration options.Listed below are external guides created by other people that may be useful. Note: I do not use FreePBX and thus cannot attest to the accuracy of the information provided there.
open_in_browser https://sangomakb.atlassian.net/wiki/spaces/FP/pages/11862323 — The FreePBX wiki has a slightly outdated guide on how to patch Asterisk 11 and also has some examples of the additional configuration needed.
open_in_browser https://christai.com/index.php — This user has written guides on how to install the patch for Asterisk 20 and FreePBX 17 as well as a basic configuration guide.