On more complicated PBXs with digital trunks, it is common to manipulate the CallerID information being sent with outbound calls. FreePBX developers concluded this was useful information to display to the caller making the outbound calls.
FreePBX default settings tell outbound-calling phones to display a modified CallerID Name (CNAM) when making outbound calls. They will display:
CID:<number>
where <number> is the outbound CallerID Number (CNUM) that the PBX is sending to the callee.
Most phones display the dialed number in their call histories making it simple to redial a called number.
Yealink phones will save the modified CNAM in their call history…the same call history that is used for redial functions. A Yealink user that goes to redial a previous outbound call will see their own number in the call history, in the format CID:<number>.
FreePBX → Settings → Advanced Settings → Dialplan and Operational (about half way down the page)
Set Display CallerID on Calling Phone to False.