@bigbear said in Attended Call Transfer Yealink T42S and FreePBX:

Per FreePBX developer I believe Yealink hasn't been quick to follow up on compatibility testing with FreePBX releases. This was a response I got on the FreePBX forums.

Have had different transfer issues myself when using FreePBX where you would transfer and the call would ring back (with no one there) wherever the extension transferred to was not picking up the call, instead of going to voicemail.

That specific issue is PJSIP only and has a known solution. I posted it. You have to use a config file to set it though. It does not have a setting in the GUI.