Allowing Calling user to Transfer Call in FREEPBX

Even though you have allowed Call Transfer, Calling user unable to Transfer the Call with Free PBX and Grandstream phones.

There is way to enable that facility as well.

If you want to transfer calls you have made then in the outbound dial rules on FreePBX general settings check that there is a "T".

Follow the Screen shot for configure Calling user transfer option.

Then Save the changes and Submit it, then enjoyed VOIP with FreePBX.