Call Completion (3CX) - PBX Support Required?

[sexy-trousers]

Hi, I have T42G & T46G's and after reading what Call Completion should do, I'm not seeing it work at all...

I've enabled Call Completion on both the caller and the callee phone, I've called and tied up the callee phone with another call and called from a 3rd phone where I would expect to see something like "on another call - call again?".

You should then be able to select to call the person when they are off their call and your phone lets you know when they're off the call and offers to call them - but I don't see anything - does the PBX need to support this or is it a phone feature?

In any case, I'm using 3CX 12.5 and this comment implies it should work with 3CX.

Any ideas? Thanks. TJ