Caller ID not correct when performing an attended transfer

[TimG]

Hi,

We have a system in place using 3CX and a number of Yealink handsets including T26P, T32G, T38G and T20p. All are exhibiting the same behaviour.

If you perform a blind transfer the caller ID is passed to the receiving phone correctly. If you perform an attended transfer the caller ID of the intermediate phone is displayed on the receiving phone, even after the intermediate phone hangs up.

I have tested 3CX with other makes including Grandstream and Snom and they both work correctly passing the ID on both blind and attended transfers. In 3CX there is no way to transfer via the PBX itself and as such there is no work-around to solve this issue.

Having looked around and goggled this at some length there are a number of people that have noticed this issue but no resolution as been posted. I wondered if anyone on here had come up with a solution or spoken to Yealink about this directly?