No attended transfer with BLF key after firmware update

[Werner]

Hi,
we use T28p phones at 3CX V11

After having updated the T28p Firmware from 2.61.0.70 to 2.61.0.148 attended transfer does no more work as before.

With 2.61.0.70 we could dial the transfer destination by pressing the BLF key for that Destination, eg with:
- TRAN
- press BLF key
- speak with collegue
- transfer call to collegue with TRAN

After updating to 2.61.0.148 pressing the BLF key results in a blind transfer; only if we dial the destination # by hand on the decimal block we can make a attended transfer.

My collegues don't like this new behaviour because almost always they need an attended transfer.

How can I configure the T28p wit FW 2.61.0.148 to do an attended transfer when dialing the destination with BLF key ?

Any hint/help is highly appreciated; thanks in advance

Werner