3CX with Grandstream Phones - Call transfer broken for a few months now

[charly]

Hello,
Since a few months now, the call transfer function works absolutely unreliably on my Grandstream phones with 3CX Cloud version.
When connected to a call, I used to be able to press the call transfer physical button on the phone and then press the extension I want to transfer to using the BLF and it automatically transferred the call.


Now when I do that it, I have to press for a second time another transfer button that appears on the screen. And this doesn't always work, often, the phones, call doesn't get transferred and the phone become suddenly unresponsive, and I have to unplug the phone from the power cord.

I think the problem started from a 3CX update and getting worse every update.

Product	Enterprise Annual
Version Number	16.0.493

Phones:
GXP2170 and GXP2160 ( FW 1.0.11.3).

Please help,

 

[YiannisH_3CX]

Hi @charly

To perform a blind transfer you can just press the BLF button without pressing the transfer button. If you press the transfer button before hitting the BLF then you need to hit the transfer button again to complete the transfer.
Are the phones connected to the PBX using STUN, VPN or SBC?