"The best business telephones in the world."

Hi,

I've been trying for hours to setup multiple handsets on one extension on an M300.

But it simply does not work.

First handset is recognized and working.

But every time I try to add a second handset on the same extension, it is listed as activated but the handset will not register.

I tried with the handset IPEI, I tried with default FFFFFFFFFF too, nothing seems to work. The handset tries to register but nothing happens.

Firmware version is 0.355 Branch:0022.

Is there a solution ?

Thanks for your help.