call forwarding on busy line

[hilkiah]

Hi,

I am trying to configure my T26 to send the the second call to another line (e.g. line 2) if the first line is busy (e.g. line 1). ON my grandstream devices, this happens automatically. Instead what happens on my T26 is that the current line blinks, instead of the second line. Pls advise.

Thanks.