T26P DSS keys to show used line

[hwtsai]

Sorry maybe i didn't make myself clear. In my office, I have 7 phones line with one line as hunting number and the other 6 as hunting lines. Say our 7 lines from our telephone provider are as follow : 123401 (set as hunting no), 123402, 123403, 123404, 123405, 123406 and 123407.

Our situation now is we never now how many phones lines are left available to make call outbound. T26P of mine can only tell me which internal extension is busy like 1001,1002 etc.

So question is, is it possible to set these 10 DSS keys to represent available outbound phone lines, instead of internal extension? So I would know for example 123405, 123407 is busy and other are available.

I am using Grandstream GXE 5024 as PBX Server.