How to manually set a queue member status?

As following:

*CLI> show queue
CustServ has 0 calls (max unlimited) in ‘roundrobin’ strategy (0s holdtime), W:0, C:0, A:0, SL:0.0% within 0s
Members:
SIP/1001 with penalty 1 (dynamic) (Unavailable) has taken no calls yet
No Callers

FYI, my SIP/1001 is currently hotdesk on station 5001. When i sign into CustServ queue, status Unavailable due to SIP/1001 do not register on any softphone.

SIP/1001 is not defined in agent.conf, I login into the queue by DAC.

How can I manually set the SIP/1001 status from Unavailable to Available/Not in use?

Thanks in advance.