Here is what I get when I do "SIP SHOW INUSE"
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* User name               In use          Limit
* Peer name               In use          Limit

It doesnt show anything either a call is in progress or not.....
Secondly, I think it should show the result something like this...

Username        incoming        Limit           outgoing        Limit
omer            0               N/A             0               N/A
1106            0               N/A             0               N/A
1105            0               N/A             0               N/A
1104            0               N/A             0               N/A
1103            0               N/A             0               N/A
1102            0               N/A             0               N/A
1101            0               N/A             0               N/A
1100            0               N/A             0               N/A