Why queue show in 13.12.2 showing both (in call) (Not in use)?

My peers is still receiving calls when peers is in USE when ringinuse=yes and no both cases
below are the logs by ‘queue show’ command

SIP/10001@TRUNK (SIP/10001 from SIP/10001) (ringinuse enabled) (realtime) (in call) (Not in use) has taken 3 calls (last was 25 secs ago)

My guess would be that the in call status is maintained directly by the queue application and the in use one is the device state from the channel driver.

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