[Serusers] log ( history of action for one user)

[Legos Engineering]

HI.

I wonder, if there is some log (like messages or another) which permit
to know the history of one user ( his last calls, when he was
called ...). 

I want to know that in order to add, an history of each user in the
webcare.

Therefore, if someone can say me, if this log exist and where it is.

Thank you.