[Serusers] what the column "caller_UUID" and "callee_UUID" in acc table use for?

[Nilus]

HI, serusers,

Does anybody know what the column "caller_UUID" and "callee_UUID" in acc table use for?
I use cvs head version. 
Is there any document about acc and avpops module if I have call_forward function in my ser using avpops?

Regards,
Nilus
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