I found that in:
kamctl db show presentity
Is the presence information of the users, but how can I errase such entry? of a user?
And how can I define only one entry in that database by user? I use this code, when I receive a publish but this adds a new entry every time.
if(is_method("PUBLISH"))
{
if($hdr(Sender)!= NULL)
handle_publish("$hdr(Sender)");
else
handle_publish();
t_release();
}