[Serusers] Question abount avpops's avp_db_load()

Dear ALL: I have defined these lines at my ser.cfg. modparam("avpops", "avp_url", "mysql://ser:heslo@localhost/ser") modparam("avpops", "avp_table", "usr_preferences") modparam("avpops", "uuid_column", "uuid") modparam("avpops", "username_column", "username") modparam("avpops", "domain_column", "domain") modparam("avpops", "attribute_column", "attribute") modparam("avpops", "value_column", "value") modparam("avpops", "type_column", "type") modparam("avpops", "avp_aliases", "voicemail=i:500;calltype=i:700;fwd_no_answer_type=i:701;fwd_busy_type=i:702") Q1: But I don't know what it mean about 700 or 701. Is it a numeric ID of one UA? And I have refered to http://www.voice-system.ro/docs/avpops And find many examples in it. But I still can't understand what it mean about avp_db_load(). my avp table is named as "usr_preferences" and it is empty before I use avpops modules. Q2: Is it should have some initilized records in it? Otherwise, what will be loaded with avp_db_load()? For this web page said: avp_db_load("$ruri/domain","i:/domain_preferences"); - loads all AVPs with ID from 'domain_preferences' table for domain from RURI Q3: Is "$ruri" the caller user's URI? and the "domain" is the same? Is "domain_preferences" table name? Is it equal to my "usr_preferences"? Or it is just a virtual table in memory? Thank you for your answer my stupid questions. Charles