+=item by_ip_addr => 'src' or 'dst': Select CDRs where the src_ip_addr or
+dst_ip_addr field matches title. In this case, some special logic is applied
+to allow title to indicate a range of IP addresses.
+
+=item begin, end: Start and end of date range, as unix timestamp.
+
+=item cdrtypenum: Only return CDRs with this type.
+
+=item calltypenum: Only return CDRs with this call type.
+