Consolidated Service Invoice/Statement is a multipurpose transaction set used to bill for ongoing services, particularly in telecommunications and utilities. Service providers send the 811 to customers or billing intermediaries after service has been delivered. The transaction opens with the BIG (Beginning Segment for Invoice) segment, which contains invoice number, date, and amount. The HL (Hierarchical Level) segment organizes line items into a structured hierarchy, allowing the invoice to represent both simple and complex billing scenarios. Supporting details about charges, taxes, and service characteristics flow through segments like IT1 (Baseline Item Data), which captures individual billable items with quantity, unit price, and extended amounts.

Consider a scenario where Broadband Communications Inc. provides bundled internet and phone services to Acme Manufacturing. Monthly, Broadband Communications sends an 811 to Acme showing three hierarchical service groupings: internet connectivity charges with measured bandwidth usage, long-distance calling with itemized call details in the TCD (Itemized Call Detail) loop, and equipment rental fees. Each service type includes applicable taxes captured in the TXI (Tax Information) segments. The invoice concludes with a TDS (Total Monetary Value Summary) segment showing the consolidated amount due, along with optional summary-level allowances or adjustments in the trailing ITA loop. This structure lets Acme see the complete picture of services rendered while Broadband Communications maintains a single consolidated billing document.