TL;DRA dated segment of a billing schedule with its own products and prices.
Contracts rarely bill the same amount for their whole term. A ramp steps the price up each year; a pilot bills differently from the full deployment; a renewal clause changes the rate when the next term arrives. Each of those is a phase.
A phase has a start and an end date and its own set of product lines. Phases must not overlap on a calendar day; a gap between them is allowed and simply does not bill.
Sonic's contract reader proposes the phases from the document, including renewal phases when the next term is already due, and the operator confirms them before the schedule activates.
Where it happens in Sonic
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See it on your contracts
A walkthrough on the agreements and files you actually bill from — not a slide deck.