Demo · Sizing and the upgradeAsk both while you are still on the demo. You are recommending they start with what is included, and letting them know the rest exists and can be priced.
How to position it
Count the business, not the handsets. Back office, field staff, managers and owners get the same seat with no extension. Ask who ends up owning follow-ups, not who has a phone on their desk.
Each seat includes 300 minutes a month, pooled across the whole account. Ask roughly how long people are on the phone. A heavy user is fine, the pool absorbs it. Check your own rate card before quoting anything above the pool.
Never let someone believe an upgrade is included. Naming the line during the demo costs you nothing. Discovering it in month three costs you the account.