VoIP Costs
VoIP Budget for a 25-User Business: Worked Example
At 25 users a phone system gains departments, queues and politics: sales wants its calls recorded, support wants a queue with real reporting, and the conference rooms need phones that actually work. The budget below — the reference example used in this site's hosted-vs-on-premise comparison — uses the standard illustrative rates ($25 seat, $1 DID, $1.25 e911, 18% taxes/fees) so all four size budgets compare cleanly.
Two things distinguish a sound 25-user budget: it prices the shared spaces (conference rooms, warehouse, lobby) deliberately instead of as accidental full seats, and it starts a small hardware refresh reserve so year four's dead phones are a plan, not a crisis.
Monthly budget (illustrative rates)
| Line item | Math | Monthly |
|---|---|---|
| Seats (mid tier) | 25 × $25 | $625.00 |
| DID numbers (25 user + main + fax) | 27 × $1 | $27.00 |
| E911 service | 27 × $1.25 | $33.75 |
| Taxes & fees (planning factor) | 18% of $685.75 | $123.44 |
| Total monthly | ≈ $809 | |
| Per user, all-in | $809 ÷ 25 | ≈ $32 |
One-time budget and the refresh reserve
Phones: 25 desk phones at the $110 sample price ($2,750), one conference phone ($400), and two DECT cordless units for roaming staff ($300) — $3,450. Network: two PoE switches or one larger unit with headroom ($800). Installation, call-flow design and training: $900 outsourced, often partially included. Total one-time ≈ $5,150. Then the line nobody writes down: a refresh reserve of about $60/month (roughly 1.5% of the monthly bill, or ~2% of hardware value monthly) so that phones, headsets and a switch can be replaced on a rolling cycle instead of all at once in a bad month. At 25 users you also cross the threshold where someone owns the system part-time — budget 2–3 admin hours a month (see the per-user guide) even though no invoice shows it.
Decisions specific to 25 users
- Price shared-space phones on common-area licenses; at 25 users there are usually 4–8 of them and the saving is material.
- Verify the seat tier includes the queues, recording and reporting your departments actually need — tier gates bite hardest at this size.
- Design call flows by department (queues, overflow, after-hours) before go-live; retrofitting flows on a live system is where projects stall.
- Start the hardware refresh reserve with the first invoice and keep 2 spare desk phones and headsets on the shelf.
- Assign a named system owner for moves/adds/changes and monthly 15-minute bill review (fee load drifts with headcount churn).
Frequently asked questions
- Is 25 users big enough to negotiate pricing?
- Yes — 25 seats with a 24–36 month term is where published list prices become opening positions. Negotiate the seat rate, the provider recovery fees, and included onboarding as one package, and get the renewal cap in writing.
- Hosted or on-premise at 25 users?
- Our five-year comparison (linked below) shows on-premise winning on raw cash from about year three at this size, with hosted winning on resilience and zero maintenance. The deciding factor is whether you have in-house skills to run a PBX safely.
- How many trunk channels would 25 users need on SIP trunks?
- Typically 8–12 for an office profile — sized from busy-hour Erlangs, not headcount. The channel sizing guide shows the math with a 30-user example.
Sources and further reading
Related guides
- Hosted vs On-Premise: Total Cost
- VoIP Budget: 50 Users
- SIP Trunk Cost Per Channel
- VoIP Cost Calculator — run your own numbers