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PBX Total Cost of Ownership: A Method for Comparing Quotes Fairly
Phone system proposals are usually compared on the headline number at the bottom of page one. That number rarely reflects what the system will cost over its life. A lower capital price can become the more expensive option once per-user licensing, mandatory maintenance, expansion licensing, and the labour to keep legacy hardware alive are counted. A comparison method matters more than the specific numbers, because the method can be reused for every future proposal.
The Cost Categories to Capture
| Category | Typical items | Often missed? |
|---|---|---|
| Initial hardware | Platform, licenses, gateways, handsets, installation | Accessories and cabling |
| Recurring platform licensing | Per-user or per-feature fees, version upgrades | Yes, frequently |
| Maintenance and support | Annual support contract, response times | Support tiers above standard |
| Telephony | Trunk rental, call charges, international rates | Price increases at renewal |
| Network readiness | Voice-ready LAN, PoE switches, VLANs, UPS | Yes, a major one |
| Endpoint refresh | Handset replacement cycle | Yes |
| Expansion | Additional users, ports, sites, features | Yes, priced per user at order |
| Exit cost | Decommissioning, port numbers, migration effort | Yes, always |
| Internal labour | Admin time for moves, adds, changes | Rarely counted at all |
Normalising the Comparison
- Use the same horizon for every proposal — Five years is standard; three years flatters capital-heavy options
- State the user growth assumption — Apply the same growth percentage to every proposal
- Include the same optional features — Comparisons often differ because feature scope differs
- Separate recurring from one-off costs — Then total each over the horizon
- Include maintenance at the required response tier — Not the cheapest tier
- Add the exit cost even though it occurs in year six — It is a real liability
The Costs That Quietly Exceed the Quote
Three categories repeatedly appear in total cost calculations and rarely in proposals. The first is network readiness: an estate that was never voice-ready needs switched ports with Power over Ethernet, VLAN segmentation, and tested uplink capacity, and that work frequently exceeds the cost of the phone system itself. The second is endpoint refresh, since handsets have a service life and replacement is inevitable even if not in year one. The third is expansion pricing, because most platforms price additional users and features higher at the time they are added.
Discounting and Payment Structure
Payment structure changes the comparison more than price does. A three-year rental with hardware at the end is very different from outright purchase with a maintenance contract. Compare proposals on total cash out over the same period, and note who owns the hardware and what the exit terms are. A proposal that appears cheaper may require the estate to buy hardware again in year four.
Presenting the Comparison Internally
A one-page comparison with five-year totals, the recurring share separated from the one-off share, and the three hidden-cost categories shown explicitly, is more persuasive than any single number. It also protects the decision later, because when a cost appears that was not anticipated, there is a record of what was modelled.
Redstone Approach
Redstone provides total cost comparison material for business phone system decisions, including licensing structure, maintenance options, endpoint lifecycle, and network readiness considerations, so that proposals can be compared on the same basis. Redstone can also supply a costed expansion path, so the price of year three and year four users is known before they exist.
Redstone offers a five-year total cost comparison across deployment models, including on-premises, cloud, and hybrid configurations, with licensing and endpoint costs itemised.
Redstone Systems, Inc. founded in Delaware, USA in December 2002, has been the ODM vendor for many well-known communications companies, serving the Southeast Asian market. In 2020, Redstone Systems will begin to return to the North America market with its self-developed brand.
Redstone has a complete product line of intelligent voice gateways, providing IP-PBXs, analog VoIP gateways (FXS/FXO), digital VoIP gateways (E1/T1), border appliances, and session boundary controllers (SBCs).
With advanced technology in digital signal processor (DSP), speech coding and speech processing, as well as efficient operational tools such as cloud remote management, auto provisioning, Redstone gateways are widely used in markets of enterprise communications, cloud communications, call centers, operators’ IMS/SIP trunks, bringing users friendly, efficient and reliable communication experience.
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