VoIP & Communications

Signs you need a new business phone system (and what it is costing you)

Missed calls, workarounds, no reporting, staff who cannot answer from home, a PBX out of support: the signs a phone system is holding you back, and what to do.

By Dig IT SolutionsUpdated 8 September 20265 min read

Short answer

The clearest signs you need a new business phone system are missed calls you only hear about from customers, staff using personal mobiles to work around it, no reporting on call volumes, calls that cannot be answered from home or another site, a PBX out of support, and lines that will stop working at the January 2027 PSTN switch-off.

Phone systems rarely fail outright. They decline. Calls get harder to manage, staff invent workarounds, customers repeat themselves, and nobody connects the gradual loss of enquiries to the box in the comms cupboard. By the time the problem is obvious it has been costing money for a year. Here are the signs that a phone system is holding a business back, what each one is costing, and how to respond.

Signs your customers notice

Missed calls you only hear about from customers

The first sign, and the most expensive. Lines engaged at busy times, calls ringing out because nobody is sure who should answer, voicemail boxes that fill up, nothing after 5:30. Each missed enquiry is a quote never sent, a booking never made or a client who assumes you are too busy for them. The worst part is invisibility: a legacy PBX gives no report, so the business believes it is answering most calls until it looks at the data. Hosted platforms report missed and abandoned calls by hour, and the first report is usually a shock.

Staff are working around it

Personal mobiles for business calls. WhatsApp groups to coordinate. Call notes typed into a spreadsheet because the phone does not talk to the CRM. Reception writing messages on paper. Each workaround keeps things moving today and creates a problem tomorrow: customer numbers on staff phones that leave with them, no record of what was said, no visibility for managers, and a data protection exposure nobody signed off. When people route around the system, the system has failed.

No reporting

If you cannot say how many calls came in last Monday, how long callers waited or which team is slowest to pick up, you cannot manage it. Decisions get made on anecdote: hire another person when the fix was a routing change, or assume performance is fine while customers quietly leave. A modern system produces those numbers as standard, and our guide to how VoIP improves customer experience shows what to do with them.

People cannot answer from anywhere but their desk

Hybrid working is normal. Field staff, surveyors, engineers and account managers are out of the office most of the day. If a call to the office cannot follow them, it goes to voicemail or to a personal mobile. If a snow day or a burst pipe closes the office, the phones are dead. A system that ties calls to a desk in one building is a limitation on how the business can operate, not just an inconvenience.

Signs the business notices

Growth has outrun it

The setup chosen for six people does not suit twenty. Symptoms:

Departments have formed but every call still lands on one receptionist.
Adding a user means an engineer, a line card and a fortnight.
A second site has its own phone system and you pay to call it.
Changing the out-of-hours message requires a maintenance visit.
The auto-attendant, if there is one, was recorded three restructures ago.

Businesses tend to review their phones at these triggers, and the ones that do so early avoid months of strain. VoIP for multi-site and growing businesses covers what scaling looks like when the system is designed for it.

It does not integrate with anything

A caller's record should appear when they ring. A call should be logged against the job or the matter automatically. Reception should be able to see that a colleague is in a meeting before transferring. If the phone system is an island, staff ask for details the business already holds and managers have no joined-up view of customer contact. Integration with Microsoft Teams and the CRM is standard on hosted platforms and a bolt-on, at best, on a PBX.

The PBX is out of support

Parts are hard to find, the maintainer has warned you, updates stopped years ago and a fault would mean days rather than hours to fix. An unsupported phone system is also a security risk if it is connected to the network. Insurers are beginning to ask about it.

Your lines will stop working in January 2027

If the system runs on analogue or ISDN lines, it has a hard end date. Openreach is withdrawing the PSTN on 31 January 2027, so those lines will need replacing regardless of how well the phones are working. Our PSTN switch-off guide covers what else is affected, from alarms to card terminals.

What it is costing

Sign	Visible cost	Hidden cost
Missed calls	None on the invoice	Lost enquiries, lost bookings, reputation
Workarounds	Staff time	Lost records, data protection exposure
No reporting	None	Wrong staffing decisions
Desk-bound calls	Diverts to mobiles	Missed calls out of office, dead phones in a closure
Growth pain	Engineer visits, extra lines	Delayed expansion, inconsistent service
No integration	None	Repeated questions, no customer view
Out of support	Maintenance contract	Multi-day outage risk
PSTN lines	Line rental	Forced migration on someone else's timetable

What to do about it

Recognising two or more of these signs is enough to justify a review. The process is well understood: audit the lines, numbers and devices, assess the network, choose a hosted platform, port the numbers and run in parallel before cut-over. It is set out step by step in how to switch from a landline to VoIP, and the typical costs are in how much VoIP costs in the UK. Dig IT's VoIP and business phone systems service handles the whole project on 8x8, including the network work that determines whether the new phones are any good.

What to do next

If missed calls or workarounds are a known problem, the quickest win is a fortnight of real data. Talk to an engineer about a review of how your calls are handled today and what a replacement would involve.

Frequently asked questions

How do I find out how many calls we are missing?

With a legacy PBX, you often cannot, which is itself the problem. Ask your line provider for call records, or run a two-week trial of a hosted platform on a diverted number and read the missed-call report. Businesses that do this are usually surprised. Missed calls cluster at lunchtime, first thing on Monday and just after five, exactly when enquiries are most likely to come in.

Why do missed calls matter so much for reputation?

A caller who cannot get through assumes the business is disorganised or too busy, and most of them ring the next firm rather than leaving a message. Existing customers who repeatedly hit voicemail start to doubt the relationship. The damage is quiet: fewer new enquiries convert and loyal clients drift, without anyone ever telling you the phones were the reason.

When should a growing business review its phone system?

At each step change: hiring beyond what one receptionist can handle, forming departments, opening a second site, moving office or adopting hybrid working. Each adds routing, capacity or location demands the original system was not chosen for. Reviewing at the trigger, rather than after months of workarounds, means the new system is in place before the strain shows to customers.

Is it disruptive to replace a phone system?

Not if it is planned. A hosted platform is built and tested alongside the old system, numbers are ported on an agreed date and callers notice nothing. Staff need a short briefing on transfers, queues and the mobile app. Most single-site businesses move in four to eight weeks, with most of that time waiting on porting rather than doing anything disruptive.

Is keeping the old system really cheaper?

Rarely, once the full cost is counted. Line rental for every line, maintenance on an ageing PBX, engineer visits for every change, call charges between sites and, above all, the enquiries lost to missed calls. Hosted VoIP is a per-user subscription with the features included, and analogue and ISDN lines will need replacing before January 2027 regardless.