Telecom expense management, done as an advisory engagement

Telecom expense management (TEM) is the practice of auditing, correcting, and optimizing what a business pays for voice, data, internet, and wireless services. Stackstone delivers TEM as an independent advisory engagement, not a software platform: we audit your invoices, benchmark your contracts, and negotiate with carriers, typically recovering 20–30% of telecom spend.

What does telecom expense management include?

Most businesses treat telecom as a fixed cost. It isn't. Carrier invoices are long, coded, and wrong often enough that reading them properly is a discipline of its own. A full TEM engagement covers six areas:

• Invoice and billing-error audit. A line-by-line review of carrier invoices against contracted rates. Charges billed above contract get disputed, and credits get recovered.
• Circuit and service inventory. A validated list of every circuit, line, and service you pay for, matched against locations that still exist and equipment still in use.
• Contract benchmarking. Your rates compared against what the market currently pays for equivalent service, so you know your leverage before any renewal conversation.
• Wireless and mobility optimization. Pooled plans, zero-use lines, and device counts reconciled against actual headcount.
• POTS line cleanup. Legacy copper lines, frequently still billed for alarms, fax machines, and elevators that were replaced years ago, identified and cancelled or migrated. Our guide to POTS line replacement covers the 2029 copper deadlines.
• Carrier negotiation. Renewals and new agreements negotiated with benchmark data, across providers, on your side of the table.

If you want the wider picture first, a free technology spend assessment reviews telecom alongside software, cloud, and vendor contracts in a single pass.

Do you need a TEM platform or a TEM consultant?

TEM software platforms, Tangoe, Calero, and Brightfin are the names you'll hear most, are built for enterprises: thousands of invoices a month, a dedicated telecom or IT finance team to run the workflow, and budget for license and implementation fees. If that describes your company, a platform is a reasonable answer. For most small and mid-sized businesses, it isn't. Here is the honest comparison:

The math worth running before buying a platform: license fee plus the internal hours to operate it, against what the tool actually recovers. For companies without staff assigned to telecom, that math usually favors an advisory engagement, no license, no added headcount, and usually no direct cost to you, advisors are typically compensated through standard supplier commissions, disclosed per engagement.

Where do telecom billing errors and waste actually hide?

The waste rarely announces itself. It sits in line items nobody reads:

• Services billed at rates above what the contract says
• Promotional pricing that quietly expired and reverted to list rates
• Circuits still billed to locations you closed or moved out of
• POTS lines serving fax machines and alarm panels that were decommissioned years ago
• Wireless lines with zero usage still counted in the pool
• Features and add-ons nobody ordered and nobody uses
• Contracts that auto-renewed at whatever rate the carrier chose

None of this shows up in a monthly P&L review. The invoice total drifts a little each month, and the line items go unread. That is why telecom is the richest category we audit: in our engagements telecom typically yields 20–30% savings, against 15–25% for software and SaaS. For the category-by-category view, see how to cut SaaS, telecom, and vendor costs.

How does a telecom audit work?

The process is designed to take almost none of your time and to disrupt nothing:

• Discovery call. Twenty minutes on where your telecom spend sits today, locations, carriers, and known pain points.
• You share invoices and contracts. Recent carrier invoices and agreements. That is the under-30-minutes part; the analysis is our job.
• Audit and inventory. We reconcile every billed service against contract rates and against what actually exists at each location.
• Findings, in dollars. A prioritized list of errors, unused services, and above-market rates, each with a projected recovery or saving.
• Execution. Disputes filed, dead services cancelled, contracts renegotiated. You approve each step; nothing changes without your sign-off.

You keep your existing carriers unless switching is clearly the better outcome, most telecom savings come from correcting what you already have. Timing matters too: the 60–90 days before a renewal is when you hold leverage, which is why it pays to know when to review your technology contracts. If you want to run a first pass yourself, our guide to how to audit your telecom bill walks through it step by step.

How is ongoing TEM different from a one-time telecom audit?

A telecom audit is the diagnostic: it finds the billing errors, dead circuits, and above-market rates that exist today, and recovers them. Telecom expense management is the discipline of keeping those savings. Rates that were corrected can creep again. New locations add circuits. Contracts renew on the carrier's calendar, not yours. Ongoing TEM means the inventory stays current, every renewal gets benchmarked before it locks, and new invoices get checked against the rates that were negotiated, so the same waste doesn't rebuild quietly over the next two years. Most engagements start with the audit, because that is where the recoverable dollars are, and continue as renewal-window management once the baseline is clean.

What about wireless and mobility spend?

Wireless drifts faster than wireline. Employees leave and their lines stay active. Plans get sized for a headcount that no longer exists. Devices get upgraded onto pricier tiers by default. A wireless expense review reconciles every line against current staff, retires zero-use lines, right-sizes pooled data, and consolidates the account under terms negotiated with actual usage data in hand. Because mobility is usually spread across departments and expense reports, it is often the category nobody owns, which is exactly why it leaks.

What does a TEM engagement cost, and how is Stackstone paid?

The assessment is free. For optimization work, we're typically compensated through standard supplier commissions on the contracts we help you source and manage, so there is usually no direct cost to you. We never charge hourly or retainer fees; if an engagement ever includes a fee at all, it's only a share of savings actually realized, agreed in writing up front. We are independent: we don't sell telecom, and we work across the provider market rather than for any single carrier. Because providers may compensate us, we disclose how we're paid on every engagement so you can weigh the advice accordingly. If you're comparing advisors, here is how an independent advisor differs from a reseller, and you can see how engagements have played out in our case studies.

By Shane Stewart, Founder of Stackstone Advisory, independent technology spend advisor.
Last updated: July 2026.

• What is a technology spend assessment?
• When to review your technology contracts