Here is the dirty secret of most telecom bills. Ten to twenty percent of the spend is for stuff nobody can find.
A T1 at a branch that closed in 2019. A second DSL line someone added as backup in 2014. A PRI left running after the move to SIP. Carriers do not turn these off on their own. The meter runs until you send a disconnect order and get a confirmation number back. That is the problem telecom expense management is built to solve.
What TEM software actually does
Strip away the sales deck and TEM does three things.
It builds an inventory. Every circuit ID mapped to an address and a cost center. It validates invoices, comparing each monthly charge to the rate you signed for. And it manages disputes, filing credits and tracking them to the end.
The big vendors are Tangoe, Calero, Sakon, and Brightfin. Pricing usually runs 1 to 3 percent of the spend they manage, or a per invoice fee of about $3 to $8. Most have a monthly minimum between $1,000 and $3,000. That minimum is the part the vendor glosses over. It is also the part that decides whether you should buy at all.
The break-even math
The formula is simple. Expected savings, minus the platform fee, minus your own time.
Savings usually land around 15 percent of spend in year one, then drop to 3 to 5 percent after that. The first year is the cleanup. The rest is maintenance.
Run two cases. A company spending $8,000 a month across 6 locations might clear $1,200 a month in year one. After that, maybe $300. Against a $2,000 minimum fee, that account loses money by month 14.
Now a company spending $90,000 a month across 60 locations with 40 invoices. Year one savings around $13,000 a month against a $2,500 fee. That one keeps winning.
Rule of thumb: below roughly $25,000 a month or 15 invoices, do it by hand.
The by-hand inventory
This is the single highest return thing in TEM, and it costs nothing. One spreadsheet. Five columns.
Circuit ID (the carrier's identifier, like a BAN or a circuit number such as 12.HCGS.123456). Service address. Service type and speed. Monthly recurring charge. Contract end date.
Pull these from the invoice detail pages, not the summary page. The summary hides the circuits. The detail shows them.
Then confirm each circuit actually terminates at live equipment. Walk the closet or call the site. For a 10-location business, plan on 3 to 6 hours. That is one afternoon.
Reading the bill against the contract
Once the sheet is built, compare three things.
First, the MRC on the bill versus the rate in your service order. These drift apart over time. Second, the fee lines. The Federal Universal Service Fund pass-through is regulated and real. "Carrier Cost Recovery," "Administrative Expense Fee," and "Property Tax Allotment" are carrier revenue dressed up as fees.
Third, the term. And watch the clock. Most master service agreements cap billing disputes at 60 or 90 days from the invoice date. Errors older than that are usually gone. Look for the clause named "Billing Disputes" or "Disputed Charges."
The disconnect call and the dispute letter
For a dead circuit, call the carrier's business disconnect line. Not your sales rep. Request disconnection by circuit ID. Get the disconnect order number in writing. Then calendar a check of the next two invoices to confirm the charge actually stops.
For overbilling, send written notice to the dispute address in your MSA, inside the window. Cite the circuit ID, the invoice date, the contracted rate, the billed rate, and the amount in dispute. Carriers have to respond in writing, usually within 30 days.
One thing about termination fees. They only apply to circuits still in term. A circuit past its end date is month to month. You can kill it with 30 days' notice and no penalty.
When to buy, and what to demand
If you are above the threshold, buy carefully. Make the vendor deliver a validated inventory within 90 days. Tie part of their fee to the credits they recover. Insist on export rights for your inventory data when the contract ends. And ask straight out whether mobile is included or priced on the side. A 20-location office network and a 2,000-handset sales force are not the same job.
Avoid three-year TEM deals. The savings are front loaded. The value drops hard after year one.
So stop treating the bill as the unit. Treat the circuit as the unit. Pull the last invoice from every carrier, build the five-column sheet, and disconnect everything with no live endpoint. Do that first. If your spend is still above $25,000 a month across 15 or more invoices, then go get TEM quotes. And negotiate on inventory delivery and data ownership, not feature lists.