Lumen Is Exiting Voice. What SIP Trunking Customers Should Do Next

Lumen Technologies, the carrier that still sells to most small and mid-size businesses under the CenturyLink name, told its channel partners on July 1, 2026 that a group of products would become ineligible for new sales and renewals on August 1, 2026. The voice line-up was on that list: SIP trunking, Voice Complete, and hosted voice for Microsoft Teams and Zoom. A second notice on July 16 clarified the scope after partners pushed back on how the first email read, and roughly 90 partner-channel positions were eliminated in the same reorganization.

Lumen's own words on existing customers were brief: it "will continue to support our existing commitments," and voice services will move to "month-to-month agreements when contracts expire" instead of being renewed. No end-of-life date was published, and no migration program was announced.

Affected and not affected

This is a strategy decision, not a technical failure. In February 2026 Lumen closed the $5.75 billion sale of its consumer fiber-to-the-home business to AT&T and used the proceeds to cut roughly $4.8 billion of debt. The company now describes itself as an enterprise digital networking provider for the AI economy: long-haul fiber for hyperscalers, wavelengths, and cloud networking. It had 17 million intercity fiber miles deployed at the end of 2025 and is building toward 47 million by 2028.

Business voice does not fit that picture. It is a low-margin, high-support product that competes with hundreds of specialist SIP providers, and it depends on legacy Sonus and Broadsoft platforms that need ongoing investment. Ending new sales lets Lumen stop investing in those platforms while the existing base runs off over the next several contract cycles.

For customers the takeaway is simple. The carrier that sold you the trunk has told the market it does not want to be in this business. Even if your service is stable today, the platform behind it is now in run-off mode, and run-off platforms do not get feature work, capacity upgrades, or priority when something breaks.

• ✓Your calls keep working. Nothing is being switched off on August 1 or any announced date. Voice Complete and SIP trunks continue to run under your current contract.
• ✓There is nothing to renew into. When the term ends, the service converts to month-to-month automatically. Expect no renewal quote, no negotiated rate, and no term protection.
• ✓Month-to-month pricing is worse pricing. Across the industry, evergreen voice rates carry a premium over term rates and can be changed on 30 days' notice. Every month you stay past term you lose leverage.
• ✓You will not get a migration plan from Lumen. Lumen has not published one. Planning the move, porting the numbers, and re-registering E911 is your project or your new carrier's.
• ✓Adds and changes get harder. New trunks, extra channels and new toll-free numbers are new sales. If you open a location next year, Lumen will not be able to serve it.
• ✓Toll-free needs extra attention. If your toll-free numbers ride Lumen, confirm in writing whether they are covered, and plan a RespOrg change alongside the SIP move so inbound 800 traffic is not left on an orphaned service.

The technical part of a SIP trunk swap is short. The calendar is driven by number porting, E911 re-registration and how many sites you have. Use these planning figures:

Work backwards from your Lumen term date. A single site should have a signed replacement provider 90 days out. A multi-site or contact-center customer should be evaluating providers now if the term ends inside the next twelve months.

1. Inventory what you actually have

Export every phone number on the account, including toll-free, fax lines and numbers used only for outbound caller ID. Note which trunk group each rides, the concurrent-call limit on each trunk, and the registered E911 address per number. Most surprises in a port come from numbers nobody remembered.

2. Find your contract end date and notice terms

Lumen contracts usually require written notice before term to avoid auto-renewal into month-to-month. Get the term date and the notice window in writing from your account team. Do not send a disconnect order yet; the port is what ends service.

3. Confirm your PBX can point at another carrier

If your PBX registers to Lumen or authenticates by IP over SIP, it can do the same with any SIP provider. Check that you have admin access to the trunk settings, know which codecs you use (G.711 is universal), and whether you need TLS and SRTP. Our guides for Asterisk PJSIP, FreePBX and 3CX show what a trunk change looks like on each platform.

4. Choose the replacement provider and test before you port

Stand up the new trunk with a temporary number and make real calls: outbound to cell phones, inbound to your IVR, a fax if you still have one, and a 933 E911 test. Measure audio quality at your busiest hour. See how to trial a SIP trunk properly before moving a single production number.

5. Re-register E911 and update caller ID

Every number that can dial out needs a dispatchable address on the new carrier before it carries live traffic. Set your outbound caller ID to numbers you own on the new trunk, and enable STIR/SHAKEN attestation so your calls are not marked as spam after the move.

6. Port the numbers, toll-free last

Submit local ports in batches per site with a firm order commitment date; the new carrier coordinates with Lumen and the number simply starts arriving on the new trunk on port day. Toll-free numbers move by RespOrg transfer, which is a separate process with its own paperwork. Run both trunks in parallel until the last port completes. Full detail in our number porting guide.

7. Close out Lumen and keep the evidence

After the final port, request a written confirmation that the account is closed with a zero balance, and keep the port confirmations. Then review your new trunk for failover and redundancy and capacity headroom so the next carrier change, if there ever is one, is a configuration change and not a project.

Lumen sold trunks the way legacy carriers do: a fixed number of concurrent-call paths, a monthly fee per path, a term contract, and a change order when you needed more. The market has moved on. When you compare replacements, look for:

• ✓No per-channel fees and no hard concurrent-call caps. Capacity should follow your traffic, not a contract addendum. Bursting to 50 calls on your busiest day should just work.
• ✓Transparent per-minute pricing. You pay for usage and for the numbers you hold. If a quote has a channel line, a trunk fee and a usage line, ask why.
• ✓Geographic redundancy you can see. At least two points of presence with DNS SRV or IP-based failover, and the ability to register your PBX to both.
• ✓Carrier-grade compliance built in. STIR/SHAKEN signing on outbound, E911 with dispatchable location, Kari's Law and RAY BAUM's Act, TLS and SRTP for encryption.
• ✓Porting handled for you. A team that submits the LNP and RespOrg paperwork, chases Lumen, and gives you a firm cutover date.
• ✓A provider that wants to be in this business. Ask how long they have sold SIP trunking, whether they own their switching, and who answers the phone at 2 a.m.
• ✓Month-to-month by default. You are leaving a carrier because a term contract locked you into a product it no longer sells. Do not sign another three-year term to escape it.

We compare the larger providers head to head in our SIP trunk provider guide, and SIP trunking vs PRI covers the case where Lumen was still delivering you PRI circuits.