Onvoy, LLC
About Onvoy LLC
Onvoy, LLC is one of the largest wholesale telecommunications carriers and communications enablement companies in the United States, providing network-based voice, messaging, and 911/emergency services infrastructure primarily on a business-to-business basis to carriers, cable operators, wireless providers, VoIP and OTT communications companies, and integrators. Founded in 1988 in Minneapolis, Minnesota, Onvoy spent its first three decades building a robust nationwide switching and transport infrastructure before being acquired by private equity firm GTCR in 2016, which used Onvoy as a platform for significant M&A activity — including the acquisitions of Broadvox and Neutral Tandem — to create one of the most extensive wholesale voice networks in the country. In 2021, Swedish cloud communications giant Sinch AB completed the acquisition of Onvoy Holdings, Inc. from GTCR in a transaction approved by regulators across multiple states, making Onvoy a wholly owned subsidiary of Sinch. Today, Onvoy operates under the Sinch umbrella as a leading domestic wholesale voice and messaging carrier. The company’s registered headquarters is at 10300 6th Avenue North in Plymouth, Minnesota, with an additional principal operating office at One North Wacker Drive, Suite 2500 in Chicago, Illinois, where Sinch’s U.S. operations team is primarily based.
Quick Information
Industry
Wholesale Telecommunications — Voice, Messaging & 911 Services
Founded
1988, Minneapolis, Minnesota
Number of Employees
Approximately 201–500 employees operating as part of the global Sinch organization
Corporate Office Hours
Monday to Friday, 8:00 AM – 5:00 PM Central Time for corporate operations. Emergency 911 and network operations support is available 24 hours a day, 7 days a week.
iq-taxdepartment@sinch.com — tax and regulatory correspondence
General inquiries: contactform available at onvoy.com
Website
www.onvoy.com
Parent Company Website
www.sinch.com
Contact Page
onvoy.com/contact
Products & Services
Onvoy, LLC provides a carrier-grade portfolio of wholesale voice, messaging, and emergency services infrastructure exclusively to business, carrier, and enterprise customers — not directly to end consumers. Their full range of products and services includes:
- VoIP/SIP Trunking — wholesale Session Initiation Protocol (SIP) trunking services for enterprise businesses, UCaaS providers, and communications service providers
- Local Voice Termination — nationwide wholesale voice termination across a proprietary switching network with interconnections to every major U.S. carrier
- Toll-Free Services — wholesale toll-free origination and termination services for call centers, enterprises, and service providers
- SMS & MMS Messaging — wholesale A2P (Application-to-Person) and P2P (Person-to-Person) SMS and MMS messaging services for platforms, apps, and enterprise senders
- 911 / Emergency Call Routing — mission-critical 911 call routing and emergency services enablement for VoIP providers, wireless carriers, and nomadic service providers; Onvoy Spectrum LLC is a registered CLEC Facility VoIP provider with direct PSAP connectivity
- Origination Services — local number origination and local number portability (LNP) services nationwide
- Phone Number Management — DID (Direct Inward Dialing) number provisioning and management at scale for enterprise and carrier customers
- Tandem Switching — transit switching services for carriers and service providers through Onvoy’s nationwide tandem network (formerly Neutral Tandem)
- Network Access Services — CLEC and IXC access and transit services across Onvoy’s licensed operating territories
- Regulatory & Compliance Support — multi-state tariff and regulatory compliance infrastructure for telecommunications carriers and CLECs
Corporate Phone Numbers
Plymouth, Minnesota Headquarters
(763) 230-2036 — primary Onvoy LLC corporate headquarters phone number at 10300 6th Avenue North, Plymouth, Minnesota.
Chicago Operations Office
(312) 384-8000 — Onvoy / Sinch U.S. operations office at One North Wacker Drive, Suite 2500, Chicago, Illinois. This line serves as the principal contact number for Onvoy’s regulatory, tax, legal, and wholesale operations teams.
Emergency 911 / PSAP Support (24/7)
1-855-404-4768 — dedicated 24/7 emergency support line for Onvoy Spectrum LLC’s 911 PSAP (Public Safety Answering Point) operations team. Managed by the Manager 911 PSAP Team at Inteliquent/Onvoy. Available 24 hours a day, 7 days a week.
Sinch U.S. Parent Company
(312) 384-8000 — also the primary Sinch U.S. corporate contact line for all escalated business inquiries related to Onvoy.
How to Reach a Real Person at Onvoy LLC
Because Onvoy, LLC is a wholesale B2B telecommunications carrier that serves only business, carrier, and enterprise customers — not individual consumers — it does not operate a public-facing toll-free consumer customer service line. Direct customer support is provided exclusively through established business account relationships and dedicated account management contacts assigned to each carrier or enterprise customer. The primary way to reach Onvoy’s corporate team is to call the Plymouth, Minnesota headquarters at (763) 230-2036 or the Chicago operations office at (312) 384-8000, available Monday through Friday during regular business hours.
For wholesale clients and carrier partners with active Onvoy service agreements, account-specific support should be directed to your designated Onvoy account manager or through Onvoy’s business support portal at onvoy.com. For 911 and emergency services network operations issues, the 24/7 dedicated line at 1-855-404-4768 is the appropriate contact. For general inquiries about Onvoy services or to initiate a new wholesale business relationship, use the contact form at onvoy.com. If you are an individual consumer who has encountered a phone number or communication routed through Onvoy’s network, be aware that Onvoy itself is the network infrastructure provider — the actual service provider you should contact is the business or carrier that provisioned the specific number or service.
Onvoy LLC Headquarters & Corporate Office Address
Onvoy, LLC maintains its registered corporate headquarters at 10300 6th Avenue North in Plymouth, Minnesota — a suburban community in Hennepin County just west of Minneapolis. The Plymouth address has been Onvoy’s registered headquarters since the company’s Minnesota origins and continues to serve as the entity’s principal registered address across most state regulatory filings. The company’s day-to-day operations and Sinch U.S. executive functions are primarily conducted from One North Wacker Drive, Suite 2500 in Chicago’s West Loop financial district — consistent with Sinch’s broader U.S. organizational structure following the 2021 acquisition.
Onvoy, LLC — Registered Corporate Headquarters
10300 6th Avenue North
Plymouth, Minnesota 55441
United States
Onvoy, LLC — Principal Operating Office (Chicago)
One North Wacker Drive, Suite 2500
Chicago, Illinois 60606
United States
Onvoy Spectrum LLC — Emergency Services Office (Chicago)
550 West Adams Street, 9th Floor
Chicago, Illinois 60661
United States
Sinch AB — Global Parent Company Headquarters
Lindhagensgatan 74
112 18 Stockholm, Sweden
For all formal written regulatory correspondence, legal documents, and business inquiries, use the Chicago principal operating address at One North Wacker Drive, Suite 2500. For state regulatory filings, use the Plymouth, Minnesota registered headquarters address.
How to File a Complaint Against Onvoy LLC
Step 1 — Contact Your Carrier or Service Provider First
Because Onvoy operates exclusively as a wholesale B2B infrastructure provider, if you are an individual consumer experiencing a problem — such as receiving unwanted calls from numbers on Onvoy’s network, or a service issue with a number routed through Onvoy — your complaint should first be directed to the actual service provider or business that provisioned the number, not to Onvoy directly. Most consumer-facing telecom issues attributed to Onvoy’s network are the responsibility of the downstream service provider who purchased wholesale capacity from Onvoy.
Step 2 — Contact Onvoy’s Corporate Office
If your complaint is a legitimate B2B, carrier, or business-level issue with Onvoy directly, call the Plymouth, Minnesota headquarters at (763) 230-2036 or the Chicago operations office at (312) 384-8000. Alternatively, submit a formal written complaint via the contact form at onvoy.com. Include your company name, account details, and a clear description of the service or billing issue.
Step 3 — File a Complaint With the FCC
For complaints involving unwanted robocalls, spam calls, or unlawful telemarketing routed through Onvoy’s network, file a formal complaint with the Federal Communications Commission at consumercomplaints.fcc.gov or call 1-888-225-5322. The FCC oversees compliance with the TCPA (Telephone Consumer Protection Act) and the Do Not Call Registry. The FCC can investigate carriers that knowingly transmit illegal robocall traffic.
Step 4 — File a Complaint With Your State Public Utilities Commission
Each state has a Public Utilities Commission or Public Service Commission that regulates telecom carriers. Contact your state PUC with a formal written complaint if you believe Onvoy or a carrier using Onvoy’s network has violated state telecommunications regulations. State PUCs have regulatory authority over CLEC operations and can open formal investigations.
Step 5 — Contact the FTC for Robocall Complaints
If your complaint involves unwanted robocalls or illegal telemarketing activity routed through Onvoy’s network, file a complaint with the Federal Trade Commission at ftc.gov/complaint or by calling 1-877-FTC-HELP (1-877-382-4357). The FTC investigates illegal telemarketing and robocall operations and can pursue enforcement action against carriers that enable such traffic.
