| CoID | Company | Type | Status | States Served | 24X7 Phone |
|---|---|---|---|---|---|
| TUC | Daystar Communications - CANCELLED | CLEC Facility | CLEC Reseller | CLEC UNE | C | FL | 877-912-1300 |
| TUFON | Tufone, Inc. (CANCELLED) | VoIP | C | All States | 347-239-2136 |
| TULA | Salish Networks | CLEC Facility PBX/PS911/Shared Tenant VoIP Provider | A | WA | 360-716-8000 |
| TURK | Turkana LLC | VoIP Provider | A | USA - Nationwide | 415-988-2599 |
| TURN | Central Voice & Data LLC dba Turner Teleco-Alexandria | VoIP Provider | A | USA - Nationwide Louisiana | 318-442-5743 |
| TUS | Telspirion USA LLC(formerly Tiagris) - CANCELLED | CLEC Facillity | CLEC Reseller | VoIP | C | TX | 956-657-4000 |
| TUTHL | Tuthill Corporation (INACTIVE) | Facility | C | IL | 630-382-4900 |
| TVFCL | TVF Cloud Inc | VoIP Provider | A | USA - Nationwide | 407-982-7957 |
| TVH | 3 Rivers Wireless (CANCELLED) | Wireless | C | MT | 406-467-3748 |
| TVHS | The Villages Health System | PBX/PS911/Shared Tenant | A | FL | 352-751-8000 |
| TVOIP | Lumen - CenturyLink | VoIP Provider | A | USA - Nationwide | 800 357-0911 |
| TVS | One Rign Networks (Telenational Communications ) | VoIP Provider | A | AZ | CA | GA | MD | TX | 214-382-9990 |
| TVSOC | Think VoIP Services | PBX/PS911/Shared Tenant VoIP Reseller VoIP Provider | A | USA - Nationwide | 352-789-6043 x27 |
| TVSRV | TV Service Inc. | CLEC Facility | VoIP | A | KY | 606-785-3450 |
| TWBRK | Twinbrook - CANCELLED | ILEC | C | MD | 301-319-0579 |
| TWC | TelWare Corporation | VoIP Reseller | A | GA | NC | SC | VA | 800-637-3148 |
| TWCBL | Charter Fiberlink DBA Time Warner Cable (Now Charter Comm.) | Cable Digital | A | USA - Nation Wide | 844-612-9261 |
| TWCIS | Time Warner Cable Information Svcs (Cancelled - See TWCBL) | VoIP | C | nationwide | 877-777-2263 |
| TWCNC | Time Warner Cable/Raleigh | PBX/PS911/Shared Tenant | A | NC | 919-573-7190 |
| TWCOM | Lumen - CenturyLink | CLEC Facility | A | USA - Nationwide | 800 357-0911 |
| TWCSK | Twincraft Inc. | PBX/PS911/Shared Tenant | A | VT | 802-238-8661 |
| TWEST | Time Warner Telecom (Cancelled - See TWCOM) | Facility | C | WA, OR, CA, AZ, ID, NM | 800-875-9489 |
| TWG | TechWorks Group | VoIP Reseller | A | USA - Nationwide | 703-337-7777 |
| TWI | Twilio | Other - (must identify below) | non-interconnected VoIP | A | USA - Nation Wide | 855-232-9996 |
| TWIST | Twister Communications Network Inc (Cancelled) | facility | C | ALL | 800-894-7837 |
| TWNVT | Twin Valley Communications Inc | CLEC Facility | A | KS | 800-248-3631 |
| TWST | Tel West Network Services - CANCELLED | CLEC Facility | CLEC Reseller | CLEC UNE | C | TX | 800-813-3880 |
| TWT | Tidewater Telecom/Lincolnville Tel. | ILEC | A | ME | 207-563-9931 |
| TWTIN | Telewebtech | VoIP Reseller | A | USA - Nationwide | 317-439-6697 |
| TWU | Texas Womans's University | PBX/PS911/Shared Tenant | A | TX | 940-368-3438 |
| TWVLY | Twin Valley Telephone Inc | ILEC | A | KS | 800-248-3631 |
| TXACQ | TX11 Acquisition LLC dba Cellular One - CANCELLED | Wireless/Cellular/PCS | C | TX | 936-590-1568 |
| TXCOM | Advanced VoIP Solutions | VoIP Provider | A | TX | 325-439-0533 |
| TXKCO | Texarkana College - CANCELLED | PBX/PS911/Shared Tenant | C | TX | 903-798-3330 |
| TXNET | Texas Network Communication, Inc. (Cancelled) | Facility | C | TX | 877-572-1030 |
| TXUL | TXU Communications Telephone Company (Cancelled - See CCITX) | Facility | C | TX | 888-608-7822 |
| TXUTS | TXU Communications Telecom Services (Cancelled - see CCITX) | Facility | C | TX | 888-608-7822 |
| TYCHR | Tychron Corporation | VoIP Provider | A | FL | 302-842-8751 |
| TYCOE | TYCO Electronics(Cancelled) | PBX/PS911/Shared Tenant | C | PA | 717-810-2255 |
| TYQ | Telergy Central (Cancelled) | Facility | C | US | 800-889-6716 |
| TZ0 | Tierzero | VoIP Provider | A | USA - Nationwide | 213-784-1397 |
| UAL | United Airlines | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | USA - Nationwide | 847-700-5800 |
| UAZ | University of Arizona | PBX/PS911/Shared Tenant | A | AZ | 520-621-7999 |
| UBALT | University of Baltimore | PBX/PS911/Shared Tenant | A | MD | 800-773-7911 |
| UBC | The Community Agency (TCA) | Facility | A | IA | 712-930-5593 |
| UBN | UBNETWORKS (Cancelled) | Facility | C | CA | 213-489-9663 |
| UBNI | Unity Business Networks - CANCELLED | CLEC Facility | CLEC Reseller | VoIP | C | CO | 800-213-1236 |
| UBNX | Unity Business Networks - CANCELLED | CLEC Faciliy | CLEC Reseller | VoIP | C | CO | MN | OR | 800-231-1236 |
| UBTAL | Strata Networks | Co-Op/Rural | A | UT | 435-622-5007 |
| UBUFF | University at Buffalo | PBX/PS911/Shared Tenant | A | NY | 800-773-7911 |