| CoID | Company | Type | Status | States Served | 24X7 Phone |
|---|---|---|---|---|---|
| UCA | United Communications Association Inc. | CLEC Facility | A | KS | 620-855-9551 |
| UCAYD | Nevada Bell/Eschelon Telecom of NV (Cancelled) | UNE-Comp | C | NV | 800-275-0014 |
| UCB | UCB Inc - CANCELLED | PBX/PS911/Shared Tenant VoIP Provider | C | GA | 770-970-8770 |
| UCC | Union County College - CANCELLED | PBX | C | NJ | 908-709-0268 |
| UCDVN | Pacific Bell/Advanced TelCom Group (Cancelled) | UNE-Comp | C | CA, NV | 800-275-0014 |
| UCENC | Pacific Bell/Ernest Communications (Cancelled) | UNE-Comp | C | CA | 800-275-0014 |
| UCI | University of California Irvine - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) Database Mgt System Provider | C | CA | 949-824-5222 |
| UCIME | Unity College | PBX/PS911/Shared Tenant | A | USA - Nation Wide | 207-509-7232 |
| UCINC | Universal Connectivity | VoIP Reseller VoIP Provider | A | AZ | CT | FL | MA | RI | TX | VT | VA | 860-808-1412 |
| UCLA | University of California - Los Angeles (CANCELLED) | CLEC Facility, Wireless/Cellular/PCS | C | CA | 310-206-0000 |
| UCNJ | County of Union NJ | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | NJ | 908-654-9800 |
| UCNVG | Pacific Bell / Navigator UNE Complex (Cancelled) | UNE-Comp | C | CA, NV | 800-275-0014 |
| UCPNJ | Pacific Bell/Pacific Centrex Services (Cancelled) | UNE | C | CA | 800-275-0014 |
| UCPS | Union County Public School | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) PBX/PS911/Shared Tenant Other - (must identify below) | PS/ALI from Frontier | A | NC | 704-296-3160 |
| UCR | University of California Riverside | PBX/PS911/Shared Tenant | A | CA | 951-833-8921 |
| UCRIM | Pacific Bell/TMC Communications (Cancelled) | UNE-Comp | C | California | 800-275-0014 |
| UCS | Unique Communications Solutions | Database Management System Provider VPC | A | USA - Nationwide | 702-216-0266 |
| UCSB | University of California Santa Barbara - CANCELLED | PBX/PS911/Shared Tenant | C | CA | 805-893-3446 |
| UCSD | University of California San Diego | PBX/PS911/Shared Tenant | A | USA - Nationwide | California | 858-964-8198 |
| UCSDH | UCSD Health System | PBX/PS911/Shared Tenant | A | CA | 619-543-6222 |
| UCTEL | UComtel Inc | VoIP Reseller VoIP Provider | A | USA - Nation Wide | 845-625-9000 |
| UCVUL | Pacific Bell/Vertex Broadband (Cancelled) | UNE-Comp | C | California | 800-275-0014 |
| UCWMA | Pacific Bell / Anew Telecommun. Cor. (Cancelled) | UNE - Comp. | C | CA | 800-275-0014 |
| UDAC | USDATANET (INACTIVE) | Facility | C | NY | 315-952-8574 |
| UDALS | West Safety Services | PBX/PS911/Shared Tenant | A | 4807198557 | 4807198557 |
| UEA | Sun-Tel USA (INACTIVE) | CLEC Reseller, CLEC UNE | C | FL, KY | 904-731-9995 |
| UEM | CynergyComm.net Inc. - CANCELLED | CLEC Facility | C | MI | 888-257-1042 |
| UFT | United Farmers Telephone/Evertek | ILEC | A | IA | 800-242-0154 |
| UHART | University of Hartford | PBX/PS911/Shared Tenant | A | CT | 860-768-7985 |
| UHCIN | Unity Healthcare LLC | PBX/PS911/Shared Tenant | A | IN | 765 446-5321 |
| UID | Lightyear Network Solutions LLC - CANCELLED | CLEC UNE | VoIP | C | All States | 866-614-8647 |
| UIL | United Illuminating Company | PBX | A | CT | 203-926-4540 |
| UM119 | Unique Management Services | PBX/PS911/Shared Tenant | IN | 502-817-7388 | |
| UMB | University of Maryland Baltimore | PBX/PS911/Shared Tenant | A | MD | 410-706-6882 |
| UMI | Mid-Iowa Telecom LLC | CLEC Facility | A | IA | 855-643-4692 |
| UML | University of Massachusetts - Lowell(Cancelled) | PBX | C | University of Massachusetts - Lowell | 978-934-4000 |
| UMMC | University of Mississippi Medical Center - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | C | MS | 601-850-8574 |
| UMONY | Umony Limited | VoIP Reseller | A | USA - Nationwide | +441223659231 |
| UMS | University of Maine System - CANCELLED | PBX/PS911/Shared Tenant | C | ME | 207-592-3521 |
| UNBND | Unbound Systems LLC | PBX/PS911/Shared Tenant VoIP Reseller VoIP Provider | A | USA - Nationwide | 888-530-2120 |
| UNCCH | University of North Carolina at Chapel Hill (CANCELLED) | PBX/PS911/Shared Tenant, VoIP | C | UNC at Chapel Hill | 919-962-6503 |
| UNDP | United Nations Development Programme | Other - (must identify below) | Non profit International Organization | A | NY | 212-906-5000 |
| UNHQ | United Nations - CANCELLED | PBX/PS911/Shared Tenant | C | NJ | NY | 212-963-6666 |
| UNIFI | Unified Telecom Inc. DBA CCSi Communications | VoIP Reseller VoIP Provider | A | USA - Nationwide | 630-241-0600 |
| UNIMT | Univision Inc. | VoIP Reseller | A | USA - Nationwide | 406-721-8876 |
| UNION | Union Telephone Company | Facility | A | WY | CO | UT | 307-782-6131 |
| UNITS | The Ohio State University | PBX/PS911/Shared Tenant | A | OH | 614-292-2525 |
| UNITY | Unitel Inc | CLEC Facility ILEC VoIP Provider | A | ME | 207-948-5757 |
| UNIV | Oahu Transit Services Inc - CANCELLED | UNIV | C | HI | 877-374-4530 |
| UNL | Broadwing Local Services Inc. (Cancelled) | Reseller | C | OH, IN, KY | 800-735-3030 |