| CoID | Company | Type | Status | States Served | 24X7 Phone |
| ACSI | Xspedius Management Company (CANCELLED) | Facility | C | AL, AR, AZ, CO, DC, FL, GA, KS, KY, LA, MD, MO, MS, NC, NM, | 800-937-7473 |
| ACT | Advanced Communications Technology Inc. | CLEC Facility CLEC Reseller CLEC UNE Co-Op/Rural ILEC VoIP Reseller VoIP Provider | A | WY | 307-673-0910 |
| ACTCI | Absaraka Cooperative Telephone Co. Inc. - CANCELLED | ILEC | C | ND | 701-896-3404 |
| ACTCO | Action Communications Inc. | Facility | A | NE | 308-632-7836 |
| ACTEL | Actel Integrated Communications, Inc. (Cancelled) | ICP | C | ALL | 877-700-9400 |
| ACTMA | Town of Acton - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | C | MA | 978-929-7711 |
| ACWAK | Alaska Communications Systems - CANCELLED | Wireless/Cellular/PCS | C | AK | 907-564-1642 |
| ADAMS | Adams Telephone Co-operative | Co-Op/Rural ILEC | A | IL | 217-696-4411 |
| ADAPT | Adaptium Technology | Other - (must identify below) | hosted pbx only | A | USA - Nation Wide | 858-206-9111 |
| ADB10 | Elevation Education Solutions LLC - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) PBX/PS911/Shared Tenant VoIP Reseller | C | USA - Nationwide | 714-470-8766 |
| ADH17 | New Test | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | | USA - Nationwide | 2026185997 |
| ADI | Analog Devices (INACTIVE) | PBX | C | Two buildings in Wilmington | 781-937-2880 |
| ADREM | Adrem Technologies | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) VoIP Reseller VoIP Provider | A | USA - Nation Wide | 801-889-2304 |
| ADS | Atlantic Digestive Specialists PLLC | PBX/PS911/Shared Tenant | A | NH | 603-692-2228 |
| ADSC | Airbus DS Communications Inc. | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | FL | MD | NC | PA | TX | VA | 844-291-6988 |
| ADTI | Advanza Telecom Inc. - CANCELLED | CLEC UNE | VOiP | C | NJ | 888-423-8269 |
| ADV | Advanced Communications LLC | VoIP Provider | A | USA - Nationwide | 844-418-8647 |
| ADVG | Advantage Cellular Systems - CANCELLED | Carrier | C | TN | 615-464-2355 |
| ADVNT | Advanced Networking Inc. | Other | Interconnect providing in-house hosted services | A | USA - Nationwide | 302-792-9200 |
| ADVTL | Advanced Telephone | CLEC | A | LA | 225-621-4288 |
| AECI | Arrowhead Electric Cooperative Inc | CLEC Facility Co-Op/Rural | A | MN | 218-663-7239 |
| AEGON | Aegon USA / Transamerica | PBX/PS911/Shared Tenant | A | AK | CA | CO | DC | FL | GA | IL | IA | KY | MD | MI | MN | NJ | NY | NC | OH | PA | TX | VA | 319-355-4357 |
| AENCO | Aeneas Communications | CLEC Facility CLEC Reseller CLEC UNE VoIP Reseller VoIP Provider | A | TN | 731-554-3389 |
| AERL | Aerial Communications (Out of Business) | Wireless | C | USA | 206-663-7927 |
| AERO | The Aerospace Corporation | PBX | A | AL | CA | CO | MD | NE | NM | VA | 310-336-7000 |
| AERON | Taurus Technology Investment Partners | VoIP Reseller | | AZ | CA | CO | NM | WA | 928-284-9900 |
| AES | Auburn Essential Services | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | IN | 260-333-0200 |
| AFFTS | Affiliated Technology Solutions LLC | PBX/PS911/Shared Tenant VoIP Provider | A | USA - Nationwide | 908-565-4280 |
| AFMTC | Ayrshire Farmers Mutual Telephone Co (Cancelled) | LEC | C | Ayrshire & Gillett Grove Iowa | 712-426-2800 |
| AFNI | American Fiber Network Inc. - CANCELLED | UNE-P | Res | C | MO | KS | UT | 800-864-0583 |
| AFNTY | Affinity VoIP Telecom Inc. - CANCELLED | Reseller | C | All | 503-564-4611 |
| AFTEL | Affordable Telecom (Fitch) (Cancelled) | Wireless/Cellluar/PCS | C | TX | 361-600-1401 |
| AGCOM | Agility Communications and Technology Services Company | VoIP Provider | A | USA - Nationwide | 217-391-9290 |
| AGIST | Airnet Group Inc - CANCELLED | VoIP Reseller | C | USA | 423-664-7678 |
| AGLNT | Agilent Technologies - CANCELLED | PBX/PS911/Shared Tenant | C | CA | 866-787-3937 |
| AGORA | Wall Street Daily - CANCELLED | PBX/PS911/Shared Tenant | C | FL | MD | 410-864-1677 |
| AGR | Americas Gardening Resource dba Gardener's Supply Co | PBX/PS911/Shared Tenant | A | NH | VT | 802 316-6136 |
| AGTEL | Alhambra-Grantfork Telephone Company | ILEC | A | IL - Alhambra Village | Grantfork Village | 618-488-2165 |
| AGW | Airgate Wireless, Inc. (Out of Business) | Wireless | C | SC, NC, GA | 888-859-1400 |
| AHAY | Netlever IT | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | 27502-6491 | 919-272-5373 |
| AHC | Allan Hancock College | CLEC Reseller | A | CA | 805-346-1007 |
| AHF | Castleberry Telephone Co Inc. | ILEC | A | AL | 251-966-2118 |
| AHLMH | Ahlstrom-Munksjo Filtration LLC | PBX/PS911/Shared Tenant | A | PA | 717-385-6843 |
| AHLTV | Ahlstrom Filtration LLC | PBX/PS911/Shared Tenant | A | IL | 217-827-1418 |
| AHORG | Adventist Health - CANCELLED | PBX/PS911/Shared Tenant | C | CA | HI | OR | WA | 707-277-1143 |
| AHOSP | Albemarle Hospital - CANCELLED | PBX | C | NC | 252-335-0531 |
| AHS01 | Atlantic Health System - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | C | NJ | 201-230-5712 |
| AICIL | Allstate Insurance Company - CANCELLED | PBX/PS911/Shared Tenant | C | IL | 847-402-3760 |
| AICNH | Albany International Corp | PBX/PS911/Shared Tenant | A | NH | NY | SC | TX | WI | 603-330-5800 |
| AIETS | AIE TEchnology Solutions Inc. | PBX/PS911/Shared Tenant VoIP Reseller | A | USA - Nationwide | 617-977-5229 |