| CoID | Company | Type | Status | States Served | 24X7 Phone |
| ARE | Arena One LLC | VoIP Provider | A | USA | 212-231-9600 |
| ARFRE | Airadigm Communications - CANCELLED | Wireless/Cellular/PCS | C | WI | 920-707-4357 |
| ARKDN | NTT Cloud Communications US Inc. | Video Relay Service VoIP Provider Other (must identify below) | Conference Services and Cloud Voice | A | USA - Nation Wide | 442086000763 |
| ARLLN | Arialink Telecom - CANCELLED | CLEC Facililty | CLEC Reseller | CLEC UNE | VoIP Reseller | VoIP Provider | C | MI | 517-492-1350 |
| ARMSE | ARCH Medical Solutions - Seabrook | PBX/PS911/Shared Tenant | A | USA - Nationwide | 603-474-1919 |
| ARMST | Armstrong Utilities (CANCELLED) | PBX | C | PA | 724-899-2211 |
| ARNG | Arkansas Army National Guard - CANCELLED | CLEC Facility | C | USA-Nation Wide AR | 501-590-5735 |
| ARNG1 | Vermont Army National Guard | PBX/PS911/Shared Tenant | A | VT | 802-338-3050 |
| ARORA | Aurora Communications Inc c/o Wisper ISP LLC - CANCELLED | CLEC Facility VoIP Provider | C | MO | 618-206-4190 |
| ARPS | Amherst Regional Public Schools | Facility | A | MA | 413-362-1810 |
| ART | Artisan Communications (CANCELLED) | VoIP | C | KS | 866-733-8878 |
| ARTCH | AirTouch Communications (Cancelled) | ILEC | C | WA, OR, ID, UT, CO, AZ, NM, NE, WY, ND, MN, IA | 800-445-5514 |
| ASAPL | All Services Are Provided LLC | VoIP Reseller | A | Il | MO | 314-735-02077 |
| ASCC | Asnuntuck Community College - CANCELLED | VoIP | C | CT | 413-829-1977 |
| ASD16 | Arlington School District | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | USA - Nationwide | 360-913-7005 |
| ASI | Asset Sentinel Inc. (Out of Business) | PBX | C | USA | 612-934-2655 |
| ASPEN | Aspen Datacom (Cancelled) | Facility | C | IL | 773-878-3161 |
| ASPRS | Aspirus Inc | Internet Protocol Relay Provider PBX/PS911/Shared Tenant Wireless/Cellular/PCS VoIP Reseller VoIP Provider | A | MI | MN | WI | 715-847-2121 |
| ASSOC | Associated Bank - CANCELLED | 9-1-1 Admin-CPE ALI | C | WI | 715-345-4600 |
| ASTAC | Arctic Slope Telephone Association Coop Inc | ILEC Wireless/Cellular/PCS | A | AK | 877-751-5068 |
| ASTCO | Astro Telecommunications LLC - CANCELLED | CLEC Facility CLEC Reseller VoIP Reseller VoIP Provider | C | USA - Nationwide | 833-462-7876 |
| ASTND | Astound | VoIP Provider | A | USA - Nationwide | 888-972-6622 |
| ASTRO | AstroTel, Inc. (INACTIVE) | CLEC Facility | C | FL | 877-833-2453 |
| ASU | Angelo State University - CANCELLED | VoIP Provider | C | TX | 325-942-2911 |
| ASUMP | Assumption College | PBX | A | MA | 508-767-7000 |
| AT&T | AT&T | CLEC Facility | A | USA - Nationwide | 888-249-4980 |
| ATBLS | AT&T | CLEC Reseller | A | CA | 800-275-0014 |
| ATC | Alma Telephone Company Inc. | Facility | A | GA | 912-632-5911 |
| ATC83 | Advantage Telephone Communications | VoIP Provider | A | USA - Nationwide | 281-435-6348 |
| ATCID | ATC Communications Inc. | ILEC | A | ID | 208-673-5335 |
| ATCMD | Armstrong Telephone Company - Maryland | ILEC | A | MD | 877-277-5709 |
| ATCN | Armstrong Telephone Company - North | ILEC | A | PA | 877-277-5709 |
| ATCND | Armstrong Telephone Co Northern Div. | ILEC | A | WV | 877-277-5709 |
| ATCNE | ATC Communications | ILEC | A | NE | 308-962-7298 |
| ATCNY | Armstrong Telephone Company | ILEC | A | NY | 877-277-5709 |
| ATCO | Ardmore Telephone Company Inc. | ILEC VoIP Reseller | A | AL | TN | 270-856-1033 |
| ATCPA | Armstrong Telephone Company - PA | ILEC | A | PA | 877-277-5709 |
| ATCTC | American Telephone Company | CLEC Facility CLEC Reseller VoIP Reseller VoIP Provider | A | USA - Nation Wide | 888-943-8282 |
| ATCWV | Armstrong Telephone Company - WV | ILEC | A | WV | 877-277-5709 |
| ATEL | Adams TelSystems Inc. | CLEC Facility CLEC UNE VoIP Reseller VoIP Provider | A | IL | 217-696-4411 |
| ATG | ATG Communications LLC | VoIP Reseller VoIP Provider | A | USA - Nation Wide | 706-823-1449 opt 2 |
| ATG23 | Applied Technology Group | | A | | 260-482-2844 |
| ATGCO | Adams Technology Group Corp. | VoIP Reseller | A | USA - Nationwide | 208-906-8318 |
| ATGI | Advanced Telecom | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | PBX | A | CA | NV | OR | WA | 877-679-9432 |
| ATHER | Atheral LLC | VoIP Reseller VoIP Provider | A | USA - Nationwide | 702-470-2766 |
| ATHR | The Arthur Mutual Telephone Co. | LEC | A | OH | 419-393-2233 |
| ATI | Affinity Telecom, Inc.(Cancelled) | CLEC Faciliy, CLEC Reseller, CLEC UNE | C | CO | 303-961-0022 |
| ATIAR | Armstrong Telecommunications Inc | CLEC Facility | A | KY | MD | NY | OH | PA | WV | 877-277-5709 |
| ATIMN | ATI (Cancelled - See ESCH) | Facility | C | MN | 612-964-5794 |
| ATLAS | Atlas Electric Devices (Cancelled) | Facility | C | IL | 773-327-4520 |