| CoID | Company | Type | Status | States Served | 24X7 Phone |
| ANI | American Network, Inc. (Cancelled) | Facility | C | USA | 917-854-7600 |
| ANKUS | Andrews Kurth - CANCELLED | PBX/PS911/Shared Tenant | C | TX | 713-220-4200 |
| ANM | Advanced Network Management Inc | VoIP Provider | A | USA - Nationwide | 505-515-3333 |
| ANN | Ann Taylor (CANCELLED) | PBX/PS911/Shared Tenant VoIP | C | NY | 212-541-3341 |
| ANN2 | Ann Taylor, Inc. (Cancelled) | VoIP | C | CT | 212-541-3343 |
| ANPI | ANPI Business LLC - CANCELLED | CLEC Facility | CLEC Reseller | VoIP Reseller | VoIP Provider | C | USA - Nationwide | 855-404-4768 |
| ANT45 | Alternate Network Technologies | VoIP Provider | A | USA - Nationwide | CA | 818-465-9990 |
| ANTEI | ANTEIL INC | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) VoIP Reseller | A | USA - Nation Wide | 717-671-1141 |
| ANTRM | Antrim County | PS/ALI | A | MI | 800--773-7911 |
| ANW | AN Subsidiary, LLC (CANCELLED - SEE ATTMO) | Wireless/Cellular/PCS | C | WA,MT,HI,TX,WY,ND,OK,MI,Wv,VT,AK | 972-583-3000 |
| AOI | Atlantech Online Inc. | CLEC Facility VoIP Reseller VoIP Provider | A | USA - Nation Wide | 301-755-2224 |
| AOINC | Access One Inc. | CLEC Facility | A | IL | 800-804-8333 |
| AOL | AOL (CANCELLED) | VoIP | C | USA | 703-265-4667 |
| AOS92 | AOS92 - Kennebec Valley Consolidated Schools - CANCELLED | PBX/PS911/Shared Tenant | C | ME | 207-873-4281 |
| AOSG | Airone Solutions Group LLC | VPC | A | USA - Nationwide | 732-766-2475 |
| APAM | Amundi Pioneer Asset Management | PBX/PS911/Shared Tenant | A | MA | 617-422-4357 |
| APDMH | Alice Peck Day Memorial Hospital | PBX/PS911/Shared Tenant | A | NH | 603-443-9597 |
| APEIR | Apeiron Systems Inc. | VoIP Provider | A | USA - Nation Wide | 310-705-0050 |
| APHRD | USDA APHIS - CANCELLED | 9-1-1 Admin-CPE ALI | C | MD | 301-672-0907 |
| API | Access Point Inc. | Cable Digital CLEC Facility CLEC Reseller CLEC UNE PBX/PS911/Shared Tenant VoIP Provider | A | USA - Nation Wide | 877-419-4274 |
| APL | Johns Hopkins University Applied Physics Laboratory (JHUAPL) | Other | Company Internal MLTS | A | MD | VA | 240-228-3333 |
| APOG | Apogee Telecom (CANCELLED) | Reseller | C | TX | 888-245-0608 |
| APOLO | Apollo Group, Inc. (CANCELLED) | PBX/PS911/Shared Tenant | C | USA | 602-557-6600 |
| APS | Alpena Public School District | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | MI | 989-358-5200 |
| APSD | Alpena Public School District(Cancelled) | PBX/PS911/Shared Tenant | C | MI | 800-773-7911 |
| APTAK | AP&T Wireless Inc | PBX/PS911/Shared Tenant | A | AK | 866-793-4179 |
| APU | Azusa Pacific University - CANCELLED | PBX/PS911/Shared Tenant | C | CA | 626-815-3898 |
| APW | Altmar Parish Williamstown Central School District | Other | PS/ALI or Private Switch | A | NY | 800-773-7911 |
| AQMD | South Coast Air Quality Management District | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | CA | 909-718-9097 |
| ARAMK | ARAMARK Corporation - CANCELLED | PBX/PS911/Shared Tenant | C | Philadelphia | PA | 215-238-3001 |
| ARBIT | NIELSEN/ARBITRON | PBX/PS911/Shared Tenant | A | MD | 410-312-8000 |
| ARBL | Arbella Mutual Insurance Company | ILEC | A | CT | MA | 617-328-2525 |
| ARBRS | Arbros Communications, Inc. (Cancelled) | Facility | C | ALL | 877-427-2767 |
| ARC | ARC Networks dba InfoHighway Communications(Cancelled) | Reseller | C | CT | 888-272-6389 |
| ARCAD | Arcadia Telephone Cooperative - CANCELLED | ILEC | C | IA | 712-689-2238 |
| ARCOR | Antero Resources Corporation | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | CO | OH WV | 303-357-7310 |
| 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 | 866-922-9566 |
| 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 |