| CoID | Company | Type | Status | States Served | 24X7 Phone |
| ALTEA | ALTEA USA (INACTIVE) | Reseller | C | US, Canada | 888-242-5832 |
| ALTEL | Allied Telecom Group LLC | ILEC | VoIP Provider | A | DE | DC | MD | VA | 202-349-0440 |
| ALTEV | Alteva - Cancelled (See MOMTM) | VoIP Provider | C | USA - Nation Wide | 877-258-3828 |
| ALTGN | Altigen Communications Inc - CANCELLED | PBX/PS911/Shared Tenant VoIP Provider | C | USA - Nationwide | 408-597-9000 |
| ALTI | Verizon Business | VoIP Provider | A | USA - Nationwide | 800-483-0911 |
| ALTUS | Altus | VoIP Reseller VoIP Provider | A | USA - Nationwide | 615-465-4001 |
| ALTVX | Altavox Telecom Inc - CANCELLED | VoIP Reseller VoIP Provider | C | USA | 877-743-9128 |
| ALU | Alcatel-Lucent Enterprise | PBX/PS911/Shared Tenant | A | USA - Nationwide | 650-385-2193 |
| ALVOI | Allvoi - CANCELLED | VoIP Provider | C | USA | 516-960-0760 |
| ALWIR | Alambama Wireless, Inc. (Out of Business) | Cellular | C | AL-Morgan, Cullman, Blount, Lawrence, Franklin, Marion, and | 256-308-2922 |
| ALZ | Alianza | VoIP Provider | A | USA | 801-717-1230 |
| AMACA | AMADOR COUNTY CA | PBX/PS911/Shared Tenant | A | CA | 209-223-6591 |
| AMATL | AMA Communications LLC dba AMA TechTel Communications | Facility | A | TX | 806-322-2222 |
| AMAVK | American AVK Company - CANCELLED | PBX/PS911/Shared Tenant | C | NV | 775-309-7367 |
| AMBIT | AMBIT SOLUTIONS LLC | PBX/PS911/Shared Tenant Wireless/Cellular/PCS VoIP Provider | | USA - Nationwide | 205-829-1800 |
| AMBT | American Broadband & Telecommunications | CLEC Facility CLEC Reseller | A | IL | IN | MI | OH | PA | WV | WI | 419-290-1033 |
| AMC | American MetroComm (Out of Business) | CLEC | C | LA | 504-200-2118 |
| AMCC | Ashford Meadows Cable & Comm (Cancelled) | CLEC | C | VA | 804-288-5500 |
| AMCCC | AMCOM Communications Corporation - CANCELLED | Reseller | C | CA | 714-307-1777 |
| AMCEL | American Cellular Wireless (CANCELLED) | WSP | C | TN4,KY4,KY6,KY8,NY5,NY6,MN6,MN2,MN3,MN4,OH7,WV1,WV2,PA9 | 423-318-2139 |
| AMCI | Ameritech Cellular Services (Cancelled) | Cellular | C | IN, IL, WI, OH, MI, MO | 847-765-5300 |
| AMCII | Atlantic Metro Communications II Inc | VoIP Provider | A | USA - Nationwide | 866-365-6246 |
| AMCOM | American Com - CANCELLED | Reseller | C | CO | 877-410-1663 |
| AMCVA | Augusta Health | CLEC Facility ILEC PBX/PS911/Shared Tenant | A | VA | 540-332-4000 |
| AMERE | Ameren Corp - CANCELLED | PBX/PS911/Shared Tenant | C | IL | 314-206-0662 |
| AMERI | AmeriMex Communications Corp - CANCELLED | CLEC Facility | CLEC Reseller | CLEC UNE | C | AL | FL | GA | KY | NC | SC | 404-392-1999 |
| AMG | Affiliated Managers Group Inc - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | C | MA | 617-747-3371 |
| AMH01 | Amherst College | PBX | A | MA | 413-542-5823 |
| AMHST | Town of Amherst MA - CANCELLED | VoIP | C | Amherst | MA | 413-259-3000 |
| AMHT1 | Amherst County | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | VA | 434-946-9300 |
| AMI | Applied Messaging Inc. | VoIP Provider | A | USA - Nationwide | 505-814-7050 |
| AMICA | Y-12 Wireless, d/b/a Amica Wireless (Cancelled) | Facility | C | IL | 309-262-9757 |
| AMPCA | Amplisys Inc. | VoIP Provider | | USA - Nationwide | 1-514-225-4141 |
| AMPLX | Amplex Internet | VoIP Reseller VoIP Provider | A | MI | OH | 4198375015 |
| AMPRS | Ameriprise Financial Inc | PBX/PS911/Shared Tenant | A | IL | MA | MN | NV | NY | 612-671-2454 |
| AMPT | A101 Technology LLC dba Amp Telecom | PBX/PS911/Shared Tenant VoIP Reseller VoIP Provider | A | USA - Nationwide | 512-874-3261 |
| AMR | Applied Medical Resources - CANCELLED | PBX/PS911/Shared Tenant | C | USA - Nation Wide | 949-713-8500 |
| AMS | All My Sons | PBX/PS911/Shared Tenant | A | USA - Nation Wide | 469-461-5000 |
| AMSCO | Attitash Mountain Service Co LLC | PBX/PS911/Shared Tenant | A | NH | 603-356-6321 |
| AMSOF | Amcom Software Inc | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | USA | 888-797-7487 |
| AMTC | Amherst Telephone Company | ILEC | A | Portage | Marathon | Waupaca Counties | WI | 715-824-5025 |
| AMTCA | Agate Mutual Telephone Coop Assoc. - CANCELLED | Facility | C | CO | 719-764-2578 |
| AMTCH | AT&T Midwest (formerly Ameritech) | ILEC | A | IN | IL | MI | OH | WI | 888-243-1911 |
| ANALO | Analog Devices - CANCELLED | PBX | C | Norwood Campus | 3 buildings | 781-461-3500 |
| ANB22 | Alaska Native Broadband 1 License LLC - CANCELLED | Wireless/Cellular/PCS | C | TX | NM | OH | CO | KY | 866-688-6058 |
| ANC | Advanced Network Communications LLC | Facility | Reseller | A | IA | 712-275-4861 |
| ANDR | ANDREW TELEPHONE COMPANY INC. | ILEC | A | IA | 563-773-2213 |
| ANDRO | Androscoggin County | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) PBX/PS911/Shared Tenant | A | ME | 207-753-2500 |
| ANEW | Think Anew - CANCELLED | VoIP Reseller | C | MS | 888-551-9296 |
| ANI | American Network, Inc. (Cancelled) | Facility | C | USA | 917-854-7600 |