| CoID | Company | Type | Status | States Served | 24X7 Phone |
| ALLU | All Utilities, LLC (Out of Business) | Switch | C | Cherfield | 804-359-3711 |
| ALMA | Alma Telephone Company | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | MO | 660-641-2296 |
| ALMAC | Alma College | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | MI | 989-463-7777 |
| ALNOV | Alpha Innovations | USA - Nationwide | A | USA - Nationwide | 304-201-7485 |
| ALNT | Alltel Communications, Inc. (Cancelled) | Facility | C | NE, IA, KS | 800-678-7169 |
| ALOHA | Bing Enterprises - CANCELLED | VoIP | C | HI | 808-356-2901 |
| ALPBK | Alpine Bank & Trust Co. - CANCELLED | PBX/PS911/Shared Tenant | C | IL | 815-298-1697 |
| ALPHA | Alpha Phone, Inc (INACTIVE) | Facility | C | LATA 132 | 718-436-4919 |
| ALPIN | Alpine Communications | ILEC | A | IA | 800-635-1059 |
| ALPMI | Alpine-Michigan (Cancelled) | Cellular | C | MI, MA | 800-968-7335 |
| ALRB | Air Link Rural Broadband LLC | VoIP Provider | A | MO | 660-722.4566 |
| ALSD | Alexander Local School District | PBX/PS911/Shared Tenant | A | OH | 740-707-5918 |
| ALT | Venus Telephone Co. | ILEC | A | Counties: Venango | Clarion | Forest | 814-354-6123 |
| ALTCO | Altitude Communications | VoIP Reseller VoIP Provider | A | USA - Nationwide | 403-538-8888 |
| ALTEA | ALTEA USA (INACTIVE) | Reseller | C | US, Canada | 888-242-5832 |
| ALTEL | Allied Telecom Group LLC - CANCELLED | ILEC | VoIP Provider | C | 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 |