| CoID | Company | Type | Status | States Served | 24X7 Phone |
| BECHT | Bechtel Corporation(Inactive) | PBX/PS911/Shared Tenant | C | MD, TX, AZ, VA, CA | 301-228-7700 |
| BEE | Beehive Telephone Co. | Facility | A | UT | NV | 435-837-6000 |
| BEGGS | Beggs Telephone Company | Facility | A | Beggs | OK | 918-267-9990 |
| BEK52 | BEK Communications Cooperative | Co-Op/Rural ILEC | A | ND | 701-475-1300 |
| BEKIN | The Bekin Company (Cancelled) | IT/MIS | C | IL | 708-243-0801 |
| BEL01 | Belgravia Telecommunications Company, LLC (CANCELLED) | VoIP | C | 0 | 702-403-1339 |
| BELAT | Bell Atlantic (Cancelled - See VERIZ) | | C | 0 | 617-743-0008 |
| BELIG | BellSouth Internet Group (CANCELLED) | ICP | C | LA,MS,AL,GA,FL,SC,NC,TN,KY | 800-317-3343 |
| BELKN | Belkin International Inc - CANCELLED | 9-1-1 Admin-CPE ALI | ILEC | C | CA | 800-773-7911 |
| BELSO | AT&T Southeast (formerly BellSouth) | ILEC | A | AL | FL | GA | KY | LA | MS | NC | SC | TN | 888-243-1911 |
| BELTX | City of Bellaire | PBX/PS911/Shared Tenant | A | TX | 713-668-0487 |
| BELZC | Belzoni Cable LLC | Cable Digital CLEC Facility VoIP Provider | A | USA - Nationwide Louisiana Mississippi | 662-247-1834 |
| BEM | Town of Belmont | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | MA | 617-484-1212 |
| BEMS | Bakersfield Elementary School | PBX/PS911/Shared Tenant | A | VT | 802-827-6611 |
| BENDT | BendTel | CLEC Facility | CLEC Reseller | CLEC UNE | VoIP | VoIP Reseller | A | OR | 541-389-4020 |
| BER | Bernard Telephone Company Inc. | ILEC | A | IA | 563-879-3203 |
| BERCT | Town of Berlin | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | CT | 860-828-7080 |
| BERK | Consolidated Communications of NY Company f/k/a Berkshire Te | ILEC | A | NY | 916-746-3000 |
| BERKL | Berklee College of Music | 9-1-1 Admin-CPE ALI | A | MA | 617-459-1382 |
| BERKS | Berks County Department of Emergency Services | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | PA | 610-655-4931 |
| BEVCM | BEVCOMM Inc. | ILEC VoIP Reseller VoIP Provider | A | IA | MN | WI | 507-526-2822 |
| BEVTC | BEVCOMM (Cancelled) | Facility | C | MN | 507-526-3252 |
| BF27 | BrightFlow Technologies | VoIP Reseller VoIP Provider | A | USA - Nationwide | 704-893-8445 |
| BF911 | Brooks Fiber (Cancelled - See MCI) | Facility | C | USA | 800-844-1001 |
| BFC82 | Brattleboro Food Co-op LLC | PBX/PS911/Shared Tenant | A | VT | 802-257-0236 |
| BFPD | Byron Forest Preserve District | 9-1-1 Admin-CPE ALI | PBX/PS911/Shared Tenant | A | IL | 815-985-4353 |
| BFRC | BFS Retail & Commercial Operations - CANCELLED | PBX/PS911/Shared Tenant | C | IL | 800-773-7911 |
| BGC | Bluegrass Cellular Inc | Cellular | A | KY | 270-352-7000 |
| BGE | Exelon Corporation - CANCELLED | PBX/PS911/Shared Tenant | C | DE | DC | MD | NJ | PA | VA | 410-470-1200 |
| BGRV | Brooke Grove Retirement Village | PBX/PS911/Shared Tenant | A | MD | 301-924-5176 |
| BGSU | Bowling Green State University | PBX/PS911/Shared Tenant | A | OH | 419-372-0999 |
| BGTC | Bluegrass Telephone Company - CANCELLED | Facility | C | KY | 270-242-3600 |
| BGTCO | Burke's Garden Telephone Company Inc. | ILEC | A | VA | 276-472-2345 |
| BHCWA | Bayer HealthCare (Cancelled) | PBX | C | WA | 425-245-1245 |
| BHEC | Bangor Hydro-Electric Co. - CANCELLED | PBX | C | ME | 207-942-4416 |
| BHF | Vast Broadband | CLEC Facility | A | MN | SD | 605-965-7737 |
| BHM | BrahmaCom, Inc. (Cancelled) | Facility | C | MA | 781-433-0333 |
| BHNIS | Charter Fiberlink DBA Brighthouse Networks - CANCELLED | Cable Digital | C | USA - Nationwide | 844-612-9261 |
| BHQ | Bloomingdale Home Telephone Company Inc. | ILEC | A | IN | 765-363-0401 |
| BIF | BinFone Telecom LLC (INACTIVE) | VoIP, VoIP Reseller | C | ALL | 800-998-5911 |
| BIIB | Biogen Idec Inc. - CANCELLED | 9-1-1 Admin-CPE ALI | C | CA | DC | MA | NC | 617-679-2040 |
| BIJOU | Bijou Telephone Co-Op | ILEC | A | CO | 303-822-5400 |
| BIRCH | Birch Communications | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) CLEC Facility CLEC Reseller CLEC UNE VoIP Reseller VoIP Provider | A | USA | 877-727-2117 |
| BIS | Bonham Independent School - CANCELLED | PBX/PS911/Shared Tenant | C | TX | 903-640-9149 |
| BISD | Bryan ISD - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP Only) | DB Mgmt System Provider | C | TX | 979-224-0237 |
| BISI | Business Information Solutions Inc. | VoIP Provider | A | AL | FL | LA | MS | 2515042556 |
| BIT | Empower Telecom Inc | ILEC | A | VA | 434-636-2274 |
| BITCO | BitCom | VoIP Provider | A | FL | GA | 844-246-8647 |
| BIW | General Dynamics Bath Iron Works | PBX/PS911/Shared Tenant | A | Maine | 207-442-2266 |
| BIXBY | Bixby Telephone Co. | ILEC | A | OK | 918-366-8000 |