| CoID | Company | Type | Status | States Served | 24X7 Phone |
| BBNS | Buckingham Browne and Nichols School(Inactive) | PBX/PS911/Shared Tenant | C | MA | 617-593-5582 |
| BBO | BroadBand Office Inc. (Cancelled) | Facility, reseller | C | AZ, CA,CO, DC, FL, GA, IL, IN, MA, MI, MN, MO, NC, NY, NJ, O | 888-746-4226 |
| BBTEL | Cloudli Communications Inc. | VoIP Provider | A | USA - Nationwide | 514-879-8522 |
| BBURG | Brandenburg Telecom LLC | Facility | A | KY | 270-422-2121 |
| BBV | Broadband Voice LLC dba Fuse.Cloud | VoIP Reseller | A | USA | 844-926-6000 |
| BBW | Bluebird Wireless - CANCELLED | VoIP | C | US | 318-908-1000 |
| BCA | Business Communication Analysts Inc - CANCELLED | CLEC Facility | CLEC Reseller | VoIP | C | MI | IL | IN | 800-774-5091 |
| BCALL | BryteCall LLC | PBX/PS911/Shared Tenant VoIP Provider | A | USA - Nationwide | 305-809-8999 |
| BCASA | Blue Casa Telephone LLC | CLEC Facility | A | CA | 619-253-8434 |
| BCBSM | Blue Cross Blue Sheild MA - CANCELLED | ILEC PBX/PS911/Shared Tenant | C | MA | 617-246-5000 |
| BCC01 | Bay Creek Communications - CANCELLED | VoIP | C | Cape Charles | VA | 757-331-8700 |
| BCCH | Brigham City Community Hospital | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | UT | 801-299-2468 |
| BCCIT | Collier County BCC | 9-1-1 Admin CPE ALI | A | FL | 239-280-6914 |
| BCH | Hawaii Medical Service Association - CANCELLED | PBX/PS911/Shared Tenant VoIP Provider | C | HI | 808-948-5102 |
| BCI | BroadSpan Communications, Inc. (Cancelled) | CLEC | C | MO | 800-901-7727 |
| BCI01 | Blackfoot Communications (INACTIVE) | CLEC | C | MT | 406-541-5000 |
| BCID | Blue Cross of Idaho | PBX/PS911/Shared Tenant | A | ID | 208-331-7200 |
| BCINC | Bulloch Cellular Inc | CLEC Facility | A | GA | 912-865-1100 |
| BCMI | Branch County MI | ILEC | A | MI | 517-279-5126 |
| BCN01 | BCN Telecom | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) VoIP Reseller | A | USA - Nationwide | NJ | 908-367-5958 |
| BCO | Backbone Communications, Inc. (Cancelled) | Facility | C | CA, CO, FL, IL, MA, NY, TX, WA | 800-987-1111 |
| BCOMM | Bullitt Communications dba Richon Inc. | VoIP Provider | A | MT | 406-752-5374 |
| BCPL | Baltimore County Public Library - CANCELLED | PBX/PS911/Shared Tenant | C | MD | 800-333-9873 |
| BCSNC | Business Communication Systems of NC - CANCELLED | CPE Privider | C | NC | SC | 252-636-0766 |
| BCT | Skyline Telecom Inc | ILEC | A | WA | 541-932-4498 |
| BCTC | Benton Cooperative Telephone Company | ILEC | A | MN | 320-393-2115 |
| BCUSD | Belvidere Community School District | PBX/PS911/Shared Tenant | A | IL | 800-773-7911 |
| BCVT1 | Blue Cross and Blue Shield of Vermont | PBX/PS911/Shared Tenant | A | VT | 802-371-3370 |
| BDF | Biddeford Internet | CLEC Facility | A | ME | 800-229-2096 |
| BDO | BDO Seidman, LLP (Cancelled) | PBX | C | Chicago, IL | 800-844-1001 |
| BDVX | Broadvox LLC | VoIP Reseller VoIP Provider | A | MN | 800-933-1224 |
| BEA | Bureau of Economic Analysis | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | MD | 301-278-9407 |
| 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 | PBX/PS911/Shared Tenant | 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 |