| CoID | Company | Type | Status | States Served | 24X7 Phone |
| BIZVO | BizVox Communications | VoIP Reseller | A | USA - Nationwide | 843-628-0860 |
| BKSCH | The Berkshire School | PBX/PS911/Shared Tenant | A | USA - Nation Wide | 412-229-1136 |
| BKST | Brookstone Company Inc. | PBX/PS911/Shared Tenant | A | NH | 603 577-8212 |
| BLANC | Blanca Telephone Co | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) Co-Op/Rural Wireless/Cellular/PCS VoIP Provider | A | CO | 719-206-8109 |
| BLC | Ben Lomand Communications Inc. | IXC | CLEC Facility | A | TN Cities: McMinnville | Sparta | 931-668-1000 |
| BLDLM | Bloomingdale Telephone Company | CLEC Facility | ILEC | A | MI | 269-521-7300 |
| BLDW | Baldwin Telecom | ILEC | A | WI | 715-688-1090 |
| BLFAC | Blue Lake Fine Arts Camp | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | MI | 231-740-3665 |
| BLHKE | Black Hawk College - East Campus | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | IL | 309-854-1784 |
| BLIND | Perkins School for the Blind (CANCELLED) | PBX | C | MA | 617-972-7602 |
| BLINK | Brightlink Communications | VoIP Provider | A | USA - Nation Wide | 970-722-6220 |
| BLKDK | Blackduck Telephone Company(Cancelled) | LEC | C | phone area codes 218, 835, 374 | 218-835-4941 |
| BLKFT | Blackfoot Telephone (CANCELLED) | ILEC | C | MT | 406-541-5000 |
| BLM | City of Bloomington | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | IL | 309-275-1752 |
| BLNC | Blanchard Telephone | ILEC | A | MI | 989-561-9905 |
| BLNTX | Blinn College - CANCELLED | PBX/PS911/Shared Tenant | C | TX | 979-777-7774 |
| BLO | Borderland Communications LLC - CANCELLED | Facility | C | MI | 906-771-1000 |
| BLOMU | Commonwealth University of Pennsylvania | PBX/PS911/Shared Tenant | A | PA | 570-484-2287 |
| BLOOM | Bloomer Telephone Company | ILEC | A | WI | 715-568-4880 |
| BLRVC | Blueriver Communications Inc. | CLEC Facility VoIP Provider | A | IN | 877-883-4259 |
| BLSFE | PAVE Digital Inc - CANCELLED | VoIP Reseller | C | USA - Nation Wide | 650-575-6918 |
| BLSTM | Consolidated Communications of Kansas Company f/k/a Bluestem | ILEC | A | KS | 916-746-3000 |
| BLTC | Ben Lomand Telephone Cooperative Inc. | Co-Op/Rural | ILEC | A | TN | 931-668-1000 |
| BLUE | Blue Valley Tele-Communications Inc | Co-Op/Rural | A | Kansas | 785-799-3311 |
| BLUET | Bluetone Communications LLC | VoIP Reseller | A | USA - Nation Wide | 614-656-1181 |
| BLUIP | BluiP Inc. | VoIP Reseller | A | USA - Nation Wide | 702-690-4400 |
| BMF | Metro FiberNet LLC d/b/a MetroNet | CLEC Facility | A | IN | 877-407-3224 |
| BMGF1 | Bill and Melinda Gates Foundation - CANCELLED | PBX/PS911/Shared Tenant | C | DC | 800-773-7911 |
| BMHVT | Brattleboro Memorial Hospital | PBX/PS911/Shared Tenant | A | VT | 802-257-0341 |
| BMHWV | Boone Memorial Hospital Inc. | PBX/PS911/Shared Tenant | A | WV | 304-369-1230 |
| BMTC | Brindlee Mountain Telephone Company (Otelco) (CANCELLED) | Facility | C | Arab, AL; Morgan City, AL; Union Grove | 256-586-4156 |
| BMWNA | BMW North America, Inc. (Cancelled) | PBX | C | Oxnard, CA | 201-307-3771 |
| BNA | BNA, Inc. (CANCELLED) | PBX/PS911/Shared Tenant | C | VA | 703-341-2222 |
| BNBK1 | Banterra - CANCELLED | PBX | C | IL | 618-993-9891 |
| BNC | BuzNet Communications | VoIP Provider | A | TN | TX | 214-316-8889 |
| BNRBK | Banner Bank dialtone by Verizon - CANCELLED | PBX/PS911/Shared Tenant | C | WA | 800-773-7911 |
| BNTC | Baldwin Nashville Telephone Company Inc | ILEC | A | IA | 563-673-6001 |
| BNTVL | Consolidated Communications of Pennsylvania Company (fka Ben | ILEC | A | PA | 916-746-3000 |
| BOA | Bridges Owners Association Inc. - CANCELLED | PBX/PS911/Shared Tenant | C | VT | 802-583-2922 |
| BOAZ | Boaz Media Network Solutions | VoIP Reseller | A | USA - Nationwide | 706-745-6991 |
| BOE01 | The Boeing Company dialtone by ATT/TCG(Cancelled) | VoIP | C | AL,AZ,CA,CO,DE,FL,GA,ID,IL,MD,MO,MN,NJ,OR,OK,PA,TX,UT,VA,WA | 425-373-2977 |
| BOK12 | Byron Community Unit School District 226 - CANCELLED | PBX | C | IL | 815-234-5491 |
| BOND | Bond County ETSB (Cancelled) | PSAP | C | IL - Bond County | 618-664-1911 |
| BOONE | Boone County - CANCELLED | LEC | C | IL | 815-544-2144 |
| BORD | Border to Border Communications Inc. | ILEC | A | TX | 956-936-2000 |
| BOSCH | Robert Bosch LLC(Inactive) | PBX/PS911/Shared Tenant | C | USA | 574-237-2104 |
| BOSU | Trustees of Boston University - CANCELLED | Internet Protocol Relay Provider | C | MA | 617-353-2121 |
| BOWDN | Bowdoin College(Inactive) | PBX/PS911/Shared Tenant | C | Brunswick, ME | 207-725-3314 |
| BOXMA | Town of Boxborough - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | C | MA | 978-264-1750 |
| BPCC | Bright Pattern | VoIP Reseller VoIP Provider | A | USA - Nationwide | 650-529-4099 |