| CoID | Company | Type | Status | States Served | 24X7 Phone |
|---|---|---|---|---|---|
| CHI | Christian Homes Inc. | VoIP Provider | A | IL | IN | IA | MO | 618-444-8036 |
| CHIB | Chibardun Telephone Cooperative Inc | CLEC Facility | ILEC | A | WI | 715-458-5400 |
| CHICK | Chickasaw Telephone Company | Facility | A | OK | 580-622-2100 |
| CHILL | Horizon Chillicothe Telephone | Cable Digital | ILEC | Voip Provider | A | OH | 800-457-4417 |
| CHINA | Consolidated Communications of Maine Company (fka China Tele | ILEC | A | ME | 916-746-3000 |
| CHINO | Chino Valley Unified School District | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | CA | 909-628-1201 |
| CHKN | Chickentec LLC | VoIP Reseller VoIP Provider | A | USA - Nationwide | 904-990-1041 |
| CHLB | COMMUNITY HOSPITAL LONG BEACH | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | CA | 562-619-1073 |
| CHLK | NAWCWD | Other - (must identify below) | PBX-Base Communications Office | A | CA | 760-939-4114 |
| CHLLC | Citynet Holdings LLC | CLEC Facility | CLEC Reseller | CLEC UNE | A | AZ | IN | OH | PA | WV | 304-848-5435 |
| CHMPL | Champlain Telephone Company | ILEC | A | NY | 518-298-2411 |
| CHMS | Camels Hump Middle School - CANCELLED | ILEC | C | VT | 802-434-2188 |
| CHOAT | Choate Rosemary Hall | PBX/PS911/Shared Tenant | A | Choate Campus | Wallingford CT | 203-697-2400 |
| CHOIC | Choice Wireless LC - CANCELLED | Wireless/Cellular/PCS | C | TX | OK | 940-237-1234 |
| CHOP | The Children's Hospital of Philadelphia | Other (must identify below) | Hospital Service Using PotVoip Technology | A | NJ | PA | 215-590-5550 |
| CHOUT | Consolidated Communications of Oklahoma Company | ILEC | A | OK | 916-746-3000 |
| CHP | Country Home Products Inc - CANCELLED | PBX/PS911/Shared Tenant | C | VT | 802-877-1200 |
| CHRKE | Cherokee Telephone Company | ILEC | A | OK | 580-916-2624 |
| CHRSP | Houston Chronicle - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) PBX/PS911/Shared Tenant VoIP Provider | C | TX | 713-362-7085 |
| CHSCO | County of Chester | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | PA | 800-773-7911 |
| CHSD | CHSD218(Inactive) | VoIP | C | IL | 815-791-2998 |
| CHSI | Copley Hospital | PBX/PS911/Shared Tenant | A | VT | 802-888-8888 |
| CHSN | Chesnee Telephone Company Inc. | ILEC VoIP Provider | A | NC | SC | 803-326-7370 |
| CHTL | Chesapeake Telecommunications Corp (Cancelled) | Facility | C | VA | 804-313-2257 |
| CHTR | Charter Fiberlink LLC - CANCELLED | Cable Digital | C | USA - Nationwide | 844-612-9261 |
| CHUG | The Chugwater Telephone Company | ILEC | A | WY | 307-422-3535 |
| CHUSD | Chester Upland School District(Inactive) | ILEC, VoIP | C | PA | 800-876-9823 |
| CHW | Christopher Heights of Webster (Cancelled) | Facility | C | Webster, MA | 508-397-0400 |
| CIANG | Channel Islands ANG - CANCELLED | 9-1-1 Admin-CPE ALI; /PBX/PS911/Shared Tenant;Wireless/Cellular/PCS | C | CA | 888-920-2656 |
| CICC | Colusa Indian Community Council | PBX/PS911/Shared Tenant | A | CA | 530-458-2762 |
| CICLL | Creative Interconnect Communications LLC - CANCELLED | Reseller | UNE-P | Switched services | C | CA | 650-595-5555 |
| CICOM | C-I Communications Inc - CANCELLED | CLEC Facility | C | MN | 218-454-1234 |
| CIMCO | First Communications dba Cimco - CANCELLED | CLEC Facility | C | IL | 800-860-2934 |
| CIMRN | Cimarron Telephone Company | Facility | A | OK | 918-865-3311 |
| CINBT | Cincinnati Bell (now altafiber) | ILEC | A | Kentucky | Ohio | Indiana | 513-566-6278 |
| CING | Cingular Wireless (Cancelled - see ATTMO) | Wireless | C | ALL | 800-635-6840 |
| CIOLY | City of Olympia | Other | Local Government | A | WA | 360-753-8322 |
| CIP | Clearly IP Inc | VoIP Reseller | A | USA - Nationwide | 920-383-3100 |
| CIRCL | CIRCLS - CANCELLED | VoIP Reseller | C | USA - Nation Wide | 214-463-2579 |
| CISD | Coppell ISD | Other | SIP | A | Texas | 214-496-6950 |
| CITG | Citizens Telephone | ILEC | A | GA | 229-874-9000 |
| CITHM | Citizens Telephone Company of Hammond NY Inc | Facility | A | Hammond | NY | Macomb | NY St Lawrence County Jefferson Count | 315-324-5911 |
| CITRX | Citrix Communciations LLC | CLEC Facility | A | CA | IL | MA | NY | VA | 805-690-2399 |
| CITTC | Citizens Telephone Cooperative Inc. | ILEC | A | WI | 715-237-2605 |
| CITVA | Citizens Telephone Cooperative | Facility | A | VA | 540-745-2115 |
| CITY2 | City Communications Inc. | CLEC Facility | A | AL | CA | FL | GA | IN | KY | LA | MI | MS | NC | OH | SC | TN | TX | WI | 678-698-7475 |
| CITZ | Citizens Telephone Company | ILEC VoIP Provider | NC | 803-326-7370 | |
| CITZN | Citizens Telephone Co. of Kecksburg | CLEC Facility ILEC VoIP Provider | A | PA | 888-819-6170 |
| CIVIC | City of Sturgis - CANCELLED | VoIP | C | MI | 269-506-3003 |
| CL1LA | MTPCS LLC - CANCELLED | Wireless/Cellular/PCS | C | LA | 866-408-6333 |