| Business | Phone |
| 1 Nation Technology West 7100 Broadway # 6j, Denver 80221 | (303) 487-7300 |
| Access Lan 4643 S Ulster St, Denver 80237 | (303) 226-4440 |
| Advantis 3515 S Tamarac Dr, Denver 80237 | (303) 785-2885 |
| Am Comm Technologies 7100 Broadway, Denver 80221 | (303) 650-8242 |
| B T Communications 2681 W 64th Ave, Denver 80221 | (303) 289-9941 |
| Advanced Communication Experts Denver 80202 | (720) 274-2693 |
| Altigen Cti Communications 600 17th St, Denver 80202 | (303) 285-0210 |
| Dakota Telephone & Wiring Denver 80234 | (720) 887-8487 |
| Fax-Tel 11280 Fairfax Ct, Denver 80233 | (303) 451-8043 |
| Flexcom Inc Communication 9025 E Kenyon Ave # 312, Denver 80237 | (303) 889-5985 |
| Iloka Inc 4643 S Ulster St # 1200, Denver 80237 | (303) 373-4444 |
| Imagine Technologies 4601 Dtc Blvd, Denver 80237 | (720) 200-6700 |
| Innovative Net Results 1870 W 64th Ln # E, Denver 80221 | (303) 451-9441 |
| Iptimze Inc 4949 S Syracuse St # 450, Denver 80237 | (303) 268-3600 |
| Business Solutions Inc 4910 Fox St # G, Denver 80216 | (303) 285-1111 |
| Business Teleconsultants Ltd 160 Ivy St, Denver 80220 | (720) 941-0474 |
| Carpender Design Audio 8200 E Pacific Pl # 202, Denver 80231 | (303) 283-8100 |
| Phone Supplements Inc Denver 80237 | (303) 770-8822 |
| Chatter Box Inc 6311 Washington St # C, Denver 80216 | (303) 289-6069 |
| Pyramid Communications Svc Inc 7100 Broadway # 3g, Denver 80221 | (720) 540-5622 |
| Com Tel Communications Denver 80231 | (303) 695-6087 |
| Conley Equipment 3751 Revere St, Denver 80239 | (303) 371-6777 |
| Cti Communications Llc 600 17th St, Denver 80202 | (303) 285-0211 |
| Cti Inc 16319 E Tennessee, Denver 80224 | (303) 324-0332 |
| Data Tech 1990 S Zenobia St, Denver 80219 | (303) 936-8215 |
| Denver Phone Co 901 Auraria Pkwy # 300, Denver 80204 | (303) 571-1055 |
| Denver Telephone Co 2301 S Downing St, Denver 80210 | (303) 238-4747 |
| Tri-Tel Communications Inc 6401 Broadway # F, Denver 80221 | (303) 429-1920 |
| Universal Access Inc 4600 S Syracuse St # 900, Denver 80237 | (303) 785-2702 |
| Fountainhead Networks Inc 1234 E Colfax Ave # 201, Denver 80218 | (303) 756-1880 |
| Vitel Technologies Denver 80202 | (303) 788-0887 |
| Vodaci Technologies Denver 80206 | (303) 355-2330 |
| Icon Solutions Inc 200 Fillmore St, Denver 80206 | (303) 355-4266 |
| Idea! Communications Group Inc 600 17th St # 2800s, Denver 80202 | (303) 909-5314 |
| Interactive Intelligence Inc 1430 Larimer St, Denver 80202 | (720) 932-6759 |
| Time Business Systems 7003 E 47th Avenue Dr # A1100, Denver 80216 | (303) 425-6300 |
| Universal Access Inc 910 15th St, Denver 80202 | (303) 785-2700 |
| Universal Communications Intl 1200 S Ogden St, Denver 80210 | (303) 550-4548 |
| Kcg Communications 5701 E Evans Ave, Denver 80222 | (303) 773-1200 |
| Synergy Telecommunications 5403 E Evans Ave, Denver 80222 | (303) 733-4900 |
| Telnet Denver 80202 | (303) 988-5326 |
| Telwest Communications Llc Denver 80202 | (303) 592-1999 |
| Lightspeed Ip Inc 1850 Bassett St, Denver 80202 | (303) 893-0840 |
| Marketrace Llc 1408 Wazee St, Denver 80202 | (303) 623-4400 |
| Midwest Communications 235 W Louisiana Ave, Denver 80223 | (303) 282-7500 |
| Raycomm Business Telephone 1230 S Parker Rd, Denver 80231 | (303) 755-6500 |
| Proconnect Llc 3003 Arapahoe St # 214, Denver 80205 | (303) 363-6700 |