| Business | Phone |
| Nikos Wireless 1343 N Ashland Ave, Chicago 60622 | (773) 227-6855 |
| Calliope Inc 225 N Michigan Ave 902, Chicago 60601 | (312) 938-3656 |
| Mfs Telecom 130 E Randolph St, Chicago 60601 | (312) 946-0060 |
| Telephone & Data Systems Inc 30 N Lasalle St, Chicago 60602 | (312) 630-1900 |
| Shared Technologies Fairchild 10 S La Salle St 305, Chicago 60603 | (312) 419-2750 |
| Telecom Management Systems 401 S La Salle St, Chicago 60605 | (312) 786-5900 |
| Nortel Networks 30 S Wacker Dr 3903, Chicago 60606 | (847) 706-8400 |
| Parallel Partners Inc 20 N Wacker Dr 3019, Chicago 60606 | (312) 251-1865 |
| Staffing Now 125 S Wacker Dr, Chicago 60606 | (312) 214-7135 |
| Tmi 225 W Wacker Dr 1050, Chicago 60606 | (312) 920-7000 |
| Usn Communications Inc 10 S Riverside Plz 2000, Chicago 60606 | (312) 906-3600 |
| Medical Communication Mgmt Inc 401 E Illinois St, Chicago 60611 | (312) 836-4240 |
| New Communication National 4408 N Kedzie Ave, Chicago 60625 | (773) 539-6960 |
| Pace Telecommunications Inc 3333 E 143rd St, Chicago 60633 | (708) 862-2200 |
| Level 3 Communications 180 N Stetson Ave, Chicago 60601 | (312) 819-0290 |
| Mfs Telecom 180 N Stetson Ave, Chicago 60601 | (312) 803-2000 |
| Monitor Group 111 E Wacker Dr 300, Chicago 60601 | (312) 938-1849 |
| Rolm Iii 150 N Michigan Ave, Chicago 60601 | (312) 332-7656 |
| Talk America Inc 205 N Michigan Ave 4201, Chicago 60601 | (312) 729-1286 |
| Verizon 205 N Michigan Ave 1100, Chicago 60601 | (312) 470-2121 |
| Hostway Corp 1 N State St 1200, Chicago 60602 | (312) 346-0072 |
| Orlando Jones & Assoc 33 N La Salle St, Chicago 60602 | (312) 223-9595 |
| Tekom Communications Inc 120 N La Salle St 1250, Chicago 60602 | (312) 920-0968 |
| Telecom Affiliates Inc Chicago 60604 | (312) 322-0700 |
| Palmen & Assoc 1322 S Prairie Ave, Chicago 60605 | (312) 945-3300 |
| Qwest Solutions Ctr 520 S Federal St, Chicago 60605 | (312) 922-7386 |
| Cypress Communications 227 W Monroe St, Chicago 60606 | (312) 332-0752 |
| Gtcr Golder Rauner 233 S Wacker Dr 6100, Chicago 60606 | (312) 382-2200 |
| Level 3 Communications 111 N Canal St 200, Chicago 60606 | (312) 895-2900 |
| Mci 10 S Canal St, Chicago 60606 | (312) 441-1943 |
| Qwest Solutions Ctr 1 N Franklin St 2600, Chicago 60606 | (312) 201-9071 |
| Qwest Solutions Ctr 216 W Jackson Blvd, Chicago 60606 | (312) 372-4409 |
| Qwest Solutions Ctr 311 W Washington St, Chicago 60606 | (312) 782-2981 |
| Winstar Telecommunications Ort 101 N Wacker Dr, Chicago 60606 | (630) 435-0138 |
| Infolink Communications Ltd 1052 W Fulton Market 3e, Chicago 60607 | (312) 226-7400 |
| Layer One Holdings Inc 717 S Wells St 750, Chicago 60607 | (312) 588-1564 |
| Mci 1340 W Monroe St, Chicago 60607 | (312) 243-6107 |
| Mfs Intelenet 800 S Wells St, Chicago 60607 | (312) 803-7700 |
| Rhs Telecom 750 N Orleans St, Chicago 60610 | (312) 698-7020 |
| Ulticom Inc 400 W Erie St 401, Chicago 60610 | (312) 255-9030 |
| General Telecommunications 500 N Michigan Ave, Chicago 60611 | (312) 644-1995 |
| Information Technology Library 50 E Huron St, Chicago 60611 | (312) 944-6780 |
| Prism Business Media 330 N Wabash Ave 2300, Chicago 60611 | (312) 321-0094 |
| Spectra Corp 655 W Irving Park Rd, Chicago 60613 | (815) 464-5248 |
| Synapse 612 W Deming Pl, Chicago 60614 | (773) 871-1466 |
| Singapore Telecom Usa Inc Chicago 60616 | (312) 842-4984 |
| T R Communications Llc 3029 E 91st St, Chicago 60617 | (773) 933-6001 |
| Personal Telephone Comm 3105 N Milwaukee Ave M, Chicago 60618 | (773) 774-7000 |
| Web Predictive Dialer 2140 W Fletcher St, Chicago 60618 | (773) 477-3425 |
| N-All-Connections 913 W 59th St, Chicago 60621 | (773) 892-0703 |
| Spectrasite Communications 1416 W Huron St, Chicago 60622 | (312) 432-1050 |
| Multiple Wireless Solutions 819 N Milwaukee Ave, Chicago 60622 | (312) 413-9900 |
| Nrc Telecom 1649 N Paulina St, Chicago 60622 | (773) 394-8529 |
| N S Communications Llc 2334 W Lawrence Ave, Chicago 60625 | (773) 828-8290 |
| I Q Telecom Home Phone Svc 12301 S Halsted St, Chicago 60628 | (773) 568-5758 |
| Prompt Tel Communications Inc 11700 S Michigan Ave, Chicago 60628 | (773) 468-2915 |
| Ria Telecommunications 4212 W Lawrence Ave, Chicago 60630 | (773) 427-8482 |
| Di Miagio Telecommunications 6010 N Northwest Hwy, Chicago 60631 | (847) 843-8000 |
| Inter Call Inc 8420 W Bryn Mawr Ave 400, Chicago 60631 | (773) 399-1600 |
| Verizon 8750 W Bryn Mawr Ave 501, Chicago 60631 | (773) 399-1700 |
| Mci 6001 N Northwest Hwy, Chicago 60631 | (773) 763-5724 |
| Ntt America Inc 8600 W Bryn Mawr Ave 750, Chicago 60631 | (773) 693-0080 |
| Poltel 7047 W Belmont Ave, Chicago 60634 | (773) 385-9181 |
| Ttc Marketing Solutions 3945 N Neenah Ave, Chicago 60634 | (773) 545-0407 |
| Prompt Tel Communications Inc 5453 W North Ave, Chicago 60639 | (773) 637-8698 |
| Telelink Cards Inc 5503 N Clark St, Chicago 60640 | (773) 271-4821 |
| Nissi Telecom 4250 N Pulaski Rd, Chicago 60641 | (773) 777-9600 |
| New Millennium Telecomm 2019 W 95th St, Chicago 60643 | (773) 239-0006 |
| Raza Telecom 5420 N Harlem Ave, Chicago 60656 | (773) 631-7292 |
| American Tower Corp 500 W Monroe St, Chicago 60661 | (312) 669-9745 |
| Call One 500 W Madison St 411, Chicago 60661 | (312) 440-9440 |
| Simplecomm Solutions 125 N Halsted St 302, Chicago 60661 | (312) 715-1600 |