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Below is a list of the voting member companies of PRQC:
| Alcatel USA Inc. |
| ASTRI |
| AT&T |
| BellSouth Telecommunications |
| C.S.I. Telecommunications |
| Cingular Wireless LLC |
| Defense Info. Systems Agency |
| Ericsson Incorporated |
| Harris Corporation |
| Intelsat |
| Lucent Technologies |
| National Communications System |
| Natl Telecom & Info Admin-NTIA |
| Nortel Networks |
| Qwest |
| SBC Communications, Inc. |
| Siemens Info & Comm Ntwks, Inc |
| Sprint Corporation |
| Telcordia Technologies |
| Tellabs Operations, Inc. |
| Verizon Communications |
Below is a list of the observer member companies of PRQC:
| Acterna |
| Beatnik, Inc. |
| Cisco Systems |
| ECI Telecom Incorporated |
| France Telecom R&D |
| Hewlett-Packard |
| Mangrove Systems, Inc. |
| MCI |
| Microcell Solutions Inc. |
| Polycom Inc. |
| Symmetricom Inc. |
| Tekelec Inc. |
| T-Mobile USA Inc. |
| TrellisWare Technologies, Inc. |
