Center for Satellite and Hybrid Communication Networks (CSHCN)
Investigate interoperable hybrid networks that seamlessly link new satellite and wireless systems with cellular, cable, Internet and telephone networks schematic. Includes research information, and staff profiles .
http://www.isr.umd.edu/CSHCN/

PC-Telephone
Free pc-to-pc, cheap pc-to-phone, pc-to-fax, phone-to-pc calls over Internet, LAN or ISDN/PSTN telephone networks. Use your PC as internet telephone, ISDN phone, USB phone, USB handset, answer phone, fax and voicemail for pc-pc, pc-phone, pc-fax, phone-pc calls.
http://www.pc-telephone.com

TeleWall Telecommunications Firewall
Helps secure telephone networks against abusive or unauthorized access and usage. Detects, logs, and controls all inbound and outbound telecom network activity based on user defined, automated security policies, protecting enterprise data networks from back-door modem access and other external attacks through the Public Switched Telephone Network working in conjunction with conventional data firewalls to secure the electronic perimeter.
http://www.securelogix.com/products/etm_overview.htm/telewall.htm

ACE*COMM Corporation
ACE*COMM Corporation. OSS solutions for mediation, revenue assurance, next-generation service delivery, and billing to operators, service providers, and enterprises worldwide.
http://www.acecomm.com/

ICS Limited
Complete Business Communications Solutions for Voice and Data,
http://www.icstele.com/

Salient Networks
Description
http://www.salientnetworks.com/

DnR Communications
DnR Communications - COMMITTED TO EXCELLENCE
http://www.dnrcomm.com/

Telecom-West
As a Premier Partner of Nortel Networks, and choosing to exclusively Sell, Service, and Support only Nortel Networks Meridian 1 telephone systems, Telecom-West is able to offer only the highest quality corporate communications.
http://www.telecom-west.com/

SST.
Specialists in connectivity solutions for industrial networks including DeviceNet, ControlNet, Ethernet/IP, Profibus, ASi, Interbus, Modicon Networks, Allen-Bradley networks, Reliance networks and others.
http://www.mySST.com

PFP
Provides phone, computer and cable services. Configures, installs and services telephone, voicemail, computer systems and networks in Massachusetts and New England. Comdial, Avaya, Nortel and others.
http://www.netway.com/~pfp/