Telephone Equipment & Systems; Telephone Equipment Systems-Repairs & Service; Telephone Companies; Telecommunication Services; Telecom Source, Inc. buys and sells used, new & refurbished business telephone systems, phones & parts. We specialize in Nortel Norstar & Avaya, but also carry Cisco, Polycom & Multi-Link products. Telecom Source, Inc offers regional installation & service of most major brands of business telephone systems. We also provide tech support on al Nortel BCM systems as well as Norstar legacy systems.