Avaya is the former Business Communications arm of Alcatel-Lucent. Avaya acquired NorTel recently and has integrated their product portfolio.
In the Unified Communications world, Avaya is at the forefront of the Gartner Magic Quadrant for Telecom. It is one of the largest companies doing business in the field today. Avaya has recently expanded into the data switching world but their core focus is Unified Communications.
To support their Unified Communications Platform, Avaya has two core product suites: IP Office and Aura (formerly Communication Manager).
The IP Office system is geared towards small to medium business. Designed from the ground up to work for the SMB market segment, the IP Office is a modular system which is feature-key enabled to handle anywhere from a five person office to a small distributed Enterprise. The IP Office is best suited for call centers under 300 persons, and Enterprises without a single campus exceeding 300 users (the actual cap is 384, but when you’re getting near that number it’s time to move up to Aura). The IP Office supports analog, digital and IP Endpoints along with NorTel Hardware.
Aura is for Enterprise. It’s the flagship Avaya product and like the IP Office, it’s modular. This is a big differentiator when compared to the unnecessarily custom installations a lot of other manufacturers provide, but it is important to understand the scope of the project before installation to accurately gauge budgeting. It’s a great distributed call center system with automatic failover for Business Continuity. Avaya is certainly not the cheapest product on the market, but it is one of the most well known and it is one of the most highly regarded in the space.
Overall, Avaya is a proven industry veteran with a lot of high profile installations with some of the largest enterprises in the World. They have a small direct sales channel and a huge reseller network.