Pros
Avaya is a great place to work. They provide a diverse range of positions suitable for almost any career point. The health care benefits are very good, including 401K and pension plans. Lots of internal training is available, including off site courses. They have always done a good job of building morale and team work through company "unwinders" and off site team building activities. Avaya is a well recognized name that delivers a solid product line. I would not hesitate to work for them again if another opportunity presented itself in the future.
Cons
Just like any large company, Avaya has always seemed to be top heavy with management. Most of the middle managers are good, but new directors come and go, each bringing their own management style, some good and some just lousy.