All Avayas struggles can be attributed to disastrous leadership and without doubt over the past 10 years the bullying culture that senior leadership has cultivated. There hasn't been and isn't anyone in the top executive management line in the USA that you would get excited about taking into a customer and delivering an evangelical believable message. Here in the USA we have some great folks below the executive line but they have been beaten to a pulp and had the life sucked out of them which then flows down and affects the " feet on the street ". The bullying culture so rampant in Avaya International is driven out of the UAE and the cabal of inept individuals that wouldn't get a leadership role in any other big organisation. You then look at the major European leaders and it's the same again - under qualified people that you wouldn't dream of putting infront of customers and when you have no choice they promise the world deliver nothing and end up costing Avaya it's credibility and hundreds of thousands of $'s. It's a god damn shame.
An excellent point by @idb+1ifItRPC.