Avaya doesn't typically do these types of changes unless you're a named account and you spend big bucks annually. But if that was the case, then you would already be engaged with them.
Best bet is to contact a BP, but I'm sure you'll still find rates in the ballpark between $175-$350 an hour based on the scope and time-frame...
Thanks,
98C
We are what we repeatedly do. Excellence, then, is not an act but a habit. ARISTOTLE 384-322 B.C.