If you worked with Avaya for 10 years you don't have minimal experience. You just have different experience than Cisco or Skype.
You have more experience with Avaya than most of my colleagues because the company came to Avaya when the Nortel stuff got snatched.
That is still experience in the phone world and if you didn't only install 4 phone systems with embedded voicemail the entire time then you can show that off to any other vendor and they know that you can learn your stuff no matter what it may be.
SIP trunks are all the same (more or less)
Wear the Avaya experience proud without being too cocky then you will have no issues I bet finding a new job with another vendors BP.
Joe W.
FHandw, ACSS (SME)
"This is the end of the world, make sure to buy your T-shirt before it is too late"
Original expression of my daughter