Avaya training and other documents: https://www.societysource.org/sites/search/Pages/results.aspx?k=avaya
To setup voicemail delivery to your email: https://www.societysource.org/Resource_Center/Avaya%20Voicemail%20to%20Email%20Setup%20Instructions.pdf
For all other Avaya issues, please use LIVE CHAT.
After hours, you may submit an Online Ticket
For more information on the Skype for Business - Phone Solution (Skype PBX).