Akoito2021
MIS
Hi, please if you can help me, im kinda new in this system upgrade, we are currently using ver 9.1 but unfortunately we are not allowed to add more extension because avaya stop offering new licenses. Told is need to upgrade first. If we are going to upgrade meaning all are existing avaya extension phones need to be change also? And for the server upgrade the system or even the hardware? Thank you in advance for your help.