one-X Portal for IP Office supports Exchange server to obtain the presence status of users.

Supported Microsoft Exchange Servers
Connection to the following Microsoft Exchange servers is supported for presence integration:

Exchange 2016

IP Address of the Microsoft Exchange server.

User Account:
A user account (AvayaAdmin) is created and given rights to mine the details of the users configured on the Exchange server.

TCP/IP Port:
The default port is 6669.

Firewall Exceptions
If the Exchange server is hosted by a service provider and it outside the internal network, then port 6669 has to be opened on the router or firewall to allow inbound traffic from the Exchange server to the one-X Portal for IP Office server.