We have a Communication Manager cluster with almost 200 phones and 150 softphones (Jabber). All call handling is done with this solution. We have it integrated with Active Directory. This solution was added to the Unity solution for voice mail integrated with Office 365. The Expressway C & E solution was also incorporated for the registration of softphones (Jabber) from the Internet in a very simple way for end users. Finally, we have the connection to the PSTN through a gateway with SIP trunk.

Our primary use is communication between users as well as inbound and outbound calls for the organization. Also included is IM & Presence for the users.