Unified messaging (or UM) is the integration of different electronic messaging and communications media (e-mail, SMS, fax, voicemail video messaging, etc.) technologies into a single interface, accessible from a variety of different devices. While traditional communication systems delivered messages into several different types of stores such as voicemail systems, e-mail servers, and stand-alone fax machines, with Unified Messaging all types of messages are stored in one system. Voicemail messages, for example, can be delivered directly into the user’s inbox and played either through a headset or the computer’s speaker. This simplifies the user’s experience (only one place to check for messages) and can offer new options for the workflow such as appending notes or documents to forwarded voicemails.
A VoIP Phone System / IP PBX system consists of one or more SIP phones / VoIP phones, an IP PBX server and optionally includes a VoIP Gateway. The IP PBX server is similar to a proxy server: SIP clients, being either soft phones or hardware based phones, register with the IP PBX server, and when they wish to make a call they ask the IP PBX to establish the connection. The IP PBX has a directory of all phones/users and their corresponding IP address and thus is able to connect an internal call or route an external call via either a VoIP gateway or a VoIP service provider to the desired
destination. When the main system is located not at customer promises – this service called “Managed Services” or “Hosted PBX Solutions”. The quality and reliability of your network is your internet connection/internet provider you have.