The communication industry has created a pile of trendy concepts that are easy to mix:
IP voice(VoIP): Transfers telephone calls over IP data networks;
IP phone number:VoIP+Traditional PBX functions such as billing and dialing scheme, teleconference, call transfer, forward call transfer, and call persistence;
IP communication:IP phone number+Enhance commercial applications of communications, such as unified messaging;
Integrated Communication:Technology-oriented interconnection and convergence at the network layer, unified protocols are achieved through various gateways, and various terminals based on different protocols can communicate with each other;
Unified message: Integrate various communication methods (fax, voice, short message, Im, and email) on the same platform...Real-time communication systems that intelligently manage, convert, distribute, and store various types of information. Users can access these different types of messages through a unified interface;
Unified Communication:Further development of integrated communication and unified messaging concepts; focus on people-oriented application layer integration; all businesses can be implemented on the same terminal and interface; Core Protocol is sip
Refer:
[1] A rough road to Unified Communication past and present http://network.pconline.com.cn/skills/0808/1396919.html
[2]Unified messaging and communication http://www.ctiforum.com in a module Network/
[3]Unified Messaging solution http://uc.microvoip.com