If you want to use Voice over IP (VoIP) to provide telephone service for your organization, Microsoft's software-powered VoIP solution, Enterprise Voice, can provide it without requiring major changes to your existing telephone system. Together with instant messaging (IM), conferencing, audio/video (A/V) features, and full integration with Outlook and Microsoft Exchange Unified Messaging, Enterprise Voice enables Office Communications Server users to communicate with colleagues throughout the enterprise by a variety of means, and it makes the transition to VoIP easier and more cost efficient by enabling you to use existing routers, gateways, PBXs, and telephones that are compatible with Office Communications Server.
Enterprise Voice enables users to:
- Place calls from their computers by clicking a contact in
Outlook or Office Communicator.
- Place calls over the IP network from computer to computer,
computer to telephone, or telephone to computer. Users benefit from
having all of their communications options—voice, e-mail, IM, and
conferencing—available and integrated on their computers.
- Have incoming calls ring simultaneously on all of their
communications devices—desktop and laptop computers, and wired and
mobile phones—enabling them to answer wherever they have an
Internet connection and on whichever device is most convenient.
- Place and receive calls that traverse network address
translations (NATs) and firewalls. This means that users working at
home or on the road can call the enterprise from anywhere an
Internet connection is available without incurring long-distance
charges or resorting to a virtual private network (VPN), and that
users within the enterprise can make calls that reach beyond the
- Place, answer, and forward calls, and use other call-control
features with which they are familiar, with little training or
changes to dialing habits.
- Retain existing telephone numbers.
In addition to productivity enhancements for users, Enterprise Voice provides the following benefits for the enterprise:
- Enterprise Voice can be deployed with only modest modifications
to existing Communications Server 2007 and telephony
- Communications Server 2007 R2 uses smart, least-cost routing
algorithms for calls to the public switched telephone network
- Enterprise Voice features centralized administration using
familiar software tools for management.
- Enterprise Voice supports integration with existing PBX and
remote call control (RCC) solutions.
- Enterprise Voice has a distributed architecture that reduces
bottlenecks and the likelihood of single points of failure.
- Enterprise Voice can integrate with Exchange Unified Messaging
to provide voice mail, voice messaging, e-mail messaging, call
answering, subscriber access, call notification, and auto attendant
services. (Implementing these services requires integrating
Exchange Unified Messaging and Office Communications Server in a
shared Active Directory topology.)
- SIP trunking enables an enterprise to connect its on-premises
voice network to a service provider who offers PSTN origination,
termination, and emergency services by making use of the SIP
protocol. The benefit is reduced costs in deploying voice by using
an industry-standard voice protocol (SIP) for PSTN access rather
than deploying IP-PSTN gateways within the enterprise network,
where these gateways terminate legacy PSTN protocols such as ISDN
- Office Communications Server 2007 R2 Attendant enables
high-volume call handling from a receptionist’s computer, with
advanced features such as consultative transfers by phone or IM,
transfers with notes, and availability checking. It is intended
primarily for users who must manage multiple calls at once,
including receptionists and administrative assistants.