Ocs r2 enterprise telephony integration

Table of Contents
Introduction 5
Microsoft and Telephony Partners 6
Intermediation of Telephony 7
Overview of Telephony Integration 10
Architectural Overview 10
Voice Functionality 11
The Office Communications Server Difference 13
Office Communications Server Deployment Scenarios 14
Office Communications Server Stand-Alone 14
Office Communications Server Co-existence Scenario 15Partner Ecosystem 17
Media Gateways 17
PBXs 17
SIP Trunking 17
Media Gateway Integration 18
Basic Media Gateways 18
Hybrid Basic Media Gateways 19
Integrated Media Gateways 19
PBX Integration 20
UC-Enabled PBX 20
UC-Capable PBX 20
Non–UC-Capable PBX 21
SIP Trunking Integration 22
SIP Trunking and Standards 23
Unsupported Scenarios 23
Branch Office Survivability 23
Hosted Telephony 23Non-Office Communicator Endpoint Support 24
UDP as a SIP Transport 24
Telephony Integration Features and Mechanisms 26
Office Communications Server 2007 Stand-Alone Telephony Integration 26
Inbound Call 26
Outbound Call 27
Call Forward and Transfer 27
Conference 28
Office Communications Server 2007 Co-existence Telephony Integration 30
Inbound Call 30
Outbound Call 30
Call Forward andTransfer 31
Conference 32
Do Not Disturb 32
Migration Paths and Integration Strategies 33
Building the Foundation 33
PBX to Office Communications Server 2007 Co-existence 33
PBX to Office Communications Server 2007 Stand-Alone 34
Office Communications Server 2007 Co-existence to Office Communications Server 2007 Stand-Alone 34
Customer Location That Has No Current Telephony Infrastructure toOffice Communications Server 2007 Stand-Alone 35
Summary and Conclusions 36
Appendix A: Office Communications Server Stand-Alone Scenario – Call Flows 37
Inbound Call 37
Outbound Call 38
Call Placed on “Hold” 39
Appendix B: Office Communications Server Co-existence Scenario – Call Flows 40
Make a Call 40
Answer a Call 41
Forward 42
Transfer 43
Conference 44
Do Not Disturb 45Glossary 46

Introduction
On October 16, 2007, Microsoft entered the emerging unified communications product space with the worldwide launch of Microsoft® Office Communications Server 2007 and Microsoft Office Communicator 2007. Combined with Microsoft Exchange Server 2007, the Microsoft unified communications platform delivers streamlined communications for enterprise users, enabling directcommunication from the applications they use most, such as Microsoft Office Outlook® messaging and collaboration client. With this release, the concepts of context-based, person-centric collaboration that shipped with Microsoft Office Live Communications Server 2005 and Microsoft Office Live Meeting 2005 were now tightly integrated with multi-modal communications using voice, video, Web conferencing, andinstant messaging (IM). Now, additional capabilities have been brought to the platform with the introduction of Microsoft Office Communications Server 2007 R2, which streamlines communications for end users, provides operational flexibility and control for IT, and offers a rich extensible development platform for integrating business processes with communications capabilities.
For more than 100years, telephony has played an increasingly important role in business communications. With the advent of mobile networks, the ability to communicate from almost any location and situation has increased the reliance of business users on telephony.
The telephony world is highly regulated, with every national government playing a role in regulation of telephony service providers, telecom devices,and, in some cases, telecom technology standards. Many different national networks operate on various dialects of telephony standards, and many countries require that vendors have their telecom products certified by the national telephony authorities. Some telephony business markets have undergone deregulation over the last 20 years, which has increased the number of vendors and service providers,...