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A VoIP gateway is a third-party hardware device or product that converts traditional phone-system or circuit-switching protocols into data-networking or packet-switched protocols. The VoIP gateway connects a telephone network with a data network. Unified Messaging servers can connect only to packet-switched data networks. This means that organizations with a traditional PBX must deploy a VoIP gateway to communicate between the PBX and the Unified Messaging server. Table 9-1 lists the types of telephony systems and explains when a VoIP gateway is required.

A list of supported PBXs and IP gateways for Exchange 2010 Unified Messaging can be found on Microsoft TechNet in Telephony Advisor for Exchange 2010 at http://technet .microsoft.com/en-us/library/ee364753.aspx.

There are a number of voice-related, IP-based protocols. A Unified Messaging environment with Exchange Server 2010 uses the following:

protected virtual void Initialize(RequestContext requestContext) { this.ControllerContext = new ControllerContext(requestContext, this); }

Session Initiation Protocol (SIP) SIP is a real-time signaling protocol that creates,

manipulates, and disconnects interactive communication sessions on an IP network. The UM role uses SIP mapped over Transmission Control Protocol (TCP) and supports TLS for secured SIP environments. SIP clients, such as IP/VoIP gateways and IP/PBXs, can use TCP port 5060 or port 5061 (for Secure SIP) to connect to UM server roles. You can find more information about the SIP protocol at http://tools.ietf.org/html/rfc3261.

IP gateway and the Unified Messaging server. RTP provides high-quality, real-time, streaming voice delivery. One of the issues with sending voice messages over an IP network is that voice requires real-time transport with specific quality requirements to ensure that the voice sounds normal. If the protocol uses large packets, listeners must wait for the entire packet to arrive before they can respond. Any delay in packet delivery can produce undesirable periods of midstream silence. Packet loss can cause voice garbling. You can get more information about the RTP protocol at http://tools .ietf.org/html/rfc3550.

All it consists of is the instantiation of the ControllerContext property. The ControllerContext type encapsulates information about the ongoing HTTP request and the controller. Even though ControllerContext doesn t have any parent class, it can be considered an extension of RequestContext that just adds a reference to the controller object in addition to route data and HTTP context.

The Unified Messaging server role includes connections to different components, such as the Client Access or Mailbox server roles, and also to IP PBX or IP gateways, as shown in Figure 9-1. Generally, the UM server role communicates to an IP PBX or to a PBX using an IP gateway with the Voice over IP protocols (VoIP), Session Initiation Protocol (SIP), and Real-time Transport Protocol (RTP). The UM server role uses MAPI protocol to communicate with Client Access and Mailbox server roles, and SMTP protocol to send voice mail messages to the destination mailbox via

2: Operators 3: User-Defined Functions 3.1 Vertex Shader Semantics 3.2 Pixel Shader Semantics 3.3 Procedural Texture Shader Semantics 4: Intrinsic Functions 5: Pixel Shader 1_x Considerations 5.1 ps_1_1, ps_1_2, and ps_1_3 5.2 ps_1_4 5.3 Modifiers 5.4 Texture Instructions 6: Keywords 7: Directives 8: Lexical Conventions 8.1 White Space 8.2 Floating-Point Numbers 8.3 Integer Numbers 8.4 Characters 8.5 Identifiers 8.6 Strings 9: Grammar 9.1 Program 9.2 Declarations 9.3 Usages 9.4 Types 9.5 Structures 9.6 Annotations 9.7 Variables 9.8 Initializers 9.9 Functions 9.10 Techniques 9.11 Statements 9.12 Expressions 9.13 Tokens