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But what if the call control function could be separated from the rest of the iron What if the call control function for the entire network could be placed in the core of the network, and smaller, cheaper systems providing nothing more than the switching fabric were deployed at the network edges where service access needs to be This is exactly the case with VoIP networks. The switching fabric is a cheaper system that is placed at the network edges for access, under the control of a centralized call controller. The switching matrix is the media gateway (MG), while the control function is the media gateway control function (MGCF). This is shown in Figure 1-3. The signaling function is inherent in the MGCF, but there still needs to be a gateway function between the legacy SS7 network and the VoIP network, so this is provided by the signaling gateway (SG) (not shown in Figure 1-3). The SG interfaces to the SS7 network using SIGTRAN signaling links (IP-based facilities). In Figure 1-3 notice the MGCF functions also connect into the same IP network as the MG. The voice and data from various devices all use the same IP network. While the IP network is usually depicted as a cloud, Figure 1-3 illustrates that in fact within the cloud there are routers that are interconnected to other routers. This is not much different than the switched network, except that the circuits are not dedicated to single transmissions in the IP network.
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Signaling Voice Figure 1-3 A typical VoIP network
Architecture of a SIP Network
So now that you understand the fundamental differences between the various networks, and how databases are used throughout the network for the delivery of common voice services, let s look at each of the SIP network entities specifically and the functions they provide.
Media Gateway (MG)
The media gateway (MG) connects the various end points together. In other words, it is the MG that connects a voice facility to the network at the network edges. For example, the MG connects the various circuits out to the customer premises, and converts the payload from these circuits to packet. Think of the MG as the packetizer of the VoIP network. Its job is to take the nonpacket circuits, and their payload, and convert them to packet format for transport through the IP network. This means that the other side of the MG supports IP. This makes the MG rather complex in some terms, since it must support the codecs necessary for converting packetized voice back into audible form for transmission over the voice circuit, and vice versa. The MG is the equivalent to the switching fabric in the telecom switch. It provides the matrix, if you will, for connecting TDM circuits to packet circuits, and then routing them over the packet network. There will be many TDM circuits connecting to the same packet circuit, however, which is very different from the voice switch. The MG also provides multimedia connectivity in an all-IP environment. For example, in Figure 1-4 you see how the MG connects via IP to multiple device types at the
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Figure 1-4
MG role in the VoIP architecture
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subscriber premises and provides connectivity back into the core network via IP. Note also that the MG connects to the media gateway control function (MGCF). This is where the call control is, communicating with the MG using the SIP protocol. Other call control protocols could be supported, depending on the implementation, but given our focus in this book is SIP, we will pretend there are no others. SIP in these examples is the call/session control for the entire network.
Media Gateway Control Function (MGCF)
The media gateway control function (MGCF) is the most important entity in the whole network, for it is here that all the decisions are made regarding the management of a call. This is the brains of the network, the equivalent to the call control function in the voice switch. The MGCF determines how a call is to be routed through the network based on signaling from the MG. The MG is responsible for the actual connections, while the MGCF manages the resources of the MG. This means determining what codecs are needed for the session, and signaling to the destination MGCF/MG regarding the session. The MGCF generates the requests/responses in the SIP network. The MG originates connections and notifies the MGCF using either SIP or some other signaling protocol such as the Media Gateway Control Protocol (MGCP), or H.323. The MGCP also possesses a SIP URI address for routing purposes. While the MGCF does initiate requests and responses, the MGCF does not register in the network. Its purpose is that of stateful proxy within the SIP domain. The MGCF communicates with other MGCFs within its own network, but it interfaces with the breakout gateway control function (BGCF) when interfacing to other networks. The BGCF acts as a network gateway and can also be implemented as the gateway into the PSTN if the PSTN is another domain (otherwise, the MGCF traditionally provides this interface).
Signaling Gateway (SG)
The signaling gateway (SG) interfaces between the SS7 network and the SIP network. It can also interface to other non-SIP VoIP networks such as H.323 or MEGACO. The signaling gateway provides an SS7 ISUP interface into the VoIP network by transporting ISUP over an IP facility. The transport protocol used at the signaling gateway is SIGTRAN. The signaling gateway uses traditional SS7 interfaces (using the Message Transfer Part, or MTP, for transport) within the SS7 domain, then SIGTRAN into the SIP domain. Many BGCF/MGCFs support ISUP as well as SIP, providing the necessary gateway function. The signaling gateway is not a SIP entity per se, since it typically does not support SIP. Its primary purpose is to provide an IP interface for ISUP into the VoIP network. The signaling gateway provides an important function when implementing a SIP network.
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