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Table 10-2 Functions of enhanced services architecture entities
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Function Call control function Description
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May provide connection control, translations and routing, gateway management, call control, bandwidth management, signaling, provisioning, security, and call detail record generation. May provide a conversion between circuit-switched resources (lines and trunks) and the packet network (IP and ATM), including voice compression, fax relay, echo cancellation, and digit detection. May provide a conversion between the SS7 signaling network (SS7 links) and the packet network, including protocols such as ISUP and TCAP. May provide for the execution and management of enhanced services, handling the signaling interface to a call control function. It also provides APIs for creating and deploying services. May provide for specialized media resources (IVR, conferencing, facsimile, announcements, and speech recognition) and handling the bearer interface to a media gateway function.
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Media gateway function
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Signaling gateway function
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Application server function
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Media server function
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protocols and APIs for functions such as email, instant messaging, presence, web access, and so on.
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Physical Architecture
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This section discusses two possible physical architecture models, showing how the functional architecture maps to a real physical architecture. This section is used to provide a better understanding of how the logical architecture is actually implemented. Two physical architectures are discussed: a centralized architecture and a distributed architecture. Centralized Architecture Figure 10-9 shows a centralized physical architecture. The softswitch, in this example, provides for call control, signaling, and basic application functions. The application server function in the softswitch provides for standard services, such as call waiting or calling line identity, that are not typically provided on external platforms. The media gateway provides an interface to circuit-switched networks. The
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Features and Applications: It s the Infrastructure, Stupid!
Figure 10-9 A centralized architecture for enhanced services (Source: International Softswitch Consortium) Application Server
Application Server Function Application Server Function
10
Softswitch
Application Server Function
Call Control Function
Media Server
Media Server Function
Media Gateway
Media Gateway Function
application server and media server map directly from the functional architecture. The softswitch can communicate with other application servers and softswitches using SIP. Distributed Architecture Figure 10-10 shows a distributed physical architecture. The mediation gateway functions as a protocol converter between circuit-switched and packet networks, providing media gateway, signaling gateway, and basic call control functions. Functionality-wise, an IP phone or customer premise gateway is identical to a large-scale gateway. Both use SIP as the interface with other call control and service entities. In this architecture, a feature server is used to provide service-level routing between call control entities and service entities. The application server in this example can provide services based on the signaling path, while the media server can provide media-based services. All entities in this architecture communicate via SIP, providing a common peer-to-peer interface.
Interface Between Call Control and Application Servers
SIP is used as the interface between call control entities (softswitch) and application servers because of its general acceptance, availability, and capa-
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Features and Applications: It s the Infrastructure, Stupid!
Features and Applications: It s the Infrastructure, Stupid!
Figure 10-10 A distributed physical architecture for enhanced services (Source: International Softswitch Consortium)
Application Server
Application Server Function
Media Server
Media Server Function Application Server Function
Feature Server
Application Server Function
IP Phone
Media Gateway Function Call Control Function Media Gateway Function
Mediation Switch
Call Control Function Signaling Gateway Function
bility to set up, tear down, and manage sessions between end-points. In this context, a call control entity has the capability to set up and take down a call-signaling path to an application server, and for an application server to set up and take down a call-signaling path to a call control entity. It also includes the capability to convey calling and called party information, hold and resume connections, transfer sessions, and establish multiparty connections. SIP is used only for signaling; RTP is used to carry the media. SIP relays the information necessary to establish RTP communication between end-points. When used in conjunction with a media server, an application server can provide a rich set of enhanced services. The service logic in the application server has access to all call events via SIP signaling. An application server interacts with a media server for access to the media stream to detect DTMF digits, play and record media, mix media, detect and relay fax transmissions, play announcements and tones, and perform speech recognition. This multimedia access provides support for complex services such as unified messaging, conferencing, calling/debit card, and call-center-type applications.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Features and Applications: It s the Infrastructure, Stupid!
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