Introducing the VoIP Softswitch
Many companies looking to upgrade their phone systems may not be aware of the benefits a VoIP softswitch can offer. What is a VoIP softswitch? The biggest difference between traditional phone systems and a VoIP softswitch lies in hardware vs. software. A VoIP softswitch is a software-driven phone system.
In the past, phone systems used physical switchboards to route calls; the VoIP softswitch offers a different delivery method. With a VoIP softswitch, software is used to control connections at the point where circuit networks and packet networks meet.
Today, a single device—coupled with VoIP softswitch software—can be used to handle both switching logic and switching fabric. These two VoIP softswitch components can be broken down as follows: a call agent to perform billing, routing and signaling functions and a media gateway to connect digital media streams (voice and data) into a single path.
For businesses, there are a number of advantages to using a VoIP softswitch. Perhaps the biggest advantage of a VoIP softswitch is cost. Being able to route calls over IP networks is cheaper than traditional telephony, and a VoIP softswitch, being software-based, is less expensive to buy and maintain.
Another advantage of a VoIP softswitch is ease of use and administration. A VoIP softswitch greatly simplifies administrative tasks associated with managing a phone system. In fact, most VoIP softswitches are so easy to maintain that IT staff can perform administration. The admin simplicity of a VoIP softswitch saves a company money it would otherwise have to spend on telephony experts.
For users, too, a VoIP softswitch offers advantages. Employees using a VoIP softswitch may be able to perform basic administrative tasks (like changing voicemail forwarding options) on their own, using a browser-based interface. A VoIP softswitch also may offers users the ability to remotely access the office phone system when traveling or working in the field.
Clearly, introduction of the VoIP softswitch is a positive event for businesses. If your company hasn’t considered picking a VoIP softswitch yet, now might be the time to do so!
Friday, May 28, 2010
5.What is softxwitch?
Softswitch (software switch) is a generic term for any open application program interface (API) software used to bridge a public switched telephone network (PSTN) and Voice over Internet Protocol (VoIP) by separating the call control functions of a phone call from the media gateway (transport layer).
As service providers move toward offering voice, video and data services on single packet-based networks, they will come to rely on softswitches to handle voice calls.
These server-based devices manage phone calls as they come in from packet access links and clear a path for them across the packet network to the destination phones.
But because most phones are still connected via the traditional public phone network, these softswitches also must be able to complete calls across circuit-switched networks. To do that, they control other network elements including media gateways and signaling gateways. Because of this function, softswitches are also referred to as media gateway controllers.
A media gateway translates traffic from, for instance, an ATM access link, to time-division multiplexer or IP that is used as the backbone of the carrier network. A signaling gateway mediates between the signaling used by access devices and signaling used across the service provider network. With a traditional phone network, this is called Signaling System 7.
The definition of softswitches varies. The International Softswitch Consortium limits the term softswitch to the media gateway controller. Some vendors include the media gateway or signaling gateway, too, as part of the softswitch itself.
To set up phone services, softswitches must tap into databases and application servers that define the services customers get. Because they do this via standard API, vendors other than the ones that make the softswitches can write the service programs.
Softswitch proponents tout this as an advantage because it means more providers can write these programs, encouraging competition that will reduce cost and promote innovation. Traditional circuit-switched voice switches include all the functions of a softswitch plus the service applications and databases, much of which is based on proprietary software. So service providers are locked in to one vendor.
Softswitches are also less expensive than traditional voice switches and let service providers migrate away from maintaining a separate network just for voice.
As service providers move toward offering voice, video and data services on single packet-based networks, they will come to rely on softswitches to handle voice calls.
These server-based devices manage phone calls as they come in from packet access links and clear a path for them across the packet network to the destination phones.
But because most phones are still connected via the traditional public phone network, these softswitches also must be able to complete calls across circuit-switched networks. To do that, they control other network elements including media gateways and signaling gateways. Because of this function, softswitches are also referred to as media gateway controllers.
A media gateway translates traffic from, for instance, an ATM access link, to time-division multiplexer or IP that is used as the backbone of the carrier network. A signaling gateway mediates between the signaling used by access devices and signaling used across the service provider network. With a traditional phone network, this is called Signaling System 7.
The definition of softswitches varies. The International Softswitch Consortium limits the term softswitch to the media gateway controller. Some vendors include the media gateway or signaling gateway, too, as part of the softswitch itself.
To set up phone services, softswitches must tap into databases and application servers that define the services customers get. Because they do this via standard API, vendors other than the ones that make the softswitches can write the service programs.
Softswitch proponents tout this as an advantage because it means more providers can write these programs, encouraging competition that will reduce cost and promote innovation. Traditional circuit-switched voice switches include all the functions of a softswitch plus the service applications and databases, much of which is based on proprietary software. So service providers are locked in to one vendor.
Softswitches are also less expensive than traditional voice switches and let service providers migrate away from maintaining a separate network just for voice.
4.What is softswitch?
• The advantages of the Softswitch vs. the traditional circuit switch are:
• New services and revenue stream for service providers
• Flexibility in deployment and operation
• Unified messaging
• Easy integration of dissimilar networks and components
• Lower cost of solution deployment and total ownership
Softswitch technology enables connectivity between the Internet, wireless networks, cable networks and traditional wireline telephony network, which results a converged network.
Related Terms: Packet Switching, Network Switch, PSTN, Class 5 Switch, Class 4 Switch, Call Agent, Media Gateway Controller
3.What is softswitch?
A softswitch is a central device in a telecommunications network which connects telephone calls from one phone line to another, entirely by means of software running on a computer system. This work was formerly carried out by hardware, with physical switchboards to route the calls.
A softswitch is typically used to control connections at the junction point between circuit and packet networks. A single device containing both the switching logic and the switching fabric can be used for this purpose; however, modern technology has led to a preference for decomposing this device into a Call Agent and a Media Gateway.
The Call Agent takes care of functions including billing, call routing, signalling, call services and so on and is the 'brains' of the outfit. A Call Agent may control several different Media Gateways in geographically dispersed areas over a TCP/IP link.
The Media Gateway connects different types of digital media stream together to create an end-to-end path for the media (voice and data) in the call. It may have interfaces to connect to traditional PSTN networks like DS1 or DS3 ports (E1 or STM1 in the case of non-US networks), it may have interfaces to connect to ATM and IP networks and in the modern system will have Ethernet interfaces to connect VoIP calls. The call agent will instruct the media gateway to connect media streams between these interfaces to connect the call - all transparently to the end-users.
The softswitch generally resides in a building owned by the telephone company called a central office. The central office will have telephone trunks to carry calls to other offices owned by the telecommunication company and to other telecommunication companies (aka the Public Switched Telephone Network or PSTN).
Looking towards the end users from the switch, the Media Gateway may be connected to several access devices. These access devices can range from small Analog Telephone Adaptors (ATA) which provide just one RJ11 telephone jack to an Integrated Access Device (IAD) or PBX which may provide several hundred telephone connections.
Typically the larger access devices will be located in a building owned by the telecommunication company near to the customers they serve. Each end user can be connected to the IAD by a simple pair of copper wires.
The medium sized devices and PBXs will typically be used in a business premises and the single line devices would probably be found in residential premises.
At the turn of the 21st century with IP Multimedia Subsystem or IMS), the Softswitch element is represented by the Media Gateway Controller (MGC) element, and the term "Softswitch" is rarely used in the IMS context, rather it is called AGCF (Access Gateway Control Function).
A softswitch is typically used to control connections at the junction point between circuit and packet networks. A single device containing both the switching logic and the switching fabric can be used for this purpose; however, modern technology has led to a preference for decomposing this device into a Call Agent and a Media Gateway.
The Call Agent takes care of functions including billing, call routing, signalling, call services and so on and is the 'brains' of the outfit. A Call Agent may control several different Media Gateways in geographically dispersed areas over a TCP/IP link.
The Media Gateway connects different types of digital media stream together to create an end-to-end path for the media (voice and data) in the call. It may have interfaces to connect to traditional PSTN networks like DS1 or DS3 ports (E1 or STM1 in the case of non-US networks), it may have interfaces to connect to ATM and IP networks and in the modern system will have Ethernet interfaces to connect VoIP calls. The call agent will instruct the media gateway to connect media streams between these interfaces to connect the call - all transparently to the end-users.
The softswitch generally resides in a building owned by the telephone company called a central office. The central office will have telephone trunks to carry calls to other offices owned by the telecommunication company and to other telecommunication companies (aka the Public Switched Telephone Network or PSTN).
Looking towards the end users from the switch, the Media Gateway may be connected to several access devices. These access devices can range from small Analog Telephone Adaptors (ATA) which provide just one RJ11 telephone jack to an Integrated Access Device (IAD) or PBX which may provide several hundred telephone connections.
Typically the larger access devices will be located in a building owned by the telecommunication company near to the customers they serve. Each end user can be connected to the IAD by a simple pair of copper wires.
The medium sized devices and PBXs will typically be used in a business premises and the single line devices would probably be found in residential premises.
At the turn of the 21st century with IP Multimedia Subsystem or IMS), the Softswitch element is represented by the Media Gateway Controller (MGC) element, and the term "Softswitch" is rarely used in the IMS context, rather it is called AGCF (Access Gateway Control Function).
2.What is softxswitch?
A softswitch is an API that is used to bridge a traditional PSTN and VoIP by linking PSTN to IP networks and managing traffic that contains a mixture of voice, fax, data and video. Softswitches are able to process the signaling for all types of packet protocols. Softswitch is a software
-based switching platform, which is opposed to traditional hardware-based switching center technology. Softswitches also are based on open systems, another difference between them and traditional proprietary hardware switching systems.
Softswitch is also called media gateway controller, call agent and gatekeeper.
-based switching platform, which is opposed to traditional hardware-based switching center technology. Softswitches also are based on open systems, another difference between them and traditional proprietary hardware switching systems.
Softswitch is also called media gateway controller, call agent and gatekeeper.
1.What is softxswitch?
Simply put, Softswitch is the concept of separating the network hardware from network software. In traditional circuit switched networks, hardware and software is not independent. Circuit switched networks rely on dedicated facilities for inter-connection and are designed primarily for voice communications. The more efficient packet based networks use the Internet Protocol (IP) to efficiently route voice and data over diverse routes and shared facilities.
As much an initiative as it is a concept, the International Softswitch Consortium (ISC) is leading the charge to evolve traditional networks to more efficient and feature rich softswitch networks. To date, the industry has met some success to the extent that the basic components of traditional networks have been de-coupled. The transport portion of telecommunications networks is increasing evolving to utilize the IP. In addition to data transport, this IP backbone is also increasingly the medium for Voice over IP (VoIP) services. An example of the de-coupling initiative is exemplified by special gateway and mediation equipment that is deployed to connect IP based networks to circuit based networks for VoIP.
However, Softswitch is more than simply separating the basic components. In this regard, Intelligent Networks (IN) have not yet been fully de-coupled. This current situation is disappointing to Softswitch proponents who claim that one of the primary benefits of separation of IN components would be to create an open environment for service creation. The notion is that IN would not follow traditional call control models, which are voice oriented and constraining. Instead, new control models would be session-based and support data, voice, and multimedia services equally well.
In an independent but related effort, work is underway within the Internet Engineering Task Force (IETF) to define capabilities for hybrid IN + IP networks. One such hybrid is referred to by the IETF as PINT, which stands for PSTN (Public Switched Telecommunications Network) and Internet Interworking. The motivation for PINT is to allow Internet subscribers to add traditional IN related telephony functions. The idea is to have traditional network capabilities and services accessible and useable by Internet users.
Another hybrid is the converse of PINT. SPIRIT stands for Services in the PSTN/IN Requesting Internet Services. The desire for SPIRIT is to augment IN services with IP capabilities. Therefore, the goal is to make Internet based content and applications accessible and useable by traditional network users.
The efforts of both the ISC and the IETF have the same goal in mind - establish a more distributed telecommunications architecture in which the source of functional components is completely independent. These functional components include transport, switching, network control, and service logic.
For example, one goal is to establish a "Softswitch" that does not have the hard constraints that traditional switches have, including the need for circuit based switching and transport, intelligent network triggers and mechanisms, and service logic. A completely Softswitch is one in which these functional entities reside in various distributed physical components. As we mentioned earlier, the transport function has already begun to migrate to IP based network components. However, the future benefit of Softswitch will be dictated by the extent to which network control and service logic also migrate away from the switch.
This distribution of functionality will enable the benefits of improved feature development and delivery as well as lower costs. Distributing functionality means that switches will be simpler, more efficient, and cheaper. Switches will be able to focus on switching, allowing other components to provide network control and service logic. Distributed service logic means that application development will not be constrained to centralized creation, control, and delivery of services. Instead, services can be created and deployed at various places through an extended network.
While providing the potential for many benefits, creating and deploying this model is not without its challenges. Having a vested interested in perpetuating traditional networks, some less-than-forward looking infrastructure providers are hesitant to cooperate with the Softswitch initiative. Additionally, integration of Softswitch with traditional networks will be required as Softswitch deployment will not happen everywhere all at once. A final major concern is that there will be special mediation needs between disparate networks. These needs go beyond mere protocol conversion requirements and include such things as authentication and authorization of network elements and applications. In traditional networks, well-established processes and protocols such as SS7 handle these mediation functions. These procedures will certainly be more complicated in the hybrid networks of the future.
Despite these challenges, telecommunications technology will continue to evolve for the overall benefit of society. The efforts discussed in this article will play a large role in that development. For more information about these activities see visit the ISC and IETF at www.softswitch.org and www.ietf.org respectively. Hybrid IN/IP networks and the evolution of mobile IN to become more data centric is also discussed in the book Wireless Intelligent Networking - www.mobilein.com.
As much an initiative as it is a concept, the International Softswitch Consortium (ISC) is leading the charge to evolve traditional networks to more efficient and feature rich softswitch networks. To date, the industry has met some success to the extent that the basic components of traditional networks have been de-coupled. The transport portion of telecommunications networks is increasing evolving to utilize the IP. In addition to data transport, this IP backbone is also increasingly the medium for Voice over IP (VoIP) services. An example of the de-coupling initiative is exemplified by special gateway and mediation equipment that is deployed to connect IP based networks to circuit based networks for VoIP.
However, Softswitch is more than simply separating the basic components. In this regard, Intelligent Networks (IN) have not yet been fully de-coupled. This current situation is disappointing to Softswitch proponents who claim that one of the primary benefits of separation of IN components would be to create an open environment for service creation. The notion is that IN would not follow traditional call control models, which are voice oriented and constraining. Instead, new control models would be session-based and support data, voice, and multimedia services equally well.
In an independent but related effort, work is underway within the Internet Engineering Task Force (IETF) to define capabilities for hybrid IN + IP networks. One such hybrid is referred to by the IETF as PINT, which stands for PSTN (Public Switched Telecommunications Network) and Internet Interworking. The motivation for PINT is to allow Internet subscribers to add traditional IN related telephony functions. The idea is to have traditional network capabilities and services accessible and useable by Internet users.
Another hybrid is the converse of PINT. SPIRIT stands for Services in the PSTN/IN Requesting Internet Services. The desire for SPIRIT is to augment IN services with IP capabilities. Therefore, the goal is to make Internet based content and applications accessible and useable by traditional network users.
The efforts of both the ISC and the IETF have the same goal in mind - establish a more distributed telecommunications architecture in which the source of functional components is completely independent. These functional components include transport, switching, network control, and service logic.
For example, one goal is to establish a "Softswitch" that does not have the hard constraints that traditional switches have, including the need for circuit based switching and transport, intelligent network triggers and mechanisms, and service logic. A completely Softswitch is one in which these functional entities reside in various distributed physical components. As we mentioned earlier, the transport function has already begun to migrate to IP based network components. However, the future benefit of Softswitch will be dictated by the extent to which network control and service logic also migrate away from the switch.
This distribution of functionality will enable the benefits of improved feature development and delivery as well as lower costs. Distributing functionality means that switches will be simpler, more efficient, and cheaper. Switches will be able to focus on switching, allowing other components to provide network control and service logic. Distributed service logic means that application development will not be constrained to centralized creation, control, and delivery of services. Instead, services can be created and deployed at various places through an extended network.
While providing the potential for many benefits, creating and deploying this model is not without its challenges. Having a vested interested in perpetuating traditional networks, some less-than-forward looking infrastructure providers are hesitant to cooperate with the Softswitch initiative. Additionally, integration of Softswitch with traditional networks will be required as Softswitch deployment will not happen everywhere all at once. A final major concern is that there will be special mediation needs between disparate networks. These needs go beyond mere protocol conversion requirements and include such things as authentication and authorization of network elements and applications. In traditional networks, well-established processes and protocols such as SS7 handle these mediation functions. These procedures will certainly be more complicated in the hybrid networks of the future.
Despite these challenges, telecommunications technology will continue to evolve for the overall benefit of society. The efforts discussed in this article will play a large role in that development. For more information about these activities see visit the ISC and IETF at www.softswitch.org and www.ietf.org respectively. Hybrid IN/IP networks and the evolution of mobile IN to become more data centric is also discussed in the book Wireless Intelligent Networking - www.mobilein.com.
5.What is NGN?
Next Generation Networks (NGN) are characterized, among other things, by the prevalent use of a common packet transport for delivering a wide range of applications, from non-real-time to real-time, from single medium to multimedia. The advent of such general multi-service networks marks a major paradigm shift from today’s specialized networks with optimized performance for respective applications and gives rise to the need for supporting quality of service as dictated by various applications dynamically. This presentation will give an overview of the Q.4/13 activities on QoS support for NGN. In particular, it will highlight the emerging standard approach to dynamic, application-driven resource management that is known as the Resource and Admission Control Functions (RACF). Applicable to all network-controlled applications, the RACF can be used edge-to-edge or end-to-end, and be realized in various ways to support different business models.
There are two types of Next Generation Network (NGN): Core NGNs and Access NGNs.
Core NGNs use digital technology to connect telephone calls and other network traffic more efficiently than traditional telecoms networks. Internet Protocol (IP) based services can be developed more quickly and at lower cost to communications providers.
To build a core NGN, providers need to upgrade the equipment in telephone exchanges but don’t need to change existing wires and fibre in the ground. Ofcom’s NGN document published on 7 March 2006 focuses on core NGNs.
Access NGNs use new technology to upgrade the wires between a customer’s home or office and their local telephone exchange, sometimes known as the ‘local loop’. This upgrade might, for example, replace wires with optical fibre for part or all of the connection.
Building a core NGN does not directly affect these wires and Ofcom’s NGN document does not deal with the slightly different set of questions that this raises. Ofcom is continuing to think about access NGNs as part of ongoing market reviews and our input into the review of the European regulatory framework.
There are two types of Next Generation Network (NGN): Core NGNs and Access NGNs.
Core NGNs use digital technology to connect telephone calls and other network traffic more efficiently than traditional telecoms networks. Internet Protocol (IP) based services can be developed more quickly and at lower cost to communications providers.
To build a core NGN, providers need to upgrade the equipment in telephone exchanges but don’t need to change existing wires and fibre in the ground. Ofcom’s NGN document published on 7 March 2006 focuses on core NGNs.
Access NGNs use new technology to upgrade the wires between a customer’s home or office and their local telephone exchange, sometimes known as the ‘local loop’. This upgrade might, for example, replace wires with optical fibre for part or all of the connection.
Building a core NGN does not directly affect these wires and Ofcom’s NGN document does not deal with the slightly different set of questions that this raises. Ofcom is continuing to think about access NGNs as part of ongoing market reviews and our input into the review of the European regulatory framework.
4.What is NGN?
Real Broadband™ has taken a dramatic leap from “optional tool” or even “luxury” to “critical utility” in any competitive society.
Next generation networks transform the way we work, learn, communicate, shop, find information and entertain ourselves and our families. When today’s children are adults, their world will be very different from the world we live in presently because of services enabled by next generation networks.
The momentum surrounding next generation networks continues to grow as governments conclude that their global competitiveness and long-term socio-economic development depends on ubiquitous digital connectivity. As much as railways and roads became critical infrastructure in the previous century, broadband is widely recognized as the foundation for high-performing economies during this century.
Network engineers now have access to technology which creates the connectivity that enables essentially any end user service requirement. Uncompromised digital connectivity is in demand to enable individuals, teams and organizations to compete in a modern economy whether they are in the private or public sector. The challenge is not in developing the technology, it is applying it through a business approach that creates ubiquitous connectivity and provides a choice of services to end users.
Today, the telecommunications sector is dominated by fully integrated telecommunication companies and cable companies who were founded on a regulated utility approach focused on voice and television services respectively. This approach, referred to as the traditional telco approach, compromises both performance of the network and choice of services to end users. The Axia Next Generation Network Solution challenges the traditional telco approach.
Next generation networks transform the way we work, learn, communicate, shop, find information and entertain ourselves and our families. When today’s children are adults, their world will be very different from the world we live in presently because of services enabled by next generation networks.
The momentum surrounding next generation networks continues to grow as governments conclude that their global competitiveness and long-term socio-economic development depends on ubiquitous digital connectivity. As much as railways and roads became critical infrastructure in the previous century, broadband is widely recognized as the foundation for high-performing economies during this century.
Network engineers now have access to technology which creates the connectivity that enables essentially any end user service requirement. Uncompromised digital connectivity is in demand to enable individuals, teams and organizations to compete in a modern economy whether they are in the private or public sector. The challenge is not in developing the technology, it is applying it through a business approach that creates ubiquitous connectivity and provides a choice of services to end users.
Today, the telecommunications sector is dominated by fully integrated telecommunication companies and cable companies who were founded on a regulated utility approach focused on voice and television services respectively. This approach, referred to as the traditional telco approach, compromises both performance of the network and choice of services to end users. The Axia Next Generation Network Solution challenges the traditional telco approach.
3.What is NGN?
A Next generation network (NGN) is a packet-based network which can provide services including Telecommunication Services and able to make use of multiple broadband, Quality of Service-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies. It offers unrestricted access by users to different service providers. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users.[1].
From a practical perspective, NGN involves three main architectural changes that need to be looked at separately:
• In the core network, NGN implies a consolidation of several (dedicated or overlay) transport networks each historically built for a different service into one core transport network (often based on IP and Ethernet). It implies amongst others the migration of voice from a circuit-switched architecture (PSTN) to VoIP, and also migration of legacy services such as X.25, Frame Relay (either commercial migration of the customer to a new service like IP VPN, or technical emigration by emulation of the "legacy service" on the NGN).
• In the wired access network, NGN implies the migration from the dual system of legacy voice next to xDSL setup in local exchanges to a converged setup in which the DSLAMs integrate voice ports or VoIP, making it possible to remove the voice switching infrastructure from the exchange[2].
• In cable access network, NGN convergence implies migration of constant bit rate voice to CableLabs PacketCable standards that provide VoIP and SIP services. Both services ride over DOCSIS as the cable data layer standard.
In an NGN, there is a more defined separation between the transport (connectivity) portion of the network and the services that run on top of that transport. This means that whenever a provider wants to enable a new service, they can do so by defining it directly at the service layer without considering the transport layer - i.e. services are independent of transport details. Increasingly applications, including voice, tend to be independent of the access network (de-layering of network and applications) and will reside more on end-user devices (phone, PC, set-top box).
From a practical perspective, NGN involves three main architectural changes that need to be looked at separately:
• In the core network, NGN implies a consolidation of several (dedicated or overlay) transport networks each historically built for a different service into one core transport network (often based on IP and Ethernet). It implies amongst others the migration of voice from a circuit-switched architecture (PSTN) to VoIP, and also migration of legacy services such as X.25, Frame Relay (either commercial migration of the customer to a new service like IP VPN, or technical emigration by emulation of the "legacy service" on the NGN).
• In the wired access network, NGN implies the migration from the dual system of legacy voice next to xDSL setup in local exchanges to a converged setup in which the DSLAMs integrate voice ports or VoIP, making it possible to remove the voice switching infrastructure from the exchange[2].
• In cable access network, NGN convergence implies migration of constant bit rate voice to CableLabs PacketCable standards that provide VoIP and SIP services. Both services ride over DOCSIS as the cable data layer standard.
In an NGN, there is a more defined separation between the transport (connectivity) portion of the network and the services that run on top of that transport. This means that whenever a provider wants to enable a new service, they can do so by defining it directly at the service layer without considering the transport layer - i.e. services are independent of transport details. Increasingly applications, including voice, tend to be independent of the access network (de-layering of network and applications) and will reside more on end-user devices (phone, PC, set-top box).
2.What is NGN?
Next generation networking (NGN) is a broad term to describe key architectural evolutions in telecommunication core and access networks that will be deployed over the next 5–10 years.[when?] The general idea behind NGN is that one network transports all information and services (voice, data, and all sorts of media such as video) by encapsulating these into packets, like it is on the Internet. NGNs are commonly built around the Internet Protocol, and therefore the term "all-IP" is also sometimes used to describe the transformation toward NGN.
1.What is NGN?
The Next Generation Network (NGN) is a popular phrase used to describe the network that will replace the current PSTN network around the world today used to carry voice, fax, modem signals, etc.
By definition, the NGN is essentially a managed IP-based (i.e., packet-switched) network that enables a wide variety of services. Among those services are VoIP, videoconferencing, Instant Messaging, e-mail, and all other kinds of pakcet-switched communication services.
The ITU defined the term NGN in Recommendation Y.2001 as follows:
Next Generation Network (NGN): a packet-based network able to provide telecommunication services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies. It offers unrestricted access by users to different service providers. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users.
By definition, the NGN is essentially a managed IP-based (i.e., packet-switched) network that enables a wide variety of services. Among those services are VoIP, videoconferencing, Instant Messaging, e-mail, and all other kinds of pakcet-switched communication services.
The ITU defined the term NGN in Recommendation Y.2001 as follows:
Next Generation Network (NGN): a packet-based network able to provide telecommunication services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies. It offers unrestricted access by users to different service providers. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users.
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