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NGN (Next Generation Network) it is a when at present communication industry pays close attention to and discuss popular topic, as NGN technology development matures, NGN has become telegraphic operation business to be mixed quickly one of choices of efficient deploy network. NGN uses open network framework system, build the new-style and public telegraphic network on IP technology base, transmit, business and application are mutual and separate, the each other that realizes a network is connected and function, thereby can the whole world crosses network support to include all sorts of application such as speech, data and multimedia inside limits. NGN has following characteristics:
　　
Distributed control: Soft exchange is the control function substance of NGN, get used to the structural characteristic of IP network distributinging processing, the call control that lifts sacrificial vessel to real time sex asks to get business for its and join control a function, it is NGN call and pilot core.
　　
Open type construction: Network control interface is open, the consultative interface between network component is based on corresponding standard.
　　
Business and network are separate: Roll out independence the business provider at network operation business, make of business and application offer have bigger flexibility.
　　
The integrated business network of unifinication: In centralized management platform falls, achieve the transmission of signal of frequency, video, data and administration, provide all sorts of broadband application and traditional and telegraphic professional work.

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Have end to arrive upright QoS: The real time business such as the one’s voice in speech that bears the weight of for place and video offers wants QoS service to assure.
　　
Perfect safe mechanism: In open network structure, the dependable sex of the person that must make sure business is offerred, the safety that assures network infrastructure moves.
　　
　　 1NGN agreement system
NGN is one is opened, the network framework of much agreement, it has communication with all sorts of equipment through standard agreement, connect in order to support the each other between all sorts of networks. Main agreement has MGCP, H.248, H.323, SIP, SIP-T, SNMP, SIGTRAN, PALARY, TUP/ISUP, SCCP, TCAP, INAP, PRA.
　　
　　 2NGN and the each other that have a network are connected
Current NGN has been become new generation bears the weight of on international the main technique of all sorts of business, NGN should be had backward compatible, allow the network of flowing gradual progress.
　　
The 2.1 each other with PSTN are connected
　　
The each other of NGN and PSTN is connected include telephone channel net and the each other that believe your net to connect.
　　
The each other of telephone channel net connects: The each other between Softswitch and TG is connected use H.248 and SIGTRAN (Signaling Transport) the M2UA/IUA/V1UA agreement of consultative a group of things with common features. The butt joint of E1 circuit undertakes on relay gateway, by relay gateway circuit of the E1 that finish arrives IP in group changeover, the IP of opposite perhaps way that finish arrives in group the changeover of E1 circuit.
　　
The each other that believes your net connects: SIGTRAN is an important consultative stack in next generation networks, with the No.7 that will come true to deliver circuit to exchange a net in IP net the letter makes, the NGN that finish and the consultative each other that No.7 believes your net are connected. The net is in charge of net BitsCN.com
　　
SINGTRAN uses standard IP deferent agreement to be transmitted as ground floor, will satisfy the demand that the letter makes convey through increasing oneself function. SINGTRAN by comprise 3 times partly below.
　　
(1) the letter makes comfortable match a layer: Use at supporting specific primitive and general letter to make transmit an agreement, believe the function that your gateway realizes according to its, no.7 letter makes comfortable match a layer to be able to use a message to deliver a part the 2nd class (MTP-2) the user is comfortable match a layer (M2UA) , the message delivers a part the 2nd (MTP-2) reciprocity is comfortable match a layer (M2PA) , the message delivers a part the 3rd class (MTP-3) user comfortable match.
　　
(2) the letter makes transmit a layer: One kind makes sure the letter makes what information transmits reliably in IP net carry an agreement, use at present shed control deferent agreement (SCTP) , the Ou Lianlai that offers by SCTP assures to be in without connective IP net deferent and reliable PSTN believes your news.
　　
(3) IP agreement layer: Agreement of layer of standard IP network.
　　
The contact that No.7 letter makes dot and NGN are medium (the contact in IP net) undertake through SG each other connects basically have two kinds of kind:
　　
No.7 believes your net and the each other that are based on the No.7 of IP to believe your net to connect, believe your net and the each other that IP believes your net to connect with No.7. The first kind of each other opens way is a node in IP net a node that regards No.7 to believe your net, allocate No.7 letter to make nod encode, it is No.7 letter only your link layer and tape No.7 letter make link layer different, those who use is the link layer that is based on IP, the SG here acted as STP and media changeover function; The 2nd kind of each other opens way is the way that deferent in IP net letter makes use No.7 to believe your net no longer delivers a letter to make, the correspondence that finishs MTP-3 and IP address in SG however concerns, mix by IP its comfortable match a layer to finish what make to high-level letter to deliver, the SG here acted as to believe the function of your representative. Chinese net is in charge of allied Www_bitscn_com
　　
The 2.2 each other with PLMN are connected
　　
Through media gateway MGW (Media Gateway) join with SCP. Shift receives media gateway and UTRAN to receive a net to have complex control the face is alternant (Q.AAL2/IuUP) , shed UTRAN business changeover for business of IP/ATM core network, turn fetch receives a letter to make from the blame of UTRAN (if 3 call control the layer) from MSCserver to MSCserver or transmit the control to UTRAN commands.
　　
Gateway of media of H.248 of soft exchange support dominates a deliberation or MGCP agreement realizes the control of pair of media gateway, receive with management.
　　
The 2.3 each other with intelligent network are connected
　　
The each other of soft exchange and intelligent network connects have two kinds of kind: Be connected through believing each other of your gateway SG or join with SCP directly.
　　
The each other of soft exchange and intelligent network is connected
　　
Means one:
　　
Softswitch passes the SCP each other that believes your gateway and intelligent network to connect with INAP/CAP/TCAP/SCCP interface, provide intelligent network professional work jointly, wait for a function to the IVR that place of intelligent professional work needs, by server of resource of Softswitch pilot media (MRS) come true with media gateway, can improve network resource to take up when mixing, be delayed.
　　
When soft exchange and intelligent network each other are connected, make with the letter gateway (SG) be linked together directly, by the letter your gateway fulfils the changeover of rock-bottom agreement and address interpreter function. The each other that the letter that soft exchange and the each other that have intelligent net open main body to pass SCF of substance of implementation of SGF function substance and function of existing intelligence network, SRF, CCF in soft exchange now makes is connected. Below this means, soft exchange should handle the call of all sorts of intelligence professional work on existing intelligence network quite, may PSTN/ISDN user initiates these call, also may AG/IAD is initiated, SIP terminal initiates return a likelihood. Feedom.net
　　
Means 2:
　　
Connect with the each other of network of this locality intelligence can give soft exchange network net mouth and link of intelligent network SCP directly, agreement of the INAP that finish. Current soft exchange equipment supports the INAP agreement of fixed intelligence network, accordingly, soft exchange can secure the SCP each other of intelligent network to connect with the tradition, obtain the card of chalk it up that place of network of original and fixed intelligence offers, concentration be callinged to pay the intelligent network such as fictitious and cost, special net professional work. If later the CAP agreement of system of CAMEL of soft exchange support, WIN MAP agreement of WIN system, so soft exchange also can regard GSM and CDMA network as medium SSF, visit the SCP in GSM and CDMA network, provide all sorts of intelligence professional work for mobile user.
　　
The each other of system of 2.4 as short as shift informations is connected
　　
The instant information of server of soft exchange application (IM) the each other of system and mobile short message is connected use implementation of short message gateway, following plan institute are shown, IM server and short message gateway use China to move directly or the SP of Chinese UniCom regulation and each other of short message gateway open a deliberation: CMPP/SGIP. SMPP agreement of the standard is used between short message gateway and SMS of server of mobile short message. IM server is OK according to the reception of the message the address comes whether does differentiate arrive mobile terminal, if be the message to mobile terminal,get on message transmit to realize the message each other of mobile terminal and multimedia terminal to connect thereby to short message gateway.
　　
The 2.5 each other with Internet are connected
　　
The fictitious and attributive environment that NGN will draw lessons from mobile network adequately (VHE) the Web business technology of technology and Internet, provide all sorts of network confluence professional work. SIP is the conversational control agreement in Internet, its position is similar to telephone network sth resembling a net to believe your agreement mediumly, main function is control of call of the multimedia that finish. SIP is a conversation / media is compositive pilot is light-duty agreement, use technically at Internet, it and Internet already networks of some multimedia of support of other agreement form a complete set correspond. SIP agreement design has two important characteristics. It is to consult greatly HTTP undertakes designing, come true easily accordingly, comfortable at large-scale applying; 2 it is the user address that uses E-mail form, embed in Web webpage the SIP to the user clicks call easily, naturally realizes the shirt-sleeve business with InternetThe net is in charge of net BitsCN_com
　　
Be in in view of SIP the significant position in prospective network, industry pour into all sorts of many network application that study SIP enthusiasticly, offerred the solution of a few representative application, gave out the patulous mechanism of SIP agreement. As a result of the general principle of Internet of SIP comply with, it is a client / the agreement of server mode, because business of this SIP network is,come true through corresponding server. Among them, acting server (Proxy) the main network that is SIP network yuan, the function of the transmit that pick a way that the call that finish requests. IETF defined CPL language, for the user Xiang Jifa gives a statement, the kind that also can carry CGI undertakes controlling, borrow this to realize move of such as call, call to choose the main additional business in waiting for traditional and telegraphic net and appreciation professional work spark change direction. To all sorts of appreciation business, must install corresponding applied server, according to different platform technique, if the control of the form such as Servlet is logistic,deploy, define the consultative course of form a complete set.
　　
The 2.6 each other with other system are connected
　　
Instant information system uses the SIMPLE agreement implementation of IETF normally, can system of as instant as what support SIMPLE standard agreement information, if the MSN Messenger of Microsoft realizes each other,connect. Normally NGN system supports a variety of open standard agreements mostly, can realize each other to connect with the business communication system that uses SIP standard agreement. If the enterprise has his IP PBX to be able to support SIP agreement of the standard, soft exchange can use the each other that SIP believes your implementation and IP PBX between the bureau in group to connect. crm