CN100459723C - Method for realizing routing for next-generation network - Google Patents
Method for realizing routing for next-generation network Download PDFInfo
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- CN100459723C CN100459723C CNB021562911A CN02156291A CN100459723C CN 100459723 C CN100459723 C CN 100459723C CN B021562911 A CNB021562911 A CN B021562911A CN 02156291 A CN02156291 A CN 02156291A CN 100459723 C CN100459723 C CN 100459723C
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Abstract
In the invention, phone number mapping (ENUM) mechanism is inducted to complete route function. The hierarchical route technique makes network convert from plate structure to layered structure. Based on called number, calling entity obtains domain name and corresponding IP address from server of phone number mapping (ENUM server) and domain name system (DNS) so as to initiate a message of call setup to the IP address directly. The said entity includes soft switch (SoftSwitch), session initiate protocol user agent (SIP UA) or session initiate protocol proxy server (SIP Proxy) etc. The invention overcomes disadvantages of current route technique of static configuration, provides a method for realizing route selection in NGN effectively so as to make network maintenance and management convenient and easier to expand as well as make interconnection between networks easier.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the method that realizes route in a kind of next generation network.
Background technology
At present, next generation network (NGN:Next Generation Network) presents the trend that grows stronger day by day, the quantity of NGN number of users and soft switch (SoftSwitch) can increase rapidly in prediction, in the face of so global huge network, to solve in the NGN network routing plan and how carry out route and location fast and effectively, how to reduce the maintenance cost of network, keep internetwork mutual independence, and how to guarantee the dilatation of a part or the problems such as fluctuation that change can not cause whole network.
What adopt among the existing NGN is plane static routing technology, be to adopt planar structure between each route entity fully, static configuration routing iinformation only, be illustrated in figure 1 as plane static routing structural representation, call out when arriving for one, SoftSwitch at first judges whether to belong to local exchange information according to number, if then directly carry out call treatment by internal module; Otherwise, search routing iinformation, find the affiliated SoftSwitch of this user, and call proceeding is gone over.At present, because the SoftSwitch limited amount, by the configurable SoftSwitch that goes out the opposite end of rough office code or area code, obviously, along with the continuous increase of network size, existing static routing allocation plan is the needs that can not satisfy later network development.
Existing plane static routing technology realizes easily, economical and convenient, but because the mechanism of itself has determined it to have following shortcoming inevitably:
1) configuration is complicated, maintenance difficulties is big.For example, when dilatation, user change and bit number ascending, all relevant SoftSwitch all need revise configuration, and workload is big, and makes mistakes easily.
2) in existing NGN technology, different N GN operator may adopt diverse routing policy in its network internal, thereby brings difficulty to intercommunication.
Summary of the invention
Technical problem to be solved by this invention is: the shortcoming that overcomes existing static configuration route technology, a kind of method of routing among the NGN that realizes simply and effectively is provided, thereby make the network operation convenient management, be easy to the expansion, make internetwork interconnecting be more prone to.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be: realize the method for route in this next generation network, may further comprise the steps:
A, caller entity are Domain Name Form registering sites with the called phone number translated, and initiate inquiry to telephone number mapping server ENUM Server;
B, ENUM Server return corresponding title authority pointer NAPTR record;
C, caller entity obtain the IP address of called entity according to the NAPTR record that returns, and make a call to called entity according to this IP address and to set up message.
If do not comprise the IP address in the NAPTR that the returns record, then the caller entity to domain name system DNS inquiry corresponding IP address, returns this IP address by DNS to the caller entity according to the domain name in the NAPTR record again.
Utilize the keyword of the enumservice subdomain sign route in the occurrence of regular expression in the described NAPTR record or Service territory to represent that this NAPTR record is used to provide routing iinformation.
Described occurrence uses office code or area code, perhaps uses self-defining and office code or area code corresponding symbol.
Described entity is soft switch SoftSwitch, conversation initiating protocol user agency SIP UA or Session initiation Protocol acting server SIP Proxy.
Beneficial effect of the present invention is: the present invention is by the core net circuit domain at Voice over IP, introduce telephone number mapping (ENUM:Telephone Number Mapping) mechanism and finish routing function, by this hierarchical routing technology, make network be transformed into hierarchy from planar structure, the route data that has not only solved the big network plane formula of NGN route preferably is bulky complex too, be difficult to maintenance management, the problem that is difficult for expansion, and can guarantee the safety of NGN internal networking structure, and level is divided and can be had the fine coupling of administration structure now with operator, realize simple simultaneously, dilatation is convenient, can be operator and save the networking cost, and make the intercommunication of public exchanging telephone network (PSTN) terminal and IP terminal become to be more prone to.
The present invention can initiate the ENUM inquiry by soft switch (SoftSwitch), conversation initiating protocol user agency (SIP UA) or Session initiation Protocol acting server (SIP Proxy), and use of the present invention this by the machine-processed technology that realizes route of ENUM, in case the user has registered the data of oneself at certain operator place, these unified resource signs (URI) are to have the RFC of standard to define, and do not have the different problem of strategy so interconnect.
The present invention utilizes the occurrence of regular expression or the enumservice subdomain in Service territory to identify routing iinformation, so that and other application area of ENUM are separately (as calling out, fax, mail, business such as short message), can find required record fast like this, be used for route or calling, the scheme of these two kinds sign routing iinformations is not conflicted, also can combine use, for example, identify route with enumservice, represent affiliated office code with the occurrence of regular expression, represent terminal information with URI, if for security consideration, the occurrence of regular expression can also not use office code or area code, and uses self-defining symbol (as the signs such as jumping figure of route) corresponding with number.
In sum, the present invention has not only realized the fusion between the heterogeneous networks, and interconnecting of they is more prone to, and realizes simply can making full use of existing Internet resources, and networking is easy, is easy to maintenance and management.
Description of drawings
Fig. 1 is existing NGN midplane static routing structural representation;
Fig. 2 is a classification static routing schematic network structure of the present invention;
Fig. 3 is the call flow diagram from the PSTN network to IP network based on the ENUM route;
Fig. 4 is the call flow diagram from the IP network to the IP network based on the ENUM route;
Fig. 5 is the call flow diagram from IP network to the PSTN network based on the ENUM route;
Fig. 6 is the call flow diagram from the PSTN network to the PSTN network based on the ENUM route.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
The present invention introduces telephone number mapping (ENUM:Telephone Number Mapping) mechanism and finishes routing function by the core net circuit domain at Voice over IP, by this hierarchical routing technology, makes network be transformed into hierarchy from planar structure.ENUM mechanism is the mechanism that a kind of E.164 international telephone number is mapped as corresponding uniform resource identification (URI:UniformResource Identifier), ENUM uses the agreement RFC2916 of Internet engineering duty group (IETF) regulation, by this agreement can be earlier be domain name with number translation E.164, and then inquiry Internet domain name system (DNS:Domain Name System), obtain the IP address of the network equipment from domain name, as shown in Figure 2, the ENUM system is a hierarchical tree structure, and upward widely used domain name system (DNS) is very similar with present Internet for its distributed data base.
If calling number belongs to SoftSwitch 1 management, called number belongs to SoftSwitch 2 management, as shown in Figure 3, and in the next generation network of IP carrying, when PSTN user when gateway is initiated to the calling of IP terminal, use ENUM of the present invention mechanism and realize that the call flow of routing function is as follows:
A1, PSTN user are initiated to the calling of IP terminal to gateway.
A2, gateway are by Media Gateway Control Protocol or H.248 wait protocol signaling to be connected to SoftSwitch 1.
A3, SoftSwitch 1 compare according to the user of called number and own system management, find that this user does not belong to native system, so according to the rule of describing among the RFC2916, E.164 number translated is a Domain Name Form registering sites, be initiated to the inquiry of ENUM Server, because ENUM is a distributed system, may be through multistage ENUM Server inquiry.For example: called number is+8675526540808, SoftSwitch 1 is according to the rule of describing among the RFC2916, E.164 number translated is Domain Name Form registering sites: 8.0.8.0.4.5.6.2.5.5.7.6.8.e164.tld, and wherein 86 is the affiliated country codes of called number, and concrete rule is as follows:
1) number translated is become the E.164 number format of standard, as :+86-755-26540808;
2) remove all connectors except "+" of high order end, as :+8675526540808;
3) all nonnumeric characters are removed, as: 8675526540808;
4) between each numerical character, add some points, as: 8.6.7.5.5.2.6.5.4.0.8.0.8;
5) order of character is overturn, as: 8.0.8.0.4.5.6.2.5.5.7.6.8;
6) add " .e164.tld " at the character string end, wherein tld is a TLD, as: 8.0.8.0.4.5.6.2.5.5.7.6.8.e164.tld.
E.164 the domain name that forms of number can corresponding many Internet resources records for each, be called unified resource sign (URI), it is the form that adopts another IETF suggestion RFC 2915 definition, is called title authority pointer (NAPTR:Naming Authority Pointer).
A4, ENUM Server return corresponding NAPTR record, and the NAPTR that returns record has a plurality of, for example:
1)IN NAPTR 140 10“u”“E2U+talk:sip”“！^867552654*$！Sip:8675526540808@huawei.com！”
2)IN NAPTR 140 10“u”“E2U+talk:h323”“！^.*$！H323:user@huawei.com！”
Above-mentioned NAPTR record comprises several main territory as shown in the table, and the value in the title in territory, implication and the corresponding above-mentioned example in the 1st record is as shown in the table:
| Title | Implication | Corresponding to the value in the example |
| order | Priority | 140 |
| preference | Inferior priority | 10 |
| flag | Sign | U (that represent inquiry is URI) |
| service | Inquire about employed agreement and business | E2U+talk:sip |
| Regular Expression | Regular expression | ！^867552654*$！ sip:8675526540808@hua wei.com！ |
| replacement | Alternate domains | Null |
Among the present invention, utilize the occurrence of regular expression in the NAPTR record to represent that this record is used to provide routing iinformation, so that and other application area of ENUM separately (for example call out, business such as fax, mail, short message), this occurrence can use office code or area code, if for security consideration, this occurrence also can use self-defining and office code or area code corresponding symbol (as the signs such as jumping figure of route), and the form of regular expression is:
！<regexp>！<string>！
The implication of its expression is the content of IF expression and the numbers match of inquiry, then use the character string of back and come the replacement query number, as occurrence in above-mentioned the 1st NAPTR record is office code " 867552654 ", if with the numbers match that requires to inquire about, then Cha Xun result is exactly " Sip:8675526540808@huawei.com ", and wherein " huawei.com " is the domain name of the SoftSwitch under called.
That can utilize also that the keyword (routing) of enumservice subdomain (routing:sip) the sign route in the Service territory (as " E2U+routing:sip ") represents this record is used to provide routing iinformation, so only need judgement Service territory just can find required record fast, be used for route or calling.
Above-mentioned two kinds of schemes are not conflicted, and can combine use yet, for example, identify route with enumservice, represent affiliated office code with the occurrence of regular expression, represent terminal information with URI.
A5, SoftSwitch 1 inquire about corresponding IP address according to the domain name huawei.com in the ENUM Server return recording to DNS.
A6, DNS return the IP address of this domain name correspondence to SoftSwitch 1, i.e. the IP address of SoftSwitch2, because DNS is a distributed system, and may be through multistage DNS inquiry.
A7, SoftSwitch 1 make a call to the IP address of SoftSwitch 2 and set up message, and station to station call control signaling can adopt Session Initiation Protocol, H.323 or other signaling.
A8, SoftSwitch 2 are connected to calling on the self-administered IP user.
In the above-mentioned flow process, if comprise the IP address in the NAPTR that the returns record, then SoftSwitch 1 needn't arrive DNS and inquires about, and SoftSwitch 1 directly makes a call to SoftSwitch2 according to this IP address and sets up message.
Calling between the IP terminal and IP are to PSTN, call flow between the PSTN terminal and above-mentioned situation basically identical, SoftSwitch 1 obtains domain name and the corresponding IP address of SoftSwitch 2 to ENUM Server and DNS according to called number, directly make a call and set up message to this IP address, if comprise the IP address in the NAPTR that the returns record, then SoftSwitch 1 needn't arrive DNS and inquires about, SoftSwitch 1 directly makes a call to SoftSwitch 2 according to this IP address and sets up message, call signaling between the SoftSwitch is concrete regulation not, can be Session initiation Protocol (SIP:Session Initiation Protocol,), H.323 or other signaling, the route technology used of the present invention has nothing to do with signaling protocol.
As shown in Figure 4, for the calling between the IP terminal, use ENUM mechanism of the present invention and realize that the call flow of routing function is as follows:
B1, IP user are initiated to another IP user's calling to SoftSwitch 1.
B2, SoftSwitch 1 compare according to the user of called number and own system management, find that this user does not belong to native system, so according to the rule of describing among the RFC2916, E.164 number translated is a Domain Name Form registering sites, is initiated to the inquiry of ENUM Server.
B3, ENUM Server return corresponding NAPTR record.
B4, SoftSwitch 1 inquire about corresponding IP address according to the domain name in the ENUM Server return recording to DNS.
B5, DNS return the IP address of this domain name correspondence, i.e. the IP address of SoftSwitch2 to SoftSwitch 1.
B6, SoftSwitch 1 make a call to the IP address of SoftSwitch 2 and set up message.
B7, SoftSwitch 2 are connected to calling on the self-administered IP user.
As shown in Figure 5, when the IP user is initiated to the calling of PSTN terminal, uses ENUM mechanism of the present invention and realize that the call flow of routing function is as follows:
C1, IP user are initiated to the calling of PSTN terminal to SoftSwitch 1.
C2, SoftSwitch 1 compare according to the user of called number and own system management, find that this user does not belong to native system, so according to the rule of describing among the RFC2916, E.164 number translated is a Domain Name Form registering sites, is initiated to the inquiry of ENUM Server.
C3, ENUM Server return corresponding NAPTR record.
C4, SoftSwitch 1 inquire about corresponding IP address according to the domain name in the ENUM Server return recording to DNS.
C5, DNS return the IP address of this domain name correspondence, i.e. the IP address of SoftSwitch2 to SoftSwitch 1.
C6, SoftSwitch 1 make a call to the IP address of SoftSwitch 2 and set up message.
C7, SoftSwitch 2 will call out by Media Gateway Control Protocol or H.248 wait protocol signaling to be connected on the gateway (Gateway).
C8, gateway (Gateway) are connected to calling on the self-administered PSTN user.
As shown in Figure 6, for the calling between the PSTN terminal, use ENUM mechanism of the present invention and realize that the call flow of routing function is as follows:
D1, PSTN user are initiated to another PSTN user's calling to gateway.
D2, gateway are by Media Gateway Control Protocol or H.248 wait protocol signaling to be connected to SoftSwitch 1.
D3, SoftSwitch 1 compare according to the user of called number and own system management, find that this user does not belong to native system, so according to the rule of describing among the RFC2916, E.164 number translated is a Domain Name Form registering sites, is initiated to the inquiry of ENUM Server.
D4, ENUM Server return corresponding NAPTR record.
D5, SoftSwitch 1 inquire about corresponding IP address according to the domain name in the ENUM Server return recording to DNS.
D6, DNS return the IP address of this domain name correspondence, i.e. the IP address of SoftSwitch2 to SoftSwitch 1.
D7, SoftSwitch 1 make a call to the IP address of SoftSwitch 2 and set up message.
D8, SoftSwitch 2 will call out by Media Gateway Control Protocol or H.248 wait protocol signaling to be connected on the gateway (Gateway).
D9, gateway (Gateway) are connected to calling on the self-administered PSTN user.
Need to prove that the calling between the PSTN terminal only is applicable to toll telephone, local telephone network there is no need to use the ENUM inquiry.
NGN network routing plan of the present invention is not the unique user service, be soft switch (SoftSwitch) service in the present embodiment for the control user, that is to say, this scheme only navigates to the SoftSwitch into user's service, can't navigate to serviced user self, what use ENUM found is the routing iinformation of management called subscriber's SoftSwitch, but not terminal called.Initiate also to can be conversation initiating protocol user agency (SIP UA) or Session initiation Protocol acting server (SIPProxy) etc. the soft switch (SoftSwitch) of entity in present embodiment of ENUM inquiry.
Use this ENUM of passing through mechanism of the present invention to realize the technology of route, in case the user has registered the data of oneself at certain operator place, these unified resource signs (URI) are to have the RFC of standard to define, and do not have the different problem of strategy so interconnect.The route data that the present invention has not only solved the big network plane formula of NGN route preferably is bulky complex too, the problem that is difficult to maintenance management, difficult expansion, and can guarantee the safety of NGN internal networking structure, realize simple simultaneously, dilatation is convenient, can be operator and save the networking cost, and make the intercommunication of public exchanging telephone network (PSTN) terminal and IP terminal become to be more prone to.
Claims (5)
1. realize the method for route in the next generation network, may further comprise the steps:
A, caller entity are Domain Name Form registering sites with the called phone number translated, and initiate inquiry to telephone number mapping server ENUM Server;
B, ENUM Server return corresponding title authority pointer NAPTR record;
C, caller entity obtain the IP address of called entity according to the NAPTR record that returns, and make a call to called entity according to this IP address and to set up message.
2. realize the method for route in the next generation network according to claim 1, it is characterized in that: if do not comprise the IP address in the NAPTR that the returns record, then the caller entity to domain name system DNS inquiry corresponding IP address, returns this IP address by DNS to the caller entity according to the domain name in the NAPTR record again.
3. realize the method for route in the next generation network according to claim 1 and 2, it is characterized in that: utilize the keyword of the enumservice subdomain sign route in the occurrence of regular expression in the described NAPTR record or Service territory to represent that this NAPTR record is used to provide routing iinformation.
4. realize the method for route in the next generation network according to claim 3, it is characterized in that: described occurrence uses office code or area code, perhaps uses self-defining and office code or area code corresponding symbol.
5. realize the method for route in the next generation network according to claim 3, it is characterized in that: described entity is soft switch SoftSwitch, conversation initiating protocol user agency SIP UA or Session initiation Protocol acting server SIP Proxy.
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| CNB021562911A CN100459723C (en) | 2002-12-15 | 2002-12-15 | Method for realizing routing for next-generation network |
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| CNB021562911A CN100459723C (en) | 2002-12-15 | 2002-12-15 | Method for realizing routing for next-generation network |
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| CN100459723C true CN100459723C (en) | 2009-02-04 |
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| CN107193851B (en) * | 2016-06-27 | 2020-09-15 | 北京新媒传信科技有限公司 | Data query method and device |
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