WO2023116288A1 - 容灾方法、系统、装置、备用ip-sm-gw和可读存储介质 - Google Patents

容灾方法、系统、装置、备用ip-sm-gw和可读存储介质 Download PDF

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Publication number
WO2023116288A1
WO2023116288A1 PCT/CN2022/132682 CN2022132682W WO2023116288A1 WO 2023116288 A1 WO2023116288 A1 WO 2023116288A1 CN 2022132682 W CN2022132682 W CN 2022132682W WO 2023116288 A1 WO2023116288 A1 WO 2023116288A1
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Prior art keywords
network element
called terminal
cscf network
location information
disaster recovery
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PCT/CN2022/132682
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English (en)
French (fr)
Inventor
于雷
安韶辉
张磊
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/12—Messaging; Mailboxes; Announcements
    • H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/30—Network data restoration; Network data reliability; Network data fault tolerance

Definitions

  • the embodiments of the present application relate to the technical field of communications, and in particular to a disaster recovery method, system, device, backup IP-SM-GW and readable storage medium.
  • IP-Short-Message-Gateway IP-SM-GW
  • IP-SM-GW IP short message network element
  • STP Signaling Transfer Point
  • the standby IP-SM-GW does not have the registration cache information of the called terminal.
  • the 4G terminal is in the IP Multimedia System (IP Multimedia Subsystem, IMS) domain and (Circuit Switched, CS) domains are dual-attached, so the standby IP-SM-GW can send short messages through the CS domain.
  • the current disaster recovery mechanism of the IP-SM-GW relies on the feature of dual attachment of 4G terminals.
  • 5G short messages are still delivered through the IMS domain.
  • 5G terminals do not have the feature of dual attachment, so they cannot be delivered from the CS domain, which will cause the main and standby IP-SM-GW switching
  • the 5G terminal may not be able to receive text messages for a long time until the periodic registration is re-initiated, so it is difficult to ensure the normal sending and receiving of text messages during the switching process of the active and standby IP-SM-GW.
  • the main purpose of the embodiment of this application is to propose a disaster recovery method, system, device, backup IP-SM-GW and readable storage medium, so that even if it does not have the dual attachment characteristics of the IMS domain and the CS domain, it can also ensure that the primary Normal sending and receiving of short messages during standby IP-SM-GW handover.
  • the embodiment of the present application provides a disaster recovery method, which is applied to the backup IP short message gateway IP-SM-GW, including: receiving the termination request forwarded by the signaling transfer node STP; wherein, the termination The call request is forwarded by the STP after determining that the primary IP-SM-GW is abnormal, and the call termination request carries the ISDN number of the called terminal; according to the ISDN number, determine the affiliation of the called terminal.
  • the location information of the call session control function CSCF network element according to the location information of the CSCF network element, send the call termination request to the CSCF network element.
  • the embodiment of the present application also provides a disaster recovery system, including: STP, active IP-SM-GW, backup IP-SM-GW and CSCF network elements;
  • the STP is used to receive terminal call request, and if it is determined that the active IP-SM-GW is abnormal, forward the call termination request to the standby IP-SM-GW; wherein, the call termination request carries the Integrated Services Digital Network ISDN number;
  • the standby IP-SM-GW is used to determine the location information of the call session control function CSCF network element to which the called terminal belongs according to the ISDN number, and according to the CSCF network send the call termination request to the CSCF network element.
  • the embodiment of the present application also provides a disaster recovery device, including: a receiving module, a determining module, and a sending module; the receiving module is used to receive the call termination request forwarded by the signaling transfer node STP; wherein , the call termination request is forwarded after the STP determines that the primary IP-SM-GW is abnormal, and the call termination request carries the ISDN number of the called terminal; the determination module is configured to, according to the The ISDN number is used to determine the location information of the call session control function CSCF network element to which the called terminal belongs; the sending module is configured to send the terminal to the CSCF network element according to the location information of the CSCF network element call request.
  • an embodiment of the present application further provides a standby IP-SM-GW, including: at least one processor; and a memory connected to the at least one processor in communication; wherein, the memory stores An instruction that can be executed by the at least one processor, the instruction is executed by the at least one processor, so that the at least one processor can execute the above disaster recovery method.
  • an embodiment of the present application further provides a computer-readable storage medium storing a computer program, and implementing the above disaster recovery method when the computer program is executed by a processor.
  • the standby IP-SM-GW receives the final call request forwarded by the signaling transfer node STP;
  • the ISDN number of the called terminal the standby IP-SM-GW determines the location information of the call session control function CSCF network element to which the called terminal belongs according to the ISDN number, and then reports to the CSCF according to the location information of the CSCF network element
  • the network element sends a call termination request. That is to say, in this embodiment, after the active IP-SM-GW is abnormal, the standby IP-SM-GW can determine the CSCF to which the called terminal belongs according to the ISDN number of the called terminal carried in the received call termination request.
  • the location information of the network element so as to send the terminal call request to the determined CSCF network element, because the CSCF network element belongs to the network element in the IMS domain, therefore, in this embodiment, even if it does not have the feature of dual attachment of the IMS domain and the CS domain , it can also accurately lock the CSCF network element to which the called terminal belongs during the disaster recovery process, so as to finally complete the information delivery in the IMS domain, so as to ensure that the short message can be sent and received normally during the switching process of the active and standby IP-SM-GW.
  • Fig. 1 is the flowchart of the disaster recovery method mentioned in the embodiment of the present application.
  • FIG. 2 is a flowchart of an implementation of step 102 mentioned in the embodiment of the present application.
  • FIG. 3 is a flowchart of an implementation of step 1023 mentioned in the embodiment of the present application.
  • FIG. 4 is a flowchart of interaction between network elements when the primary IP-SM-GW is abnormal when the disaster recovery method mentioned in the embodiment of the present application is not used;
  • FIG. 5 is a flow chart of interaction between network elements when the primary IP-SM-GW is abnormal when the disaster recovery method mentioned in the embodiment of the present application is used;
  • Fig. 6 is a schematic diagram of the disaster recovery system mentioned in the embodiment of the present application.
  • Fig. 7 is a schematic diagram of the disaster recovery device mentioned in the embodiment of the present application.
  • Fig. 8 is a schematic structural diagram of the backup IP-SM-GW mentioned in the embodiment of the present application.
  • Some embodiments of the present application relate to a disaster recovery method, which is applied to a standby IP-SM-GW.
  • the application scenario of this embodiment is: the process of master IP-SM-GW switching, that is, after the master IP-SM-GW is abnormal, it is necessary to switch the functions implemented on the master IP-SM-GW to the standby IP-SM-GW. GW came up to realize it.
  • this embodiment can be applied to a scenario where a 5G terminal attaches to an IMS domain and sends and receives short messages through an IP-SM-GW network element. When the active IP-SM-GW network element is abnormal, the standby network element can successfully complete sending and receiving short messages.
  • the flowchart of the disaster recovery method can refer to FIG. 1, including:
  • Step 101 Receive an end call request forwarded by the STP; where the end call request is forwarded by the STP after determining that the active IP-SM-GW is abnormal, and the end call request carries the ISDN number of the called terminal.
  • Step 102 According to the ISDN number, determine the location information of the CSCF network element to which the called terminal belongs.
  • Step 103 Send a call termination request to the CSCF network element according to the location information of the CSCF network element.
  • the standby IP-SM-GW can determine the call session to which the called terminal belongs according to the ISDN number of the called terminal carried in the received call termination request. Control the location information of the functional network element, so as to send a terminal call request to the determined CSCF network element. Since the CSCF network element belongs to the network element in the IMS domain, even if there is no dual attachment of the IMS domain and the CS domain in this embodiment It can also accurately lock the CSCF network element to which the called terminal belongs during the disaster recovery process, so that the delivery is finally completed in the IMS domain, so as to ensure that the short message can be sent and received normally during the switching process of the active and standby IP-SM-GW.
  • the Short Message Service Center (Short Message Service Center, SMSC) initiates a terminal call request to the STP, and the terminal call request carries the (Integrated Services Digital Network, ISDN) ISDN number of the called terminal, and the ISDN number can be understood as a telephone number .
  • the STP first forwards the call termination request to the active IP-SM-GW, and then the STP finds that the active IP-SM-GW is abnormal, then the STP forwards the call termination request to the standby IP-SM-GW , so that the standby IP-SM-GW can receive the call termination request forwarded by the STP.
  • the terminal call request may also include a sending terminal routing query request (SEND ROUTING INFO, SRI) and a short message terminal call (MT FORWARD, MTFWD) message.
  • the standby IP-SM-GW determines the location information of the (Call Session Control Function, CSCF) network element to which the called terminal belongs according to the ISDN number. That is to say, the standby IP-SM-GW determines the location information of the CSCF network element to which the called terminal belongs according to the phone number of the called terminal. It can be understood that, generally, the geographical location to which the telephone number belongs can be determined according to the telephone number. In this embodiment, the location information of the CSCF network element to which the called terminal belongs can be determined according to the geographical location to which the telephone number belongs. The location information of the CSCF network element can be understood as the network location information of the CSCF network element.
  • the standby IP-SM-GW locks only one CSCF network element according to the location information of the CSCF network element, and sends a terminal call request to the CSCF network element, so that the CSCF network element can respond to the terminal call request.
  • a flowchart of an implementation manner of determining the location information of the CSCF network element to which the called terminal belongs can refer to FIG. 2 , including:
  • Step 1021 initiate a user data request UDR to the home location register HLR or the home subscriber server HSS; wherein, the UDR carries an ISDN number.
  • Step 1022 Receive the user data response UDA sent by the HLR or HSS; wherein, the UDA carries the URI of the called terminal.
  • Step 1023 According to the URI of the called terminal, query the DNS server for the location information of the CSCF network element to which the called terminal belongs.
  • the URI of the called terminal is obtained, so that the backup IP-SM-GW can accurately query the name of the called terminal on the DNS according to the URI of the called terminal.
  • the location information of the CSCF network element to which it belongs so as to ensure that during the switchover process of the active and standby IP-SM-GW, even if it does not have the dual attachment feature of the IMS domain and the CS domain, the short messages that need to be sent and received can be sent and received normally and accurately.
  • the user data request (user data request, UDR) initiated by the standby IP-SM-GW to the home location register (Home Location Registe, HLR) or home subscriber server (Home Subscriber Server, HSS) can be understood as Query the Uniform Resource Identifier (URI) of the called terminal.
  • the HLR or HSS returns a user data response (user data answer, UDA) carrying the URI of the called terminal to the standby IP-SM-GW.
  • the standby IP-SM-GW queries the location information of the CSCF network element to which the called terminal belongs on a domain name system (Domain Name System, DNS) server according to the URI of the called terminal.
  • DNS Domain Name System
  • a flowchart of an implementation manner of step 1023 can refer to FIG. 3 , including:
  • Step 301 Send a first query command to the DNS server; wherein, the first query command carries the domain name of the URI, and the first query command is used to query the port number and host name of the CSCF network element to which the called terminal belongs.
  • Step 302 Receive the port number and host name of the CSCF network element to which the called terminal belongs as replied by the DNS server.
  • Step 303 Query the location information of the CSCF network element to which the called terminal belongs according to the port number and the host name.
  • the standby IP-SM-GW sends the first query command of the domain name carrying the URI to the domain name server DNS server, and can query the port number and host name of the CSCF network element to which the called terminal belongs on the DNS server. Therefore, according to the queried port number and host name, it is convenient to accurately query the location information of the CSCF network element to which the called terminal belongs.
  • the first query command sent by the standby IP-SM-GW to the DNS server may be a DNS server resource (SERVER, SRV) record query command
  • the SRV record is a type of resource record supported in the database of the DNS server , the role of the SRV record is to indicate the services provided under a certain domain name.
  • the DNS can return the port number PORT and host name HOST of the CSCF network element to which the called terminal belongs to the standby IP-SM-GW after receiving the query command.
  • the standby IP-SM-GW queries the location information of the CSCF network element to which the called terminal belongs according to the port number and the host name.
  • the standby IP-SM-GW may send a second query command to the DNS, the second query command carries the hostname, and the second query command is used to query the IP address of the CSCF network element to which the called terminal belongs.
  • the IP address of the CSCF network element to which the called terminal belongs receives the DNS reply, and the port number, host name and IP address are used as the location information of the CSCF network element to which the called terminal belongs.
  • the second query command may be a DNS address (Address, A) record query command
  • the A record is used to specify the IP address record corresponding to the host name (or domain name).
  • the DNS can return the IP address of the CSCF network element to which the called terminal belongs to the standby IP-SM-GW after receiving the query command.
  • the standby IP-SM-GW obtains the port number, host name and IP address of the CSCF network element to which the called terminal belongs, so that a CSCF network element can be uniquely determined.
  • the standby IP-SM-GW facilitates accurate acquisition of the CSCF network to which the called terminal belongs by initiating a series of requests (such as user data request UDR, first query command, and second query command) to HSS and DNS. Yuan's HOST, IP address, PORT, and finally complete information delivery in the IMS domain.
  • the location information of the CSCF network element to which the called terminal belongs before determining the location information of the CSCF network element to which the called terminal belongs according to the ISDN number in step 102, it also includes: querying whether the registration information of the called terminal is cached in the standby IP-SM-GW; wherein , the registration information includes: location information of the CSCF network element to which the called terminal belongs.
  • the location information of the CSCF network element to which the called terminal belongs is determined according to the ISDN.
  • the registration information of the called terminal is cached in the backup IP-SM-GW, there is no need to initiate a series of instructions to obtain the location information of the CSCF network element to which the called terminal belongs.
  • the standby IP-SM-GW includes: a service unit and a cache unit.
  • the business unit is used to complete the codec adaptation with the standard industrial local area network (Manufacturing Automation Protocol, MAP) protocol, session initiation protocol (Session Initiation Protocol, SIP), and Dimeter protocol of factory automation, and realize the intercommunication with external network elements.
  • the caching unit is used for caching the periodic registration information of the user, so as to realize the delivery of the short message in the IMS domain.
  • the standby IP-SM-GW may query the registration information of the called terminal in the cache unit through the service unit to determine whether the registration information of the called terminal can be queried.
  • step 102 is executed again when the registration information of the called terminal is not queried, that is, the registration information of the called terminal is not cached in the cache unit. That is to say, in this embodiment, when the standby IP-SM-GW receives the call termination request, it detects that the registration information of the called terminal is not cached in the cache unit, and then the IP-SM-GW initiates a series of Request to obtain the HOST, IP address, and PORT of the CSCF network element to which the called terminal belongs, and finally complete the delivery in the IMS domain to ensure the normal sending and receiving of 5G SMS during the disaster recovery process.
  • the terminal call request is initiated by the short message center SMSC to the STP, and after sending the terminal call request to the CSCF network element, it further includes: the standby IP-SM-GW receives the response information of the CSCF network element to the terminal call request, Reply to the SMSC with response information to the call termination request, so that the SMSC can clearly initiate that the call termination request has been successfully responded.
  • FIG. 4 is a flow chart of interaction between network elements when the primary IP-SM-GW is abnormal without using the disaster recovery method in the embodiment of the present application, including:
  • Step 401 The SMSC initiates a call termination request (including SRI+MTFWD) to the STP, and the call termination request carries the ISDN number of the called terminal.
  • a call termination request including SRI+MTFWD
  • Step 402 The STP forwards the call termination request to the active IP-SM-GW, and finds that the active IP-SM-GW is abnormal.
  • Step 403 The STP forwards the call termination request to the standby IP-SM-GW.
  • Step 404 The service unit of the standby IP-SM-GW queries the registration information of the called terminal.
  • Step 405 The caching unit of the standby IP-SM-GW does not cache the registration information of the called terminal, and returns a message that the registration information of the called terminal is not cached to the service unit. That is, the cache unit returns to the service unit that the registration information does not exist.
  • Step 406 The standby IP-SM-GW switches the called party to the CS domain for delivery, and the service unit sends an SRI query routing information to the HSS or HLR, carrying the ISDN of the called terminal.
  • Step 407 The HSS or HLR replies to the standby IP-SM-GW with a failure response to querying the SRI. Among them, because the 5G terminal cannot attach to the CS domain, the HSS or HLR fails to query the SRI.
  • Step 408 The standby IP-SM-GW returns a call termination failure response to the SMSC.
  • the cache unit When the terminal initiates periodic registration, the cache unit will save the registration information of the terminal, and when the next call is terminated, the short message can be sent from the SIP domain.
  • FIG. 5 is a flowchart of interaction between network elements when the primary IP-SM-GW is abnormal when the disaster recovery method in the embodiment of the present application is used, including:
  • Step 501 The SMSC initiates a call termination request (including SRI+MTFWD) to the STP, and the call termination request carries the ISDN number of the called terminal.
  • a call termination request including SRI+MTFWD
  • Step 502 The STP forwards the call termination request to the active IP-SM-GW, and finds that the active IP-SM-GW is abnormal.
  • the call termination request includes an SRI+M message.
  • the call termination request includes SRI+MTFWD.
  • Step 503 The STP forwards the call termination request to the standby IP-SM-GW.
  • the call termination request includes SRI+MTFWD.
  • Step 504 The service unit of the standby IP-SM-GW queries the registration information of the called terminal.
  • Step 505 The caching unit of the standby IP-SM-GW does not cache the registration information of the called terminal, and returns a message that the registration information of the called terminal is not cached to the service unit.
  • Step 506 The service unit of the standby IP-SM-GW initiates a UDR to the HLR or HSS, and the UDR carries the ISDN of the called terminal.
  • Step 507 The HLR or HSS replies a UDA response to the standby IP-SM-GW, and the UDA response carries the URI of the called terminal.
  • Step 508 The standby IP-SM-GW initiates a DNS SRV record query command to the DNS server, and the DNS SRV record query command carries the domain name part of the URI of the called terminal.
  • the DNS SRV record query command is the DNS SRV in the figure.
  • Step 509 The DNS server replies a DNS SRV record query response to the standby IP-SM-GW, and the DNS SRV record query response carries the PORT and HOST of the CSCF network element.
  • the DNS SRV record query response is the DNS SRV-Ack in the figure.
  • Step 510 The standby IP-SM-GW initiates a DNS A record query command to the DNS server, and the DNS A record query command carries the HOST of the CSCF network element.
  • the DNS A record query command is the DNSA in the figure.
  • Step 511 The DNS server replies a DNS A record query response to the standby IP-SM-GW, and the DNS A record query response carries the IP address of the CSCF network element.
  • the DNSA record query response is the DNS A-Ack in the figure.
  • Step 512 The standby IP-SM-GW initiates a call termination request to the CSCF network element to which the called terminal belongs according to the URI of the called terminal, the IP address of the CSCF network element, the PORT, and the HOST.
  • the call termination request includes SRI+MTFWD.
  • Step 513 The CSCF network element replies an end call response to the standby IP-SM-GW.
  • Step 514 The standby IP-SM-GW replies an end call response to the SMSC.
  • step division of the above various methods is only for the sake of clarity of description. During implementation, it can be combined into one step or some steps can be split and decomposed into multiple steps. As long as they include the same logical relationship, they are all within the scope of protection of this patent. ; Adding insignificant modifications or introducing insignificant designs to the algorithm or process, but not changing the core design of the algorithm and process are all within the scope of protection of this patent.
  • the embodiment of the present application also provides a disaster recovery system, as shown in FIG. 6 , including: STP601, active IP-SM-GW602, standby IP-SM-GW603 and CSCF network element 604.
  • STP601 is used to receive the terminal call request, and forward the terminal call request to the standby IP-SM-GW603 when it is determined that the primary IP-SM-GW602 is abnormal; where the terminal call request carries the comprehensive service of the called terminal Digital Network ISDN number;
  • Standby IP-SM-GW603 is used to determine the location information of the call session control function CSCF network element to which the called terminal belongs according to the ISDN number, and send a call termination request to the CSCF network element according to the location information of the CSCF network element.
  • this embodiment is a system embodiment corresponding to the above method embodiment, and this embodiment can be implemented in cooperation with the above method embodiment.
  • the relevant technical details and technical effects mentioned in the foregoing method embodiments are still valid in this embodiment, and will not be repeated here in order to reduce repetition.
  • the relevant technical details mentioned in this embodiment can also be applied to the above method embodiments.
  • the embodiment of the present application also provides a disaster recovery device, as shown in FIG. 7 , including: a receiving module 701 , a determining module 702 and a sending module 703 .
  • the receiving module 701 is configured to receive an end call request forwarded by the signaling transfer node STP; wherein, the end call request is forwarded after the STP determines that the primary IP-SM-GW is abnormal, and the end call request carries the ISDN of the called terminal ISDN number.
  • the determining module 702 is configured to determine the location information of the CSCF network element to which the called terminal belongs according to the ISDN number.
  • the sending module 703 is configured to send a call termination request to the CSCF network element according to the location information of the CSCF network element.
  • this embodiment is an apparatus embodiment corresponding to the above method embodiment, and the relevant technical details and technical effects mentioned in the above method embodiment are still valid in this embodiment, and are not repeated here to reduce repetition.
  • the relevant technical details mentioned in this embodiment can also be applied to the above method embodiments.
  • modules involved in this embodiment are logical modules.
  • a logical unit can be a physical unit, or a part of a physical unit, or multiple physical units. Combination of units.
  • units that are not closely related to solving the technical problem proposed in the present application are not introduced in this embodiment, but this does not mean that there are no other units in this embodiment.
  • the embodiment of the present application also provides a standby IP-SM-GW, as shown in FIG. 8 , including: at least one processor 801; and a memory 802 communicatively connected to the at least one processor 801; wherein, the memory 802 stores An instruction that can be executed by at least one processor 801, the instruction is executed by the at least one processor 801, so that the at least one processor 801 can execute the disaster recovery method in the foregoing embodiment.
  • the memory 802 and the processor 801 are connected by a bus, and the bus may include any number of interconnected buses and bridges, and the bus connects one or more processors 801 and various circuits of the memory 802 together.
  • the bus may also connect together various other circuits such as peripherals, voltage regulators, and power management circuits, all of which are well known in the art and therefore will not be further described herein.
  • the bus interface provides an interface between the bus and the transceivers.
  • a transceiver may be a single element or multiple elements, such as multiple receivers and transmitters, providing means for communicating with various other devices over a transmission medium.
  • the data processed by the processor 801 is transmitted on the wireless medium through the antenna, and further, the antenna also receives the data and transmits the data to the processor 801 .
  • the processor 801 is responsible for managing the bus and general processing, and may also provide various functions including timing, peripheral interface, voltage regulation, power management and other control functions. And the memory 802 may be used to store data used by the processor 801 when performing operations.
  • the embodiment of the present application also provides a computer-readable storage medium storing a computer program.
  • the above method embodiments are implemented when the computer program is executed by the processor.
  • the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disk or optical disk and other media that can store program codes.

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Abstract

本申请实施例涉及一种容灾方法、系统、装置、备用IP-SM-GW和可读存储介质。上述容灾方法包括：接收信令传输节点STP转发的终呼请求；其中，所述终呼请求由所述STP确定主用IP-SM-GW异常后转发，所述终呼请求中携带被叫终端的综合服务数字网ISDN号码；根据所述ISDN号码，确定所述被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息；根据所述CSCF网元的位置信息，向所述CSCF网元发送所述终呼请求。

Description

容灾方法、系统、装置、备用IP-SM-GW和可读存储介质
相关申请
本申请要求于2021年12月23日申请的、申请号为202111590245.0的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信技术领域，特别涉及一种容灾方法、系统、装置、备用IP-SM-GW和可读存储介质。
背景技术
IP短消息网元(IP-Short-Message-Gateway，IP-SM-GW)当前的容灾方式为：主用IP-SM-GW异常，信令传输节点(Signaling Transfer Point，STP)监测到主用异常，会把短信转到备用IP-SM-GW，此时备用IP-SM-GW没有被叫终端的注册缓存信息，由于4G终端在IP多媒体系统(IP Multimedia Subsystem，IMS)域和电路交换(Circuit Switched，CS)域是双附着的，所以备用IP-SM-GW可以通过CS域将短信下发下去。也就是说，当前IP-SM-GW的容灾机制依赖4G终端双附着的特性。
随着5G终端的接入，5G短信还是通过IMS域下发，不同的是5G终端不具有双附着的特性，也就无法从CS域下发，这样就会造成主备IP-SM-GW切换时，5G终端在长时间内可能无法接收短信，直到重新发起周期性注册，从而难以保证主备IP-SM-GW切换过程中短信的正常收发。
发明内容
本申请实施例的主要目的在于提出一种容灾方法、系统、装置、备用IP-SM-GW和可读存储介质，使得即使不具备IMS域和CS域的双附着的特性，也可以保证主备IP-SM-GW切换过程中短信的正常收发。
为至少实现上述目的，本申请实施例提供了一种容灾方法，应用于备用IP短消息网关IP-SM-GW，包括：接收信令传输节点STP转发的终呼请求；其中，所述终呼请求由所述STP确定主用IP-SM-GW异常后转发，所述终呼请求中携带被叫终端的综合服务数字网ISDN号码；根据所述ISDN号码，确定所述被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息；根据所述CSCF网元的位置信息，向所述CSCF网元发送所述终呼请求。
为至少实现上述目的，本申请实施例还提供了一种容灾系统，包括：STP、主用IP-SM-GW、备用IP-SM-GW和CSCF网元；所述STP，用于接收终呼请求，并在确定所述主用IP-SM-GW异常的情况下，将所述终呼请求转发至所述备用IP-SM-GW；其中，所述终呼请求中携带被叫终端的综合服务数字网ISDN号码；所述备用IP-SM-GW，用于根据所述ISDN号码，确定所述被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息，并根据所述CSCF网元的位置信息，向所述CSCF网元发送所述终呼请求。
为至少实现上述目的，本申请实施例还提供了一种容灾装置，包括：接收模块、确定模块和发送模块；所述接收模块，用于接收信令传输节点STP转发的终呼请求；其中，所述终呼请求由所述STP确定主用IP-SM-GW异常后转发，所述终呼请求中携带被叫终端的综合服务数字网ISDN号码；所述确定模块，用于根据所述ISDN号码，确定所述被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息；所述发送模块，用于根据所述CSCF网元的位 置信息，向所述CSCF网元发送所述终呼请求。
为至少实现上述目的，本申请实施例还提供了一种备用IP-SM-GW，包括：至少一个处理器；以及，与所述至少一个处理器通信连接的存储器；其中，所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行上述的容灾方法。
为至少实现上述目的，本申请实施例还提供了一种计算机可读存储介质，存储有计算机程序，所述计算机程序被处理器执行时实现上述的容灾方法。
本申请实施例提供的容灾方法，备用IP-SM-GW接收信令传输节点STP转发的终呼请求；终呼请求由STP确定主用IP-SM-GW异常后转发，终呼请求中携带被叫终端的综合服务数字网ISDN号码，备用IP-SM-GW根据ISDN号码，确定被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息，再根据CSCF网元的位置信息，向CSCF网元发送终呼请求。也就是说，本实施例中，主用IP-SM-GW异常后，备用IP-SM-GW可以根据接收的终呼请求中携带的被叫终端的ISDN号码，确定被叫终端所归属的CSCF网元的位置信息，从而向确定的该CSCF网元发送终呼请求，由于CSCF网元属于IMS域中的网元，因此，本实施例中即使不具备IMS域和CS域的双附着的特性，也可以在容灾过程中准确锁定被叫终端所归属的CSCF网元，从而最终在IMS域完成信息投递，以保证主备IP-SM-GW切换过程中短信能够正常收发。
附图说明
图1是本申请实施例中提到的容灾方法的流程图；
图2是本申请实施例中提到的步骤102的一种实现方式的流程图；
图3是本申请实施例中提到的步骤1023的一种实现方式的流程图；
图4是本申请实施例中提到的未使用本申请实施例中的容灾方法的情况下，主用IP-SM-GW异常时，各网元之间的交互流程图；
图5是本申请实施例中提到的使用了本申请实施例中的容灾方法的情况下，主用IP-SM-GW异常时，各网元之间的交互流程图；
图6是本申请实施例中提到的容灾系统的示意图；
图7是本申请实施例中提到的容灾装置的示意图；
图8是本申请实施例中提到的备用IP-SM-GW的结构示意图。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本申请的各实施例进行详细的阐述。然而，本领域的普通技术人员可以理解，在本申请各实施例中，为了使读者更好地理解本申请而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施例的种种变化和修改，也可以实现本申请所要求保护的技术方案。以下各个实施例的划分是为了描述方便，不应对本申请的具体实现方式构成任何限定，各个实施例在不矛盾的前提下可以相互结合相互引用。
本申请的一些实施例涉及一种容灾方法，应用于备用IP-SM-GW。本实施例的应用场景为：主被IP-SM-GW切换的过程，即主用IP-SM-GW异常后，需要将主用IP-SM-GW上实现 的功能切换到备用IP-SM-GW上来实现。比如，本实施例可以应用于5G终端附着IMS域，通过IP-SM-GW网元来收发短信的场景，当主用IP-SM-GW网元异常后，可以通过备用网元顺利完成收发短信。
在一个实施例中，容灾方法的流程图可以参阅图1，包括：
步骤101：接收STP转发的终呼请求；其中，终呼请求由STP确定主用IP-SM-GW异常后转发，终呼请求中携带被叫终端的综合服务数字网ISDN号码。
步骤102：根据ISDN号码，确定被叫终端所归属的CSCF网元的位置信息。
步骤103：根据CSCF网元的位置信息，向CSCF网元发送终呼请求。
本实施例中，主用IP-SM-GW异常后，备用IP-SM-GW可以根据接收的终呼请求中携带的被叫终端的综合业务数字网号码，确定被叫终端所归属的呼叫会话控制功能网元的位置信息，从而向确定的该CSCF网元发送终呼请求，由于CSCF网元属于IMS域中的网元，因此，本实施例中即使不具备IMS域和CS域的双附着的特性，也可以在容灾过程中准确锁定被叫终端所归属的CSCF网元，从而最终在IMS域完成投递，以保证主备IP-SM-GW切换过程中短信能够正常收发。
在步骤101中，短消息中心(Short Message Service Center，SMSC)向STP发起终呼请求，终呼请求中携带被叫终端的(Integrated Services Digital Network，ISDN)ISDN号码，ISDN号码可以理解为电话号码。SMSC向STP发起终呼请求后，STP先转发该终呼请求到主用IP-SM-GW，然后STP发现主用IP-SM-GW异常，则STP转发终呼请求到备用IP-SM-GW，从而，备用IP-SM-GW能够收到STP转发的终呼请求。在具体实现中，终呼请求中还可以包含发送终端路由查询请求(SEND ROUTING INFO，SRI)和短消息终呼(MT FORWARD，MTFWD)消息。
在步骤102中，备用IP-SM-GW根据ISDN号码，确定被叫终端所归属的(Call Session Control Function，CSCF)网元的位置信息。也就是说，备用IP-SM-GW根据被叫终端的电话号码，确定被叫终端所归属的CSCF网元的位置信息。可以理解的是，通常根据电话号码可以确定该电话号码归属的地理位置，本实施例中可以根据电话号码归属的地理位置，确定被叫终端所归属的CSCF网元的位置信息。CSCF网元的位置信息可以理解为CSCF网元的网络位置信息。
在步骤103中，备用IP-SM-GW根据CSCF网元的位置信息，锁定唯一一个CSCF网元，从而向该CSCF网元发送终呼请求，以使得CSCF网元可以响应该终呼请求。
在一个实施例中，步骤102中根据ISDN号码，确定被叫终端所归属的CSCF网元的位置信息的一种实现方式的流程图可以参阅图2，包括：
步骤1021：向归属位置寄存器HLR或归属用户服务器HSS发起用户数据请求UDR；其中，UDR携带ISDN号码。
步骤1022：接收HLR或HSS发送的用户数据响应UDA；其中，UDA中携带被叫终端的统一资源标志符URI。
步骤1023：根据被叫终端的URI，在DNS服务器查询被叫终端所归属的CSCF网元的位置信息。
本实施例中，通过向HLR或HSS发起携带ISDN号码的UDR，从而得到被叫终端的URI， 以方便备用IP-SM-GW可以根据被叫终端的URI在DNS上准确查询到被叫终端所归属的CSCF网元的位置信息，从而保证主备IP-SM-GW切换过程中，即使不具备IMS域和CS域的双附着的特性，需要收发的短信也能够被正常且准确的收发。
在步骤1021中，备用IP-SM-GW向归属位置寄存器(Home Location Registe，HLR)或归属用户服务器(Home Subscriber Server，HSS)发起的用户数据请求(user data request，UDR)可以理解为用来查询被叫终端的统一资源标志符(Uniform Resource Identifier，URI)。从而，在步骤1022中，HLR或HSS向备用IP-SM-GW返回携带被叫终端的URI的用户数据响应(user data answer，UDA)。
在步骤1023中，备用IP-SM-GW根据被叫终端的URI，在域名系统(Domain Name System，DNS)服务器上查询被叫终端所归属的CSCF网元的位置信息。
在一个实施例中，步骤1023的一种实现方式的流程图可以参阅图3，包括：
步骤301：向DNS服务器发送第一查询指令；其中，第一查询指令携带URI的域名，第一查询指令用于查询被叫终端所归属的CSCF网元的端口号和主机名。
步骤302：接收DNS服务器回复的被叫终端所归属的CSCF网元的端口号和主机名。
步骤303：根据端口号和主机名，查询被叫终端所归属的CSCF网元的位置信息。
本实施例中，备用IP-SM-GW向域名服务器DNS服务器发送携带URI的域名的第一查询指令，能够在DNS服务器上查询到被叫终端所归属的CSCF网元的端口号和主机名，从而根据查询到的端口号和主机名，方便了准确查询被叫终端所归属的CSCF网元的位置信息。
在步骤301中，备用IP-SM-GW向DNS服务器发送的第一查询指令可以为DNS服务器资源(SERVER，SRV)记录查询指令，SRV记录是DNS服务器的数据库中支持的一种资源记录的类型，SRV记录的作用是指明某域名下提供的服务。通过向域名服务器DNS发送DNS SRV记录查询指令，使得DNS能够在接收到该查询指令后，向备用IP-SM-GW返回被叫终端所归属的CSCF网元的端口号PORT和主机名HOST。
在步骤303中，备用IP-SM-GW根据端口号和主机名，查询被叫终端所归属的CSCF网元的位置信息。具体的，备用IP-SM-GW可以向DNS发送第二查询指令，第二查询指令携带主机名，第二查询指令用于查询被叫终端所归属的CSCF网元的IP地址。接收DNS回复的被叫终端所归属的CSCF网元的IP地址，将端口号、主机名和IP地址作为查询到的被叫终端所归属的CSCF网元的位置信息。其中，第二查询指令可以为DNS地址(Address，A)记录查询指令，A记录是用来指定主机名(或域名)对应的IP地址记录。通过向域名服务器DNS发送DNS A记录查询指令，使得DNS能够在接收到该查询指令后，向备用IP-SM-GW返回被叫终端所归属的CSCF网元的IP地址。最终，备用IP-SM-GW得到被叫终端所归属的CSCF网元的端口号、主机名和IP地址，从而可以唯一确定一个CSCF网元。
本实施例中，备用IP-SM-GW通过向HSS、DNS发起一系列请求(比如用户数据请求UDR、第一查询指令、第二查询指令)方便了准确的获取被叫终端所归属的CSCF网元的HOST、IP地址、PORT，最终在IMS域完成信息投递。
在一个实施例中，在步骤102根据ISDN号码，确定被叫终端所归属的CSCF网元的位置信息之前，还包括：查询备用IP-SM-GW中是否缓存有被叫终端的注册信息；其中，注册信息包括：被叫终端所归属的CSCF网元的位置信息。在备用IP-SM-GW未缓存被叫终端的注册信息的情况下，再执行根据ISDN，确定被叫终端所归属的CSCF网元的位置信息。本实 施例中，考虑到备用IP-SM-GW中缓存有被叫终端的注册信息时，可以无需再发起一系列指令去获取被叫终端所归属的CSCF网元的位置信息，因此，在确定备用IP-SM-GW未缓存被叫终端的注册信息的情况下，才执行根据ISDN号码，确定被叫终端所归属的CSCF网元的位置信息的步骤，有利于避免执行不必要的操作。
在一个实施例中，备用IP-SM-GW中包括：业务单元和缓存单元。业务单元，用于完成与工厂自动化的标准工业局域网络(Manufacturing Automation Protocol，MAP)协议、会话初始协议(Session Initiation Protocol，SIP)、Dimeter协议的编解码适配，实现与外部网元的互通。缓存单元，用于缓存用户周期注册信息，实现短信在IMS域的投递。本实施例中，备用IP-SM-GW可以通过业务单元在缓存单元中查询被叫终端的注册信息，以确定是否可以查询到被叫终端的注册信息。从而，在未查询到被叫终端的注册信息，即缓存单元中未缓存被叫终端的注册信息的情况下再执行步骤102。也就是说，本实施例中，备用IP-SM-GW收到终呼请求时，检测到缓存单元中没有缓存被叫终端的注册信息，则IP-SM-GW通过向HSS、DNS发起一系列请求来获取被叫终端所归属的CSCF网元的HOST、IP地址、PORT，最终在IMS域完成投递，保障容灾过程中5G短信的正常收发。
在一个实施例中，终呼请求由短消息中心SMSC向STP发起，在向CSCF网元发送终呼请求之后，还包括：备用IP-SM-GW接收CSCF网元对终呼请求的响应信息，向SMSC回复对终呼请求的响应信息，使得SMSC可以明确发起的终呼请求已被成功响应。
为便于理解使用了本申请实施例中的容灾方法的流程与未使用本申请实施例中的容灾方法的流程之间的区别，下面以一个具体示例对上述两种流程进行说明：
参阅图4，图4为未使用本申请实施例中的容灾方法的情况下，主用IP-SM-GW异常时，各网元之间的交互流程图，包括：
步骤401：SMSC向STP发起终呼请求(包含SRI+MTFWD)，且终呼请求中携带被叫终端的ISDN号码。
步骤402：STP转发终呼请求到主用IP-SM-GW，发现主用IP-SM-GW异常。
步骤403：STP转发终呼请求到备用IP-SM-GW。
步骤404：备用IP-SM-GW的业务单元查询被叫终端的注册信息。
步骤405：备用IP-SM-GW的缓存单元未缓存被叫终端的注册信息，向业务单元返回未缓存被叫终端的注册信息的消息。即，缓存单元向业务单元返回注册信息不存在。
步骤406：备用IP-SM-GW切换被叫到CS域下发，业务单元向HSS或HLR发SRI查询路由信息，携带被叫终端的ISDN。
步骤407：HSS或HLR向备用IP-SM-GW回复查询SRI失败响应。其中，因为5G终端无法附着到CS域，因此HSS或HLR查询SRI失败。
步骤408：备用IP-SM-GW向SMSC回终呼失败响应。
等终端发起周期性注册，缓存单元会保存终端的注册信息，下次终呼时，短信可以从SIP域下发。
参阅图5，图5为使用了本申请实施例中的容灾方法的情况下，主用IP-SM-GW异常时，各网元之间的交互流程图，包括：
步骤501：SMSC向STP发起终呼请求(包含SRI+MTFWD)，且终呼请求中携带被叫终端的ISDN号码。
步骤502：STP转发终呼请求到主用IP-SM-GW，发现主用IP-SM-GW异常。其中，终呼请求包含SRI+M消息。其中，终呼请求包含SRI+MTFWD。
步骤503：STP转发终呼请求到备用IP-SM-GW。其中，终呼请求包含SRI+MTFWD。
步骤504：备用IP-SM-GW的业务单元查询被叫终端的注册信息。
步骤505：备用IP-SM-GW的缓存单元未缓存被叫终端的注册信息，向业务单元返回未缓存被叫终端的注册信息的消息。
步骤506：备用IP-SM-GW的业务单元向HLR或HSS发起UDR，UDR中携带被叫终端的ISDN。
步骤507：HLR或HSS向备用IP-SM-GW回复UDA响应，UDA响应中携带被叫终端的URI。
步骤508：备用IP-SM-GW向DNS服务器发起DNS SRV记录查询指令，DNS SRV记录查询指令中携带被叫终端的URI的域名部分。DNS SRV记录查询指令即图中的DNS SRV。
步骤509：DNS服务器向备用IP-SM-GW回复DNS SRV记录查询响应，DNS SRV记录查询响应中携带CSCF网元的PORT和HOST。DNS SRV记录查询响应即图中的DNS SRV-Ack。
步骤510：备用IP-SM-GW向DNS服务器发起DNS A记录查询指令，DNS A记录查询指令中携带CSCF网元的HOST。DNS A记录查询指令即图中的DNSA。
步骤511：DNS服务器向备用IP-SM-GW回复DNS A记录查询响应，DNS A记录查询响应中携带CSCF网元的IP地址。DNSA记录查询响应即图中的DNS A-Ack。
步骤512：备用IP-SM-GW根据被叫终端的URI、CSCF网元的IP地址、PORT以及HOST向被叫终端所归属的CSCF网元发起终呼请求。其中，终呼请求包含SRI+MTFWD。
步骤513：CSCF网元向备用IP-SM-GW回复终呼响应。
步骤514：备用IP-SM-GW向SMSC回复终呼响应。
通过图4和图5可以看出，如果未采用本申请实施例中的容灾方法，由于5G终端不具有双附着的特性，也就无法从CS域下发，这样就会造成主备IP-SM-GW切换时，5G终端在一小时内可能无法接收短信，直到重新发起周期性注册。而，使用了本申请实施例中的容灾方法，即使5G终端不具备IMS域和CS域的双附着的特性，也可以保证主备IP-SM-GW切换过程中短信的正常收发。
需要说明的是，本申请实施例中的上述各示例均为为方便理解进行的举例说明，并不对本发明的技术方案构成限定。
上面各种方法的步骤划分，只是为了描述清楚，实现时可以合并为一个步骤或者对某些步骤进行拆分，分解为多个步骤，只要包括相同的逻辑关系，都在本专利的保护范围内；对算法中或者流程中添加无关紧要的修改或者引入无关紧要的设计，但不改变其算法和流程的核心设计都在该专利的保护范围内。
本申请实施例还提供了一种容灾系统，如图6所示，包括：STP601、主用IP-SM-GW602、备用IP-SM-GW603和CSCF网元604。
STP601，用于接收终呼请求，并在确定主用IP-SM-GW602异常的情况下，将终呼请求转发至备用IP-SM-GW603；其中，终呼请求中携带被叫终端的综合服务数字网ISDN号码；
备用IP-SM-GW603，用于根据ISDN号码，确定被叫终端所归属的呼叫会话控制功能 CSCF网元的位置信息，并根据CSCF网元的位置信息，向CSCF网元发送终呼请求。
不难发现，本实施例为与上述方法实施例相对应的系统实施例，本实施例可与上述方法实施例互相配合实施。上述方法实施例提到的相关技术细节和技术效果在本实施例中依然有效，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在上述方法实施例中。
本申请实施例还提供了一种容灾装置，如图7所示，包括：接收模块701、确定模块702和发送模块703。
接收模块701，用于接收信令传输节点STP转发的终呼请求；其中，终呼请求由STP确定主用IP-SM-GW异常后转发，终呼请求中携带被叫终端的综合服务数字网ISDN号码。
确定模块702，用于根据ISDN号码，确定被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息。
发送模块703，用于根据CSCF网元的位置信息，向CSCF网元发送终呼请求。
不难发现，本实施例为与上述方法实施例相对应的装置实施例，上述方法实施例提到的相关技术细节和技术效果在本实施例中依然有效，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在上述方法实施例中。
值得一提的是，本实施例中所涉及到的各模块均为逻辑模块，在实际应用中，一个逻辑单元可以是一个物理单元，也可以是一个物理单元的一部分，还可以以多个物理单元的组合实现。此外，为了突出本申请的创新部分，本实施例中并没有将与解决本申请所提出的技术问题关系不太密切的单元引入，但这并不表明本实施例中不存在其它的单元。
本申请实施例还提供了一种备用IP-SM-GW，如图8所示，包括：至少一个处理器801；以及，与至少一个处理器801通信连接的存储器802；其中，存储器802存储有可被至少一个处理器801执行的指令，指令被所述至少一个处理器801执行，以使至少一个处理器801能够执行上述实施例中的容灾方法。
其中，存储器802和处理器801采用总线方式连接，总线可以包括任意数量的互联的总线和桥，总线将一个或多个处理器801和存储器802的各种电路连接在一起。总线还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路连接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口在总线和收发机之间提供接口。收发机可以是一个元件，也可以是多个元件，比如多个接收器和发送器，提供用于在传输介质上与各种其他装置通信的单元。经处理器801处理的数据通过天线在无线介质上进行传输，进一步，天线还接收数据并将数据传送给处理器801。
处理器801负责管理总线和通常的处理，还可以提供各种功能，包括定时，外围接口，电压调节、电源管理以及其他控制功能。而存储器802可以被用于存储处理器801在执行操作时所使用的数据。
本申请实施例还提供了一种计算机可读存储介质，存储有计算机程序。计算机程序被处理器执行时实现上述方法实施例。
即，本领域技术人员可以理解，实现上述实施例方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序存储在一个存储介质中，包括若干指令用以使得一个设备(可以是单片机，芯片等)或处理器(processor)执行本申请各个实施例所述方法的全部 或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-OnlyMemory)、随机存取存储器(RAM，RandomAccessMemory)、磁碟或者光盘等各种可以存储程序代码的介质。
本领域的普通技术人员可以理解，上述各实施方式是实现本发明的具体实施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本发明的精神和范围。

Claims (10)

  1. 一种容灾方法，应用于备用IP短消息网关IP-SM-GW，包括：
    接收信令传输节点STP转发的终呼请求；其中，所述终呼请求由所述STP确定主用IP-SM-GW异常后转发，所述终呼请求中携带被叫终端的综合服务数字网ISDN号码；
    根据所述ISDN号码，确定所述被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息；
    根据所述CSCF网元的位置信息，向所述CSCF网元发送所述终呼请求。
  2. 根据权利要求1所述的容灾方法，其中，所述根据所述ISDN号码，确定所述被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息，包括：
    向归属位置寄存器HLR或归属用户服务器HSS发起用户数据请求UDR；其中，所述UDR携带所述ISDN号码；
    接收所述HLR或所述HSS发送的用户数据响应UDA；其中，所述UDA中携带所述被叫终端的统一资源标志符URI；
    根据所述被叫终端的URI，在域名系统DNS服务器查询所述被叫终端所归属的CSCF网元的位置信息。
  3. 根据权利要求2所述的容灾方法，其中，所述根据所述被叫终端的URI，在域名系统DNS服务器查询所述被叫终端所归属的CSCF网元的位置信息，包括：
    向DNS服务器发送第一查询指令；其中，所述第一查询指令携带所述URI的域名，所述第一查询指令用于查询所述被叫终端所归属的CSCF网元的端口号和主机名；
    接收所述DNS服务器回复的所述被叫终端所归属的CSCF网元的端口号和主机名；
    根据所述端口号和主机名，查询所述被叫终端所归属的CSCF网元的位置信息。
  4. 根据权利要求3所述的容灾方法，其中，所述根据所述端口号和主机名，查询所述被叫终端所归属的CSCF网元的位置信息，包括：
    向所述DNS服务器发送第二查询指令；其中，所述第二查询指令携带所述主机名，所述第二查询指令用于查询所述被叫终端所归属的CSCF网元的IP地址；
    接收所述DNS服务器回复的所述被叫终端所归属的CSCF网元的IP地址；
    将所述端口号、主机名和IP地址作为查询到的所述被叫终端所归属的CSCF网元的位置信息。
  5. 根据权利要求1所述的容灾方法，其中，在所述根据所述ISDN号码，确定所述被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息之前，还包括：
    查询所述备用IP-SM-GW中是否缓存有所述被叫终端的注册信息；其中，所述注册信息包括：所述被叫终端所归属的CSCF网元的位置信息；
    在所述备用IP-SM-GW未缓存所述被叫终端的注册信息的情况下，再执行所述根据所述ISDN，确定所述被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息的步骤。
  6. 根据权利要求1至5任一项所述的容灾方法，其中，所述终呼请求由短消息中心SMSC向所述STP发起，在所述向所述CSCF网元发送所述终呼请求之后，还包括：
    接收所述CSCF网元对所述终呼请求的响应信息；
    向所述SMSC回复对所述终呼请求的响应信息。
  7. 一种容灾系统，包括：STP、主用IP-SM-GW、备用IP-SM-GW和CSCF网元；
    所述STP，用于接收终呼请求，并在确定所述主用IP-SM-GW异常的情况下，将所述终呼请求转发至所述备用IP-SM-GW；其中，所述终呼请求中携带被叫终端的综合服务数字网ISDN号码；
    所述备用IP-SM-GW，用于根据所述ISDN号码，确定所述被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息，并根据所述CSCF网元的位置信息，向所述CSCF网元发送所述终呼请求。
  8. 一种容灾装置，包括：接收模块、确定模块和发送模块；
    所述接收模块，用于接收信令传输节点STP转发的终呼请求；其中，所述终呼请求由所述STP确定主用IP-SM-GW异常后转发，所述终呼请求中携带被叫终端的综合服务数字网ISDN号码；
    所述确定模块，用于根据所述ISDN号码，确定所述被叫终端所归属的呼叫会话控制功能CSCF网元的位置信息；
    所述发送模块，用于根据所述CSCF网元的位置信息，向所述CSCF网元发送所述终呼请求。
  9. 一种备用IP-SM-GW，包括：至少一个处理器；以及，
    与所述至少一个处理器通信连接的存储器；其中，
    所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行如权利要求1至6中任一所述的容灾方法。
  10. 一种计算机可读存储介质，存储有计算机程序，其中，所述计算机程序被处理器执行时实现权利要求1至6中任一所述的容灾方法。
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