CN113114855B - Zombie number retrieval method based on IMS call signaling - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H—ELECTRICITY
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- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/2218—Call detail recording
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/2254—Arrangements for supervision, monitoring or testing in networks
Abstract
A zombie number retrieval method based on IMS calling signaling is characterized by comprising the following steps: SBC data mirroring, signaling data capturing and analyzing, call record synthesizing and zombie number retrieval. The invention realizes the real-time retrieval of the zombie number, and the accuracy is greatly improved compared with the CCF ticket mode. The call signaling data capturing, analyzing and synthesizing method is different from a scheme that a general signaling monitoring system captures core network switch signaling data, only SBC network element data is obtained, complex processing processes of data capturing and ticket synthesizing in the general signaling monitoring system are effectively reduced, a ticket synthesizing algorithm is designed for the SBC network element data, and ticket accuracy and ticket generating efficiency are improved.
Description
Technical Field
The invention discloses a zombie number retrieval method based on IMS calling signaling, belonging to the technical field of IMS.
Background
In the prior art, the user of the telephone terminal in the administrative circuit switched network starts to gradually migrate to the IMS administrative switched network. With the evolution of market clients to the administrative switching network to the IMS technology, the switching network develops to a flat construction management mode, the core devices of the administrative switching network are moved upwards in a centralized manner, and the service coverage and the device maintenance amount face a rapid expansion situation, which puts better requirements on the existing operation and maintenance mode and the operation and maintenance technology team construction of the administrative switching network of the headquarter of the market clients.
The administrative exchange network is used as an internal office telephone communication network of a market client, a large number of telephone terminal devices exist, and each terminal telephone device in use is associated with a number. The zombie number is an infrequently used number (for example, an unused number for more than three months), the number occupies a phone terminal device and a core network license, and the associated phone periodically registers and occupies communication resources of the core network and an access network, so that the zombie number occupies software and hardware resources in the IMS administrative switching network, and if more zombie numbers exist in the entire IMS administrative switching network, the IMS resources are greatly wasted. How to efficiently retrieve zombie numbers in the whole IMS administrative switching network can help to know the service condition of the whole network resources, avoid unnecessary resource waste and optimize the software and hardware resource allocation of the whole system.
Compared with a method for judging whether the state of the contact person is abnormal or not through response information and a preset communication protocol corresponding to the response information, the retrieval method based on the signaling data has the advantages that: the data acquisition is comprehensive, all call data can be acquired within a certain time, all data are combed, and the response message method is based on the fact that whether the specified number is normal or not at a specific time is determined; the number judgment flexibility number supports manual configuration of retrieval time and real-time retrieval; the number abnormity judgment accuracy is high, and the reason of the number abnormity is determined by checking the abnormal message types of the core side and the access side based on the standard SIP protocol.
After the administrative switching network is upgraded to the IMS technology, a zombie number retrieval method is commonly used, in which a CCF ticket is analyzed, a call record of the whole IMS network is generated, a telephone call record in a set time period is retrieved, and a zombie number is searched out. The CCF ticket-based mode has the following disadvantages:
(1) The call ticket generation has hysteresis, the call ticket information of the current day can be generated only the next day, and the correspondingly generated call record also has hysteresis;
(2) The ringing of the number is not connected, the ticket record can not be generated, part of the call record information is lost, and the error exists in the number retrieval.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses a zombie number retrieval method based on IMS calling signaling.
Summary of the invention:
the invention realizes the real-time retrieval of the zombie number, and the accuracy is greatly improved compared with the CCF ticket mode. The call signaling data capturing, analyzing and synthesizing method is different from a scheme that a general signaling monitoring system captures core network switch signaling data, only SBC network element data is obtained, complex processing processes of data capturing and ticket synthesizing in the general signaling monitoring system are effectively reduced, a ticket synthesizing algorithm is designed for the SBC network element data, and ticket accuracy and ticket generating efficiency are improved.
The technical scheme of the invention is as follows:
a zombie number retrieval method based on IMS calling signaling is characterized by comprising the following steps: SBC data mirroring, signaling data capturing and analyzing, call record synthesizing and zombie number retrieval;
the SBC data mirror image: all user terminal signaling data of the access network pass through the SBC equipment, the SBC is connected with the IMS-CE, and all call data can be obtained by capturing the IMS-CE and connecting the IMS-CE with an access side port of the SBC;
the signaling data grabbing and analyzing refers to: capturing and analyzing SBC signaling data according to three key parameters of call-ID, calling number and called number; the mainstream signaling monitoring system captures core network switch and SBC signaling data, call record synthesis is usually based on four key parameters of calling number, called number, start time and end time, and a complex synthesis algorithm needs to be designed, the influence of different synthesis algorithms on the synthesis effect of the call record is large, and basically all algorithms have errors;
the method for synthesizing the call records comprises the following steps:
(1) declaring a key value pair storage set, wherein the key is call-ID and the value is the whole call ticket set;
(2) acquiring a call-ID in the signaling data;
(3) judging whether a corresponding key exists in the storage set or not;
(4) if the corresponding key exists, storing the signaling data into a value set corresponding to the key;
(5) if no corresponding key exists, a key/value pair is newly established in the storage set, the key is the call-ID of the signaling, and the value is an empty set;
(6) acquiring all value sets in a storage set, namely synthesized call signaling information;
the synthesized call signaling information is stored in a Mysql database;
the zombie number retrieval comprises the following steps: the definition time of the zombie numbers is preset, and meanwhile, the interval time for searching the zombie numbers is configured.
The invention reads SBC network element signaling in real time, and call records can be generated even if the ringing of the telephone is not answered, thereby effectively solving the problems in the zombie number retrieval method based on the CCF call bill and greatly improving the validity and the instantaneity of zombie number retrieval.
According to the invention, the signaling data grabbing is preferably based on a Pcap library to grab packets.
According to the invention, the detailed steps of the signaling data capture are as follows:
(1) acquiring a network card operation handle of a server, and reading a network adapter data packet;
(2) acquiring a parameter MacIpList in a configuration file sip _ storage.ini, wherein the parameter ip is the ip corresponding to the network card to be captured;
(3) filtering the network card which does not need to be monitored according to the parameter MacIpList in the configuration file;
(4) opening the network equipment according to the acquired server network card operation handle;
(5) configuring a network type and filtering character strings;
(6) binding the filtering character string to the opened network card;
(7) executing packet grabbing;
(8) performing signaling data parsing;
(9) and finishing calling the network card operation handle and releasing the memory resource applied during calling.
According to the invention, the detailed steps of the signaling packet capture data analysis are as follows:
(1) checking whether the length of the message is within a preset length; preferably, the invention checks whether the length of the message is within 20-1800;
(2) the SIP message must begin with capital letters;
(3) check the first line for the character "SIP/2.0";
(4) check the Cseq attributes for any of the following strings INVITE, ACK, BYE, CANCEL, PRACK, INFO, UPDATE: if one of the character strings exists, putting the character string into a ring queue to be analyzed;
(5) the analysis thread acquires an SIP signaling data packet from the annular queue;
(6) according To call-ID, the called party group of calling party is recorded into a linked list, call-ID is used as key word, from attribute and To attribute are combined To be used as a node, a session ID corresponds To a plurality of nodes, analysis is carried out after the call loop is confirmed, and the numbers at two ends are found To be both parties of real call;
(7) detecting overtime in the period, and if one session exceeds 2 hours or ringing time is more than 60 seconds, recording as an overtime session;
(8) and calling a storage thread according to a certain time interval and the number of the stored sessions to store the call signaling into a database according to the date and the time, and dividing the table into different tables according to the time periods by the database.
Preferably according to the present invention, the call record composition further comprises:
for the same call record: the call-ID of an outlet at an SBC access side is a unique mark, a From field number and a To field number of a registration signaling message are the same, a number in a From field of a calling signaling message is a calling phone number, a number in a To field is a called phone number, and the same data of the calling number and the called number in all captured signaling data is the registration signaling message and is not treated as the calling signaling message;
in the calling signaling message, call-ID is the same, calling number is the same, and the signaling message with the same called number is classified into the same calling record as the signaling message to be synthesized of the same calling record.
Preferably according to the present invention, the call record composition further comprises: the signaling information to be synthesized is stored according to a date sub-table, and each call signaling record includes but is not limited to: calling number, called number, starting time, response time, ending time, call duration, source IP, target IP and signaling state field information.
According to the present invention, preferably, the zombie number retrieval specifically includes:
1) Finding out the number with the registration time being longer than the definition time of the preset zombie number from the address list, and traversing;
2) Inquiring whether each number in the previous step has a call record within the definition time of the preset zombie number by using a date sub-table middleware;
3) And refreshing the state of the number in the address book according to the result, namely determining whether the number is a zombie number.
According to the invention, in the zombie number retrieval, in the step 2), the user can manually retrieve whether each number in the step 1) has a call record in real time.
The invention has the beneficial technical effects that:
the zombie number combing method based on IMS calling signaling can be embodied from three aspects of timeliness, accuracy and flexibility:
1. in the timeliness aspect, the traditional call ticket acquiring call signaling data method cannot generate the call ticket data in the same day, can acquire call signaling information in real time based on the call signaling method, and can generate the call signaling information only when ringing but not talking.
2. Compared with the traditional signaling monitoring system based on the calling number, the called number, the starting time and the ending time, the accuracy of the method based on the Call-id is greatly improved.
3. In the aspect of flexibility, the method can be manually configured, supports automatic regular retrieval and can also be manually retrieved in real time.
Drawings
FIG. 1: IMS port mirror image schematic diagram;
FIG. 2 is a drawing: a schematic diagram of signaling data grabbing and analyzing;
FIG. 3: call record synthesis and zombie number retrieval schematic diagram;
FIG. 4 is a drawing: key parameters are exemplified in embodiments of the invention.
Detailed Description
The invention is described in detail below with reference to the following examples and drawings, but is not limited thereto.
Examples 1,
The zombie number retrieval method based on the IMS calling signaling is applied to power companies in Hebei provinces of the national network, and according to user feedback, the zombie number retrieval method based on the IMS calling signaling is more flexible and efficient than the conventional zombie number retrieval method based on CCF (content centric feature) telephone bills, and good evaluation is consistently given.
As shown in figures 1, 2 and 3. The zombie number retrieval method based on the IMS calling signaling comprises the following steps: SBC data mirroring, signaling data capturing and analyzing, call record synthesizing and zombie number retrieval;
the SBC data mirror image: all user terminal signaling data of the access network passes through SBC equipment, the SBC is connected with IMS-CE, and all call data can be acquired by capturing the IMS-CE and connecting with an access side port of the SBC; the SBC is a network element at the edge of the IMS network for implementing IP access, interworking, and security protection, exists between an access network and the IMS network or between different IMS networks, and is an entry point for a user to access the IMS, and the SBC serves as a B2BUA to isolate the user from the IMS core network; IMS port mirroring as in fig. 1;
the signaling data grabbing and analyzing refers to: capturing and analyzing SBC signaling data according to three key parameters of call-ID, calling number and called number;
the method for synthesizing the call records comprises the following steps:
(1) declaring a key value pair storage set, wherein the key is call-ID and the value is the whole call ticket set;
(2) acquiring a call-ID in the signaling data;
(3) judging whether a corresponding key exists in the storage set or not;
(4) if the corresponding key exists, storing the signaling data into a value set corresponding to the key;
(5) if no corresponding key exists, a key/value pair is newly established in the storage set, the key is the call-ID of the signaling, and the value is an empty set;
(6) acquiring all value sets in a storage set, namely the synthesized call signaling information;
the synthesized call signaling information is stored in a Mysql database;
the zombie number retrieval comprises: the definition time of the zombie numbers is preset, in the embodiment, the call records which do not occur in three months are the zombie numbers, and the interval time for searching the zombie numbers is configured.
As shown in fig. 2. The signaling data capturing is based on the Pcap library for packet capturing.
The detailed steps of the signaling data capture are as follows:
(1) acquiring a network card operation handle of a server, and reading a network adapter data packet;
(2) acquiring a parameter MacIList in a configuration file sip _ storage.ini, wherein the parameter ip is a network card corresponding to a network card to be captured;
(3) filtering the network card which does not need to be monitored according to the parameter MacIpList in the configuration file;
(4) opening the network equipment according to the acquired server network card operation handle;
(5) configuring a network type and a filtering character string;
(6) binding the filtering character string to the opened network card;
(7) executing packet grabbing;
(8) performing signaling data parsing;
(9) and finishing calling the operation handle of the network card and releasing the memory resource applied during calling.
The detailed steps of the signaling packet capturing data analysis are as follows:
(1) checking whether the message length is within 20-1800;
(2) the SIP message must begin with capital letters;
(3) check the first line for the character "SIP/2.0";
(4) check Cseq attributes for any of the following strings INVITE, ACK, BYE, CANCEL, PRACK, INFO, UPDATE: if one of the character strings exists, putting the character string into a ring queue to be analyzed;
(5) the analysis thread acquires an SIP signaling data packet from the annular queue;
(6) according To call-ID, the called party of the calling party is grouped and recorded into a linked list, the call-ID is used as a keyword, a combination of From attribute and To attribute is used as a node, one session ID corresponds To a plurality of nodes, and after the call loop is confirmed, analysis is carried out To find numbers at two ends, namely, the two parties of a real call;
(7) detecting overtime in the period, and if one session exceeds 2 hours or ringing time is more than 60 seconds, recording as an overtime session;
(8) and calling a storage thread according to a certain time interval and the number of the stored sessions to store the call signaling into a database according to the date and the time, and dividing the table into different tables according to the time periods by the database.
Example code:
the call record composition further comprises:
aiming at the algorithm synthesis defect of the signaling monitoring system, the method provides a synthesis algorithm for capturing SBC signaling data only from the practical aspect of only obtaining call records and according to three key parameters of call-ID, calling number and called number, the method has small data processing amount and hundred percent of synthesis accuracy. An example of the key parameters is shown in fig. 4.
For the same call record: the call-ID of an outlet on an SBC access side is a unique mark, the From field number and the To field number of the registration signaling message are the same, the number in the From field of the calling signaling message is a calling phone number, the number in the To field is a called phone number, and the data with the same calling number and the same called number in all captured signaling data is the registration signaling message and is not treated as the calling signaling message;
in the calling signaling message, call-ID is the same, calling number is the same, and the signaling message with the same called number is classified as the same calling record and used as the signaling information to be synthesized of the same calling record.
The call record composition further comprises: the signaling information to be synthesized is stored according to a date sub-table, and each call signaling record includes but is not limited to: calling number, called number, starting time, response time, ending time, call duration, source IP, target IP and signaling state field information.
The zombie number retrieval specifically comprises the following steps:
1) Finding out the number with the registration time being longer than the definition time of the preset zombie number from the address list, and traversing;
2) Inquiring whether each number in the last step has a call record within the definition time of the preset zombie number by using a date sub-table middleware;
3) And refreshing the state of the number in the address book according to the result, namely determining whether the number is a zombie number.
Preferably, in the zombie number retrieval, in step 2), the user may also manually retrieve whether each number in step 1) has a call record in real time.
In the province of Hebei network, the method of the invention has the corresponding functions, the zombie number retrieval mode is reduced to about 5 minutes from the original one day compared with the retrieval mode of CCF telephone bill, the call records with the unconnected ringing are successfully retrieved, and the synthesis rate of the call records reaches more than 99%.
Claims (5)
1. A zombie number retrieval method based on IMS calling signaling is characterized by comprising the following steps: SBC data mirroring, signaling data capturing and analyzing, call record synthesizing and zombie number retrieval;
the SBC data mirroring: all user terminal signaling data of the access network passes through SBC equipment, the SBC is connected with IMS-CE, and all call data can be acquired by capturing the IMS-CE and connecting with an access side port of the SBC;
the signaling data grabbing and analyzing refers to: capturing and analyzing SBC signaling data according to three key parameters of call-ID, calling number and called number;
the method for synthesizing the call records comprises the following steps:
(1) declaring a key value pair storage set, wherein the key is call-ID and the value is the whole call ticket set;
(2) acquiring a call-ID in the signaling data;
(3) judging whether a corresponding key exists in the storage set or not;
(4) if the corresponding key exists, storing the signaling data into a value set corresponding to the key;
(5) if no corresponding key exists, a key/value pair is newly established in the storage set, the key is the call-ID of the signaling, and the value is an empty set;
(6) acquiring all value sets in a storage set, namely the synthesized call signaling information;
the synthesized call signaling information is stored in a Mysql database;
the zombie number retrieval comprises: presetting definition time of zombie numbers, and simultaneously preparing interval time for searching the zombie numbers;
the signaling data capturing is packet capturing based on a Pcap library, and the detailed steps of the signaling data capturing are as follows:
(1) acquiring a network card operation handle of a server, and reading a network adapter data packet;
(2) acquiring a parameter MacIpList in a configuration file sip _ storage.ini, wherein the parameter ip is the ip corresponding to the network card to be captured;
(3) filtering the network card which does not need to be monitored according to the parameter MacIList in the configuration file;
(4) opening the network equipment according to the acquired server network card operation handle;
(5) configuring a network type and a filtering character string;
(6) binding the filtering character string to the opened network card;
(7) executing packet grabbing;
(8) performing signaling data parsing;
(9) finishing calling the network card operation handle, and releasing the memory resource applied during calling;
the detailed steps of the signaling packet capturing data analysis are as follows:
(1) checking whether the length of the message is within a preset length;
(2) the SIP message must begin with capital letters;
(3) check the first line for the character "SIP/2.0";
(4) check Cseq attributes for any of the following strings INVITE, ACK, BYE, CANCEL, PRACK, INFO, UPDATE: if one of the character strings exists, putting the character string into a ring queue to be analyzed;
(5) the analysis thread acquires an SIP signaling data packet from the annular queue;
(6) according To call-ID, the called party of the calling party is grouped and recorded into a linked list, the call-ID is used as a keyword, a combination of From attribute and To attribute is used as a node, one session ID corresponds To a plurality of nodes, and after the call loop is confirmed, analysis is carried out To find numbers at two ends, namely, the two parties of a real call;
(7) detecting overtime in the period, and if one session exceeds 2 hours or the ringing time is more than 60 seconds, recording as the overtime session;
(8) and calling a storage thread according to a certain time interval and the number of the stored sessions to store the call signaling into a database according to the date and the time, and dividing the table into different tables according to the time periods by the database.
2. The method of claim 1, wherein the synthesizing of the call record further comprises:
for the same call record: the call-ID of an outlet on an SBC access side is a unique mark, the From field number and the To field number of the registration signaling message are the same, the number in the From field of the calling signaling message is a calling phone number, the number in the To field is a called phone number, and the data with the same calling number and the same called number in all captured signaling data is the registration signaling message and is not treated as the calling signaling message;
in the calling signaling message, call-ID is the same, calling number is the same, and the signaling message with the same called number is classified as the same calling record and used as the signaling information to be synthesized of the same calling record.
3. The method of claim 2, wherein the call record synthesis further comprises: the signaling information to be synthesized is stored according to a date sub-table, and each call signaling record includes but is not limited to: calling number, called number, starting time, response time, ending time, call duration, source IP, target IP and signaling state field information.
4. The method of claim 1, wherein the zombie number retrieval based on the IMS call signaling specifically comprises:
1) Finding out the number with the registration time being longer than the definition time of the preset zombie number from the address list, and traversing;
2) Inquiring whether each number in the previous step has a call record within the definition time of the preset zombie number by using a date sub-table middleware;
3) And refreshing the state of the number in the address book according to the result, namely determining whether the number is a zombie number.
5. The method as claimed in claim 4, wherein in the zombie number retrieval, in step 2), the user can manually retrieve whether there is a call record for each number in step 1) in real time.
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| CN106850318A (en) * | 2017-03-27 | 2017-06-13 | 国网山东省电力公司信息通信公司 | The visualization of IMS signaling processes represents system, method and server |
| CN110430102A (en) * | 2019-09-02 | 2019-11-08 | 国网江苏省电力有限公司丹阳市供电分公司 | Call recording method based on IMS |
| CN110620849A (en) * | 2019-09-16 | 2019-12-27 | 南京南瑞信息通信科技有限公司 | Centralized sorting method and system for IMS telephone terminal call records |
| CN212305377U (en) * | 2019-11-11 | 2021-01-05 | 北京中电飞华通信股份有限公司 | IMS office service system |
| CN110912885A (en) * | 2019-11-21 | 2020-03-24 | 国网江苏省电力有限公司信息通信分公司 | Method and system for instantly notifying missed calls of multiple accounts in IMS network |
| CN111988199A (en) * | 2020-08-04 | 2020-11-24 | 国网山东省电力公司信息通信公司 | IMS (IP multimedia subsystem) signaling analysis system and method for power switching network |
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