CN102480703B - A method of filtering unknown international short messages - Google Patents

Abstract

The invention provides a method for filtering an unknown international short message. Inspection processing is carried out on a mobile terminated forward short message (MT_ForwardSmArg) request message from a foreign short message service center and a routing response message that is sent by a national home location register (HLR) to a foreign country at an international gateway bureau of the local country; when last four numbers of a called global title address of a signal connection control part (SCCP) layer of the MT_ForwardSmArg request message are not four national network authentication number, the short message belongs to an invalid short message and filtering processing is carried out. According to the method for filtering an unknown international short message in the invention, it can be avoided that a domestic service provider is attacked by an invalid unknown international short message; users of the domestic service provider can be secured from interferences of foreign garbage messages, so that the domestic network is safer.

Description

A method of filtering unknown international short messages

technical field

The invention belongs to the field of mobile communication, in particular to a method for filtering unknown international short messages.

Background technique

The short message service is economical, convenient and fast, and is widely used among mobile communication system users. However, this service is often used by some foreign competitors to attack the domestic network and transmit some spam information, which brings troubles to users and damages the interests of domestic operators. Some operators in China have found that they are often attacked by unknown spam messages, which is reflected in the fact that they do not initiate a routing request message (SendRoutingInfoSmArg) to find the Mobile Switching Center (MSC) where the called user of the network is located. A small number of unknown foreign Short Message Service Centers (SMSCs) often send Mobile Terminated Forward Short Message (MT_ForwardSmArg for short) messages directly to the MSC of their own operators. While wasting the operating cost of the operator, the operator often receives complaints from users because the users of the operator often receive such spam messages.

In the short message service of the current mobile communication system, when the MSC receives the MT_ForwardSmArg message carrying the content of the short message, the MSC will send a short message to the called user. If the called user is under the MSC, the short message will be received. information. It can be seen that MSC only passively sends short messages, which provides opportunities for some illegal competitors to easily interfere with domestic networks through spam short messages.

Contents of the invention

In order to solve the technical problem in the prior art that domestic operators cannot shield short messages from foreign unknown SMSCs, the present invention provides a method for filtering illegal and unknown international short messages, so that domestic operators can shield offensive short messages from abroad. information.

The present invention is achieved through the following technical solutions:

A method for filtering unknown international short messages, comprising the following steps:

S1. On the international gateway office of the country, check the received routing response message:

S11. Determine whether the routing response message is a signaling connection control part message;

S12, if the judgment result of the S11 step is yes, then judge whether the calling global code of the signaling connection control part layer is the global code of the country, whether the subsystem number is the home location register, and whether the called global code is a legal foreign code Short message service center, whether the subsystem number is a short message service center;

S13. If the determination results of steps S11 and S12 are yes, then determine whether the routing response message is a mobile application partial routing response message;

S14, if the judgment result of described S11, S12, S13 step is all yes, then dynamically generate 4 domestic network authentication numbers, add 4 at the end of the mobile application part layer where the called user is in the mobile switching center address of the routing response message domestic network authentication number, and then forward the routing response message;

S2. On the international gateway office of the country, check the mobile termination short message request message received:

S21, judging whether the mobile termination short message request message is a signaling connection control part message;

S22, if the judgment result of the S21 step is yes, then judge whether the calling global code of the signaling connection control part layer is a foreign global code, whether the subsystem number is a short message service center, and whether the called global code is a domestic mobile Switching center global code, whether the subsystem number is a mobile switching center;

S23, if the judged result of described S21, S22 step is yes, then judge whether mobile termination short message request message is mobile application part mobile termination short message request message again;

S24, if the judgment result of the steps of S21, S22, and S23 is yes, then the last 4 digits of the called global code of the mobile termination short message request message are consistent with the 4 domestic network authentication numbers dynamically generated sexual comparison;

S25. If the judgment results of steps S21, S22, S23, and S24 are all yes, strip the last 4 digits of the called global code of the mobile termination short message request message, and then forward the mobile termination short message request message.

The method for filtering unknown international short messages provided by the present invention is to check and process the mobile termination short message request message from the foreign short message service center and the routing response message sent to foreign countries by the home location register on the international gateway office of the country. When the last 4 digits of the called global code address of the signaling connection control part layer of the mobile termination short message request message are not 4 domestic network authentication numbers, then the short message belongs to illegal short messages and is filtered. Through the method for filtering unknown international short messages provided by the invention, domestic operators can avoid being attacked by illegal unknown international short messages, and users of domestic operators can avoid interference from foreign spam short messages, making domestic networks more secure.

Description of drawings

Fig. 1 is a schematic flow chart of sending short message signaling by the short message center in the mobile communication system.

FIG. 2 is a schematic diagram of the processing flow of the SendRoutingInfoSmArg message provided by the present invention.

Fig. 3 is a schematic diagram of the processing flow of the MT_ForwardSmArg message provided by the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to shown in Figure 1, if SMSC (Short Message Service Center) will successfully issue MT_ForwardSmArg (mobile termination short message request) message, named as MAP_MT_FORWARD_SHORT_MESSAGE message in Figure 1, then must successfully receive SendRoutingInfoSmRes (routing response) message, Figure 1 1 named MAP_SEND_ROUTING_INFO_FOR_SM_ACK message, if the SendRoutingInfoSmRes message is shielded, the SMSC will not be able to find the location of the called party, and thus cannot send the MT_ForwardSmArg message.

If some illegal SMSCs abandon the process of finding the called route and directly issue the MT_ForwardSmArg message, then the MT_ForwardSmArg message must be blocked directly.

This technology is implemented based on the No. 7 signaling system and is based on the basis of international signaling intercommunication, that is, the signaling intercommunication between foreign operators and domestic operators. Foreign SMSCs can directly query through the SendRoutingInfoSmArg (routing request) message The domestic HLR (Home Location Register, home location register), and the foreign SMSC can directly send the MT_ForwardSmArg message to the domestic MSC.

The technical solution adopted in the present invention is mainly to check the received MT_ForwardSmArg message on the international gateway office of this country: because the SMSC that sends out the illegal MT_ForwardSmArg message abroad often changes the Global Title (Global Title, GT for short, used in the global uniquely identify itself for addressing), or impersonate the GT code of the device of a legal foreign operator. Therefore, in this case, the MT_ForwardSmArg message cannot be filtered according to the calling GT code and the mobile application part (Mobile Application Part, MAP) layer SMSC address.

The invention provides a method for filtering unknown international short messages, which includes the following steps:

S1. On the international gateway office of the country, check the received routing response message (SendRoutingInfoSmRes):

S11, judging whether the routing response message is a Signal Connection Control Part (SCCP for short) message;

S12, if the judgment result of the S11 step is yes, then judge whether the calling global code of the signaling connection control part layer is the global code (GT) of the country, whether the subsystem number is the home location register (HLR), and the called global Whether the code is a legal foreign short message service center (SMSC), whether the subsystem number is a short message service center (SMSC);

S13. If the determination results of the steps S11 and S12 are yes, then determine whether the routing response message is a mobile application partial routing response (MAP SendRoutingInfoSmRes) message;

S14, if the judged result of described S11, S12, S13 step is all yes, then dynamically generate 4 domestic network authentication numbers, mobile switching center (MSC) where the called user is located in the mobile application part (MAP) layer of routing response message ) Add a 4-digit domestic network authentication number to the end of the address, and then forward the routing response message;

S2, on the international gateway office of this country, check the received Mobile Termination Short Message Request (MT_ForwardSmArg) message:

S21, judging whether the Mobile Termination Short Message Request message is a Signaling Connection Control Part (SCCP) message;

S22, if the judging result of described S21 step is yes, then judge whether the signaling connection control part layer calling global code is foreign global code (GT), whether the subsystem number is short message service center (SMSC), called Whether the global code is the domestic mobile switching center global code (MSC GT), whether the subsystem number is the mobile switching center (MSC);

S23, if the judging result of described S21, S22 step is yes, then judge again whether mobile termination short message request message is mobile application part mobile termination short message request message (MAP MT_ForwardSmArg);

S24, if the judgment result of the steps of S21, S22, and S23 is yes, then the last 4 digits of the called global code of the mobile termination short message request message are consistent with the 4 domestic network authentication numbers dynamically generated sexual comparison;

S25. If the judgment results of steps S21, S22, S23, and S24 are all yes, strip the last 4 digits of the called global code of the mobile termination short message request message, and then forward the mobile termination short message request message.

The 4-digit domestic network authentication number is a dynamically randomly generated 4-digit number, and its life cycle and number content are random. After a certain period of time, the 4-digit domestic network authentication number can be changed randomly by itself, so that the The 4-digit domestic network authentication number cannot be obtained and deciphered. The domestic network authentication number of the present invention only needs to meet the following requirements: the forwarded response information carries the domestic network authentication number, so as to realize filtering and comparison of unknown international short messages.

If the judgment result of the called global code in the step S12 is an illegal unknown short message service center address, the routing response message is discarded, that is, the interception process is performed.

If the judgment result of any step in the described S11, S12, S13 step is no, and the judgment result of the called global code is a legal known short message service center address in the step S12, then the routing response message is transparently transmitted Processing, that is, transmission and processing according to the normal process.

If the judgment result of any one of the steps S21, S22, and S23 is no, the mobile termination short message request message is transparently transmitted, that is, transmitted according to a normal process.

If the judging result of said S21, S22, S23 step is all yes, but the judging result of said step S24 is no, then discard this mobile termination short message request message, promptly carry out interception processing.

The reason why the above scheme is adopted is that when sending a short message, the Short Message Service Center (SMSC) first sends a routing request (SendRoutingInfoSmArg) message to the called mobile subscriber's home location register (HLR) to obtain the location of the called mobile subscriber. Mobile Switching Center (MSC), and the HLR will return the MSC address of the called number to the Mobile Application Part (MAP) layer through the routing response (SendRoutingInfoSmRes) message, and the SMSC will use the MAP layer called MSC address of the SendRoutingInfoSmRes message as Mobile terminates the called global code (GT) of the short message request (MT_ForwardSmArg) message, thereby sends the MT_ForwardSmArg message carrying the short message content to the called MSC, and finally the called MSC sends the short message to the called user. Therefore, by intercepting the SendRoutingInfoSmRes message and adding the domestic network authentication number dynamically generated by the international gateway office of the country at the end of the called MSC address at the MAP layer, the called GT code of the legal MT_ForwardSmArg message can carry the domestic network authentication number. Therefore, it can be determined which MT_ForwardSmArg messages need to be restricted, that is, the MT_ForwardSmArg messages sent by SMSCs that have not gone through the routing request process will be blocked.

The above method is applicable to the situation that the domestic operator wants to intercept the illegal MT_ForwardSmArg message sent from the foreign unknown SMSC without going through the process of finding the called party. If the foreign SMSC sends the MT_ForwardSmArg message after going through the process of finding the called party, the illegal SMSC cannot receive the SendRoutingInfoSmRes message when using the legitimate SMSC device GT code or using the illegal device GT code. Call the GT code to filter short messages. When the called GT code of the SendRoutingInfoSmRes message is unknown, the SendRoutingInfoSmRes message is shielded; when the called GT code is a legal SMSC address, it is sent to a legal SMSC. In both cases, the illegal unknown SMSC cannot receive the SendRoutingInfoSmRes message and cannot send the MT_ForwardSmArg message. This function has been completed in step S13 in step S1.

Please refer to Figure 2, all legal foreign SMSC GT code segments are configured in the international gateway office of the country, and all HLR GT code segments in the country are configured as GT code segments because each operator in each country has its own exclusive The assigned GT code segment, such as China Mobile's GT code starts with 86139, and the E.164 encoded GT code contains CC (Country Code) country code (such as China's country code is 86) and NDC (National Destination Code) The domestic destination code (that is, the access code of the operator, such as the access code of China Mobile is 139, 138, etc.), and the last few digits of the GT code are left for the operator to define. When the called GT code (i.e. SMSC code) of the SendRoutingInfoSmRes message intercepted by the international gateway office of this country does not belong to the legal foreign SMSCGT code, at the same time, when the calling GT code (i.e. HLR GT code) is the domestic GT code, the SendRoutingInfoSmRes message is discarded message, thereby indirectly achieving the function of shielding illegal unknown short messages.

Please refer to Figure 3, configure the domestic MSC GT code segment in the international gateway office of the country, and at the same time generate a 4-digit domestic network authentication number periodically according to the random dynamic period of the international gateway office of the country. When the called GT code of the intercepted MT_ForwardSmArg message is When the domestic MSC GT code segment, if the end of the GT code is not a legal domestic network authentication number, then discard the MT_ForwardSmArg message, thereby directly blocking illegal unknown short messages.

The method for filtering unknown international short messages provided by the present invention is to check and process the mobile termination short message request message from the foreign short message service center and the routing response message sent to foreign countries by the home location register on the international gateway office of the country. When the last 4 digits of the called global code address of the signaling connection control part layer of the mobile termination short message request message are not 4 domestic network authentication numbers, then the short message belongs to illegal short messages and is filtered. Through the method for filtering unknown international short messages provided by the invention, domestic operators can avoid being attacked by illegal unknown international short messages, and users of domestic operators can avoid interference from foreign spam short messages, making domestic networks more secure.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (5)

1. filter a method for unknown international short message, it is characterized in that, comprise the following steps:

On S1, home international gateway, the route response message received is checked:

S11, judge whether route response message is SCCP message;

If the judged result that the described S11 of S12 walks is yes, then judge whether SCCP layer caller global title is national global title again, whether Sub-System Number is attaching position register, whether called global code is legal external SMS service center, and whether Sub-System Number is SMS service center;

If the judged result of S13 described S11, S12 step is yes, then judge whether route response message is MAP route response message again;

If the judged result of S14 described S11, S12, S13 step is all yes, then dynamically generate 4 domestic network authentications number, add 4 domestic network authentications number at the end of the mobile application part layering called subscriber place mobile exchange center address of route response message, then forward route response message;

On S2, home international gateway, the Mobile Termination short message request message received is checked:

S21, judge whether Mobile Termination short message request message is SCCP message;

If the judged result that the described S21 of S22 walks is yes, then judge whether SCCP layer caller global title is external global title again, whether Sub-System Number is SMS service center, whether called global code is domestic mobile switching centre global title, and whether Sub-System Number is mobile switching centre;

If the judged result of S23 described S21, S22 step is yes, then judge whether Mobile Termination short message request message is MAP Mobile Termination short message request message again;

If the judged result of S24 described S21, S22, S23 step is yes, then comparison of coherence is carried out at 4, the end of the called global code of this Mobile Termination short message request message and 4 domestic network authentications number of described dynamic generation;

If the judged result of S25 described S21, S22, S23, S24 step is all yes, then by 4, the end stripping of the called global code of Mobile Termination short message request message, then forward Mobile Termination short message request message.

2. the method for filtration unknown international short message according to claim 1, is characterized in that, if the judged result of called global code is illegal unknown SMS service center address in described S12 step, then abandons this route response message.

3. the method for filtration unknown international short message according to claim 1, it is characterized in that, if the judged result of arbitrary step is no in described S11, S12, S13 step, and in S12 step, the judged result of called global code is legal known SMS service center address, then do transparent transmission process to route response message.

4. the method for filtration unknown international short message according to claim 1, is characterized in that, if the judged result of arbitrary step is no in described S21, S22, S23 step, then does transparent transmission process to Mobile Termination short message request message.

5. the method for filtration unknown international short message according to claim 1, is characterized in that, if the judged result of described S21, S22, S23 step is all yes, but the judged result that described S24 walks is no, then abandon this Mobile Termination short message request message.