KR101142387B1 - Apparatus and Method for Spam Blocking in VoIP Environment - Google Patents

Abstract

The present invention relates to a method for efficiently managing and blocking spam calls received from the outside, and more particularly, a method for checking whether or not spam is received from an external device in a separate device and blocking a call connection in case of a spam call. It is about.
To this end, a method for processing a call connection request received from an external terminal in a VoIP gateway managing at least one internet terminal including a representative internet terminal of the present invention includes a SIP 302 temporary movement (302) to the external terminal requesting a call to the internet terminal. Instructing a transfer of a call connection request to the representative Internet terminal by carrying a Moved Temporarily message and the representative telephone number to be transferred in a contact header of the message, and making a call connection from the external terminal to the representative Internet terminal. When the request is made, requesting the external terminal to input an extension number of an internet terminal to which an actual call is to be connected. When the requested extension number is input by the external terminal, a call is connected between the external terminal and the internet terminal. It includes a step.

Description

Apparatus and Method for Spam Blocking in VoIP Environment}

The present invention relates to a method for efficiently managing and blocking spam calls received from the outside in a VoIP environment using the SIP protocol, and more particularly, to determine whether spam received from an external device in a separate device and spam calls It is about the method of blocking call connection.

With the rapid development of internet communication technology, the spread of internet terminal (VoIP) based on internet network is increasing. In proportion to this, Internet terminal spam, which attempts to unilaterally provide unsolicited information, has also become a problem. Conventionally, various methods for blocking Internet terminal spam have been proposed, but the reality is that each has a problem.

The content filtering method is a general form of spam countermeasure used in e-mail spam and grasps the content of the content to filter spam information. However, in the case of the Internet terminal, the contents of the content cannot be understood until the user or the Internet terminal service provider receives the call. In addition, there are various methods for voice transmission on the Internet terminal, and if the content is voice and video, voice and video recognition technology is not sophisticated until now, it is difficult to analyze whether the content is spam or not.

The blacklist-based approach lists spammers' addresses and blocks spam by address mapping. In general, Internet terminal spam blocking through blacklist management is a method of blocking Internet terminal spammers (hereinafter referred to as spammers). Therefore, if a registered spammer is a normal user, it cannot provide a solution to the problem. There is no provision for effective renewal. In addition, since blacklist management is centrally maintained by the server, it does not reflect the characteristics of Internet terminal users.

The whitelist-based approach accepts only valid users' email, as opposed to blacklisting. In this method, however, a valid sender cannot communicate with the user because it is not on the whitelist.

In the consent-based communication method, when user A communicates with B, the initial communication process is rejected and requests consent because there is no information about A in B's black or white list. Later, when A tries to communicate with B again, B knows that A has attempted to communicate before and accepts or rejects A's request. Such consent-based systems appear to be effective for telephone systems, but only change the fundamental characteristics of spam. In other words, it can prevent receiving unnecessary information through the contents of spam, but it can not prevent annoying people by requesting consent.

The problem to be solved by the present invention proposes a method for efficiently identifying whether a telephone received from the outside in the VoIP environment is a spam call using the SIP protocol.

The problem to be solved by the present invention proposes a method of reducing the load of the Internet terminal included in a specific group by blocking the call connection when the incoming call is a spam call.

The problem to be solved by the present invention proposes a method for determining whether a spam call while minimizing the rejection of the user of the external telephone.

To this end, a method for processing a call connection request received from an external terminal in a VoIP gateway managing at least one Internet terminal including a representative Internet terminal of the present invention in a VoIP environment using a SIP protocol includes: Instructing a terminal to switch a call connection request to the representative Internet terminal by carrying a SIP 302 Moved Temporarily message and the representative telephone number to be transferred in a contact header of the message; Requesting a call connection from the external terminal to the representative internet terminal, requesting an extension number of the internet terminal to which an actual call is to be connected to the external terminal, and if the requested extension number is input by the external terminal, the external terminal And connecting the call between the Internet terminal.

To this end, a device for processing a call connection request received from an external terminal in a VoIP gateway managing at least one internet terminal including a representative internet terminal of the present invention may move the SIP 302 to the external terminal requesting a call to the internet terminal. A Moved Temporarily message and the representative telephone number to be transferred to the contact header of the message are instructed to instruct a call connection request to the representative Internet terminal to transfer the call connection request from the external terminal to the representative Internet terminal. If requested, the controller requesting the external terminal to input the extension number of the Internet terminal to which the actual call is to be connected and the requested extension number are input by the external terminal, and the external terminal and the Internet are instructed by the controller. It includes a call forwarding unit for connecting the call between the terminals.

To this end, the present invention transfers a SIP 302 Moved Temporarily message and a Contact Header of the message to at least one Internet terminal including a representative Internet terminal and the external terminal requesting a call to the Internet terminal. Instructing the representative Internet terminal to switch the call connection request by carrying the representative phone number, and when the call connection is requested from the external terminal to the representative Internet terminal, inputting the extension number of the Internet terminal to which the actual call is to be connected. A call connection system comprising a VoIP gateway requesting a terminal is proposed.

As described above, the present invention can prevent spam calls from being connected to Internet terminals of a group including a VoIP gateway by checking whether an external terminal that attempts to connect a call from a VoIP gateway in a VoIP environment using the SIP protocol is connected. Will be.

In addition, the present invention can minimize the rejection of the user of the external terminal by requesting the VoIP gateway to manipulate the extension number of the Internet terminal attempting the initial connection to the external terminal attempting to connect. That is, the VoIP gateway requests the external terminal user to input the extension number of the Internet terminal attempting to connect for the first time, so that the external terminal user inputs the extension number. However, when the external terminal is unable to enter the extension number by the user, the VoIP gateway can effectively manage spam calls by blocking the call connection.

1 illustrates a VoIP network structure including a plurality of Internet terminals according to an embodiment of the present invention.
2 is a SIP message flow diagram for processing to check whether an external telephone is spam in a VoIP gateway according to an embodiment of the present invention.
3 is another SIP message flow diagram for processing to check whether an external telephone is spam in a VoIP gateway according to an embodiment of the present invention.
4 is a block diagram showing the configuration of a VoIP gateway according to an embodiment of the present invention.

The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter will be described in detail to enable those skilled in the art to easily understand and reproduce through this embodiment of the present invention.

In the past, H.323 was widely used as a call control protocol of VoIP, but SIP (Session Initiation Protocol) is the trend. SIP is a protocol for VoIP call signaling that supports call connection, call termination, call transfer, etc. as defined by IETF RFC3261. Since SIP is a text-based protocol, it has the advantage of being scalable and easy to implement.

1 illustrates a VoIP network structure including a plurality of Internet terminals according to an embodiment of the present invention. Hereinafter, a VoIP network structure including a plurality of Internet terminals according to an embodiment of the present invention will be described in detail with reference to FIG. 1.

According to FIG. 1, the VoIP network structure includes a plurality of Internet terminals, a VoIP gateway 120, and an Internet network 130. The plurality of Internet terminals are connected to the VoIP gateway 120, and the VoIP gateway 120 is connected to an external telephone using the Internet network 130.

The plurality of Internet terminals form one group, and one of the Internet terminals forming one group is assigned a representative number (account) of the group. Table 1 shows an example of telephone numbers assigned to Internet terminals forming one group.

Terminal Phone number (VoIP account) Internet terminal 1 070-1234-AAAA Internet terminal 2 070-1234-BBBB ... ... Representative Internet Terminal 070-1234-NNNN

According to Table 1, the Internet terminal 1 110 is assigned a telephone number 070-1234-AAAA, the Internet terminal 2 112 is assigned a telephone number 070-1234-BBBB, the representative Internet terminal 114 is Phone number 070-1234-NNNN is assigned.

In the context of the present invention, an external telephone requesting a call to an internet terminal constituting a corresponding group through an internet network is via the VoIP gateway 120. Therefore, the present invention proposes a method of identifying and processing spam of an external telephone using the VoIP gateway 120.

2 is a flowchart of a SIP message for processing to check whether an external terminal 200 is spam in a VoIP gateway 120 according to an embodiment of the present invention. Hereinafter, a process of checking and processing spam by the external terminal 200 in the VoIP gateway 120 according to an embodiment of the present invention will be described with reference to FIG. 2.

2 includes an external telephone, VoIP gateway 120 and external terminal 200. Of course, Figure 2 is apparent that other configurations may be included in addition to the above-described configuration.

1. The external terminal (010-1234-5678) requests a call to the Internet terminal 1 (110). As described above, since the telephone number of the Internet terminal 1 110 is 070-1234-AAAA, the external terminal 200 calls 070-1234-AAAA. In this case, the call connection requested by the external terminal 200 is relayed by the VoIP gateway 120. The following is a SIP message expressing this.

[External terminal requests call to 070-1234-AAAA number]

INVITE tel: 0701234AAAA SIP / 2.0Via: SIP / 2.0 / UDP 10.6.6.6:5060; branch = z9hG4bKQptgFrYILoygXLsxp

From: <sip: 01012345678@openstack.com>; tag = d3OJXsN

To: <tel: 070-1234-AAAA>

Call-ID: yz5b6KZmcK8r6beUzmRf6Ci6nx8dyD

CSeq: 1 INVITE

Max-Forwards: 70

Contact: <sip: 01012345678 @ 10.6.6.6>

Allow: ACK, BYE, CANCEL, INFO, INVITE, MESSAGE, NOTIFY, OPTIONS, PRACK, REFER, REGISTER, SUBSCRIBE, UPDATE

Content-Type: application / sdp

Supported: timer, 100rel

User-Agent: Open Stack UA

Content-Length: 234

v = 0o =-1271821406609375 1 IN IP4 10.6.6.6s = -c = IN IP4 10.6.6.6t = 0 0

m = audio 5770 RTP / AVP 0 8 96

2. The VoIP gateway 120 requests to switch to the representative Internet terminal 114 in response to the call request of the external terminal 200. That is, the VoIP gateway 120 instructs the external terminal 200 to request a call to 070-1234-NNNN, which is the telephone number of the representative Internet terminal 114, instead of 070-1234-AAAA.

[VoIP gateway requests external terminal to transfer to 070-1234-NNNN number]

SIP / 2.0 302 Moved Temporarily

Via: SIP / 2.0 / UDP openstack.com:5060;branch=z9hG4bKbf9f44;received=10.6.6.6

From: <sip: 0701234AAAA@openstack.com>; tag = d3OJXsN

To: <sip: 01012345678@openstack.com>; tag = 53fHlqlQ2

Call-ID: yz5b6KZmcK8r6beUzmRf6Ci6nx8dyD

Contact: <sip: 0701234NNNN @ 10.6.6.6>

CSeq: 1 INVITE

3. The external terminal 200 requests a call to 070-1234-NNNN instead of 070-1234-AAAA according to the instruction of the VoIP gateway 120.

[External terminal requests call to 070-1234-NNNN]

INVITE tel: 0701234NNNN SIP / 2.0Via: SIP / 2.0 / UDP 10.6.6.6:5060; branch = z9hG4bKQptgFrYILoygXLsxp

From: <sip: 01012345678@openstack.com>; tag = d3OJXsN

To: <tel: 0317897976>

Call-ID: yz5b6KZmcK8r6beUzmRf6Ci6nx8dyD

CSeq: 1 INVITE

Max-Forwards: 70

Contact: <sip: 01012345678 @ 10.6.6.6>

Allow: ACK, BYE, CANCEL, INFO, INVITE, MESSAGE, NOTIFY, OPTIONS, PRACK, REFER, REGISTER, SUBSCRIBE, UPDATE

Content-Type: application / sdp

Supported: timer, 100rel

User-Agent: Open Stack UA

Content-Length: 234

v = 0o =-1271821406609375 1 IN IP4 10.6.6.6s = -c = IN IP4 10.6.6.6t = 0 0

m = audio 5770 RTP / AVP 0 8 96

[Call is connected between external terminal and representative terminal 070-1234-NNNN]

SIP / 2.0 200 OK

Via: SIP / 2.0 / UDP 10.6.6.6:5060; branch = z9hG4bKQptgFrYILoygXLsxp

From: <sip: 0701234NNNN@openstack.com>; tag = 1234567

To: <tel: 01012345678>

Call-ID: 12345601

CSeq: 1 INVITE

Contact: <sip: 0701234NNNN@openstack.com>

Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY

Supported: replaces

Content-Type: application / sdp

Content-Length: ...

v = 0

o =-2890844527 2890844527 IN IP4 10.6.6.6

s =

c = IN IP4 10.6.6.6

t = 0 0

m = audio 3456 RTP / AVP 0

a = rtpmap: 0 PCMU / 8000

4. The VoIP gateway 120 requests the input of AAAA, which is the extension number of the Internet terminal 1110, to the external terminal 200 requesting a call to 070-1234-NNNN. Request input by playing a pre-recorded word.

5. The external terminal 200 inputs AAAA which is the extension number of the Internet terminal 1110 according to the extension number of the VoIP gateway 120. The entered number can be conveyed in a way by DTMF or RFC2833.

6. The VoIP gateway 120 receiving the AAAA, the extension number of the Internet terminal 1110 from the external terminal 200, transfers the call to 070-1234-AAAA.

[Request external device to transfer to 070-1234-AAAA]

REFER sip: 01012345678@openstack.com SIP / 2.0

Via: SIP / 2.0 / UDP 10.6.6.6:5060; branch = z9hG4bKQptgFrYILoygXLsxp

Max-Forwards: 70

From: <sip: 0701234NNNN@openstack.com>; tag = 1234567

To: <tel: 01012345678>; tag = 314159

Call-ID: 12345601

CSeq: 101 REFER

Refer-To: <sip: 0701234AAAA@openstack.com>

Referred-By: <0701234NNNN@openstack.com>

Contact: <sip: 0701234NNNN@10.6.6.6>

Content-Length: 0

[External terminal performs call transfer to 070-1234-AAAA number]

INVITE tel: 0701234AAAA SIP / 2.0Via: SIP / 2.0 / UDP 10.6.6.6:5060; branch = z9hG4bKQptgFrYILoygXLsxp

From: <sip: 01012345678@openstack.com>; tag = d3OJXsN

To: <tel: 0701234AAAA>

Call-ID: yz5b6KZmcK8r6beUzmRf6Ci6nx8dyD

CSeq: 1 INVITE

Max-Forwards: 70

Contact: <sip: 01012345678 @ 10.6.6.6>

Allow: ACK, BYE, CANCEL, INFO, INVITE, MESSAGE, NOTIFY, OPTIONS, PRACK, REFER, REGISTER, SUBSCRIBE, UPDATE

Content-Type: application / sdp

Supported: timer, 100rel

User-Agent: Open Stack UA

Content-Length: 234

v = 0o =-1271821406609375 1 IN IP4 10.6.6.6s = -c = IN IP4 10.6.6.6t = 0 0

m = audio 5770 RTP / AVP 0 8 96

7. In accordance with the call transfer of the VoIP gateway 120, the Internet terminal 1 110 receives a call connection request from the external terminal 200, and attempts a call if necessary.

As described above, according to the present invention, the VoIP gateway 120 manages a call request received from the outside, thereby reducing spam that is connected to an Internet terminal included in a specific group. Of course, the VoIP gateway 120 manages the blacklist or the whitelist, so that the outgoing telephone number included in the blacklist blocks the call without additional processing, and the outgoing telephone number included in the whitelist is received without additional processing. The call can be connected to an Internet terminal having a number.

As described above, the present invention requests the caller to input the incoming call once more, thereby reducing the caller's rejection. However, the machine device requesting the call connection cannot effectively enter an extension number, thereby effectively blocking spam calls.

3 illustrates a case in which the external terminal 200 according to an embodiment of the present invention cannot input an extension number. Hereinafter, a case in which the external terminal 200 cannot input an extension number will be described in detail with reference to FIG. 3.

1. The external terminal 200 requests a call to the Internet terminal 1 (110). As described above, since the telephone number of the Internet terminal 1 110 is 070-1234-AAAA, the external terminal 200 calls 070-1234-AAAA. In this case, the call connection requested by the external terminal 200 is relayed by the VoIP gateway 120.

2. The VoIP gateway 120 requests to switch to the representative Internet terminal 114 in response to the call request of the external terminal 200. That is, the VoIP gateway 120 instructs the external terminal 200 to request a call to 070-1234-NNNN, which is the telephone number of the representative Internet terminal 114, instead of 070-1234-AAAA.

3. The external terminal 200 requests a call to 070-1234-NNNN instead of 070-1234-AAAA according to the instruction of the VoIP gateway 120.

4. The VoIP gateway 120 requests the input of AAAA, which is the extension number of the Internet terminal 1110, to the external terminal 200 requesting a call to 070-1234-NNNN.

5. If the extension number is not input for the set time, the VoIP gateway 120 blocks the call connection requested by the external terminal 200.

[End call if extension number doesn't match]

BYE sip: 01012345678@10.6.6.6 SIP / 2.0Via: SIP / 2.0 / UDP 125.144.42.100:5080;branch=z9hG4bK-d8754z-3217b86ca1cda56a-1---d8754z-;rportMax-Forwards: 68Contact: <sip: 125.144. 42.100; transport = UDP> To: <sip: 01012345678@openstack.com>; tag = d3OJXsNFrom: <tel: 0701234NNNN>; tag = f3593d32_6028_5274b7013a37Call-ID: yz5b6KZmcK8r6beUzmRf6Ci6N8dyDContent:

SIP / 2.0 200 OKVia: SIP / 2.0 / UDP 125.144.42.100; branch = z9hG4bK-d8754z-3217b86ca1cda56a-1 --- d8754z-; rportFrom: <tel: 0701234NNNN>; tag = f3593d32_6028_5274b7013a37To: <sip: 01012345678 @ >; tag = d3OJXsNCall-ID: yz5b6KZmcK8r6beUzmRf6Ci6nx8dyDCSeq: 10002 BYEContent-Length: 0

As described above, the VoIP gateway 120 performs call connection or call blocking based on DTMF input of a call connection requested from an external machine.

4 is a block diagram showing the configuration of the VoIP gateway 120 according to an embodiment of the present invention. Hereinafter, the structure of the VoIP gateway 120 according to an embodiment of the present invention will be described with reference to FIG. 4.

According to FIG. 4, the VoIP gateway 120 includes a controller 400, a receiver 404, a storage 406, and a call forwarding unit 402. Obviously, other configurations than the above-described configuration may be included in the VoIP gateway 120.

The storage unit 406 stores control information and other necessary information for driving the VoIP gateway 120. In addition, the storage unit 406 stores the Internet terminal and the telephone number (account) of the Internet terminal included in the group. The storage unit 406 stores a black list and a white list related to the spam telephone number.

The receiver 404 receives a call connection received from an external terminal. That is, the receiver 404 first receives all the calls received from the external terminal requesting the call connection to the Internet terminal included in the group.

The controller 400 notifies the representative Internet terminal number of the call connection of the external terminal received from the receiver, and requests to switch the call to the notified representative Internet terminal number. The control unit requests the external terminal that has requested the call transfer to input the extension number of the Internet terminal to which the actual call is to be connected. To this end, the control unit 400 may extract the extension number from the telephone number of the Internet terminal to which the first external terminal requests a call connection, and may request to temporarily store the extension number.

The control unit 400 checks whether the extension number of the Internet terminal to which the call is connected from the external terminal is input. The controller 400 requests a call transfer to the call forwarding unit 402 when the extension number of the Internet terminal to which the call is connected from the external terminal is input. The controller 400 stops or blocks the call connection if the extension number of the Internet terminal desired to connect to the call is not input from the external terminal.

The call forwarding unit 402 switches the call to the internet terminal requested by the external terminal according to the control command of the controller 400, so that the call between the external terminal and the internet terminal is performed. In the present invention, although the control unit 400 and the call forwarding unit 402 are shown in separate configurations, the operation may be performed in one configuration according to the setting.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present invention .

110: Internet terminal 1 112: Internet terminal 2
114: representative Internet terminal 120: VoIP gateway

Claims (10)

A method of processing a call connection request received from an external terminal in a VoIP gateway managing at least one Internet terminal including a representative Internet terminal in a VoIP environment using a SIP protocol,
Switching a call connection request to the representative Internet terminal by carrying a SIP 302 Moved Temporarily message and a representative telephone number to be transferred to a contact header of the message to the external terminal that has requested a call to the Internet terminal. Instructing;
When a call connection is requested from the external terminal to the representative internet terminal, requesting the external terminal to input an extension number of an internet terminal to which an actual call is to be connected;
If the requested extension number is input by the external terminal, connecting a call between the external terminal and the internet terminal.
The method of claim 1,
If the extension number is not input from the external terminal, rejects the call connection request requested by the external terminal.
The method of claim 1, wherein the step of instructing the representative Internet terminal to switch the call connection request comprises:
And notifying the external terminal of the account of the representative Internet terminal.
The method of claim 3, wherein the account is a telephone number of the representative Internet terminal.
An apparatus for processing a call connection request received from an external terminal in a VoIP gateway managing at least one internet terminal including a representative internet terminal,
Switching a call connection request to the representative Internet terminal by carrying a SIP 302 Moved Temporarily message and a representative telephone number to be transferred to a contact header of the message to the external terminal that has requested a call to the Internet terminal. A control unit for instructing the external terminal to input an extension number of an internet terminal to which an actual call is to be connected, when a call connection is requested from the external terminal to the representative internet terminal;
And when the requested extension number is input by the external terminal, a call forwarding unit for connecting a call between the external terminal and the internet terminal according to the instruction of the controller.
6. The call connection processing apparatus according to claim 5, further comprising a storage unit which stores a telephone number of at least one internet terminal including the representative internet terminal.
The apparatus of claim 6, further comprising a receiver configured to receive a call connection request from the external terminal.
The method of claim 6, wherein the control unit,
And if the extension number requested from the external terminal is not input, reject the call connection request.
At least one internet terminal including a representative internet terminal;
Instruct the external terminal requesting a call to the Internet terminal to switch the call connection request to the representative Internet terminal by carrying a SIP 302 Moved Temporarily message and a representative telephone number to be transferred in a contact header of the message. And, when a call connection is requested from the external terminal to the representative internet terminal, a VoIP gateway requesting the external terminal to input an extension number of an internet terminal to which an actual call is to be connected.
The method of claim 9, wherein the VoIP gateway,
When the requested extension number is input by the external terminal, a call between the external terminal and the internet terminal is connected according to the instruction of the controller,
And if the extension number requested from the external terminal is not input, rejects the call connection request.

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