CN101656946A - Gateway for international roaming call and routing method thereof - Google Patents

Abstract

The invention relates to a gateway of international roaming call and a routing method thereof. The gateway of public switched telecommunication network of the invention comprises a storage medium for recording a number comparison table and a call record table. The number comparison table is a comparison table for recording the mobile phone number of a roaming user and the number of a fixed-line telephone network of a calling place. The calling record table records a calling number and the mobile phone number of the roaming user.

Description

Gateway for International Roaming Call and Its Routing Method

technical field

The invention relates to a telecommunication network service, in particular to a gateway for an optimized international roaming service node and a routing method thereof.

Background technique

Due to the development of mobile communication technology, the location of making and receiving calls is no longer limited by the laying range of the wired network. In recent years, telecom service providers have even provided international roaming services, enabling users to receive and make mobile calls conveniently no matter where they are located at home or abroad. However, most international roaming calls go through two international trunks, which makes the call cost high.

Although there are many low-rate plans on the market, they either require users to dial multiple numbers, or require users to purchase additional devices, such as SIM cards or external boxes, which reduce the convenience of use. These mechanisms can only achieve the function of saving the dialing fee. Others modify the structure of the existing mobile communication system to achieve the effect of cost saving, but the cost of rearranging the communication nodes still makes the service cost unable to be effectively controlled. To sum up, the international telephone fee saving scheme that takes into account the convenience of use and the deployment cost is actually a very important topic at present.

Contents of the invention

An embodiment of the international roaming call gateway of the present invention includes a storage medium and a toll-routing module. The storage medium is used to record a number comparison table and a call record table, wherein the number comparison table is a comparison table for recording a roaming user's mobile phone number and a fixed network number of a place of origin, and the call record table is a record A calling number and the mobile phone number of the roaming user. The toll-save bypass module establishes a connection according to the record of the storage medium.

An embodiment of the international roaming call bypassing method of the present invention includes the following steps: record a mobile phone number of a roaming user and a fixed network number of a place of sending a call with a number comparison table; mobile phone number of the roaming user.

Another embodiment of the international roaming call routing method of the present invention includes the following steps: the mobile phone records a current location; when the mobile phone receives a call from a caller, checks whether it is operating in a roaming mode, if then sending a rejection signal to reject the connection; and the mobile phone dials back to a PSTN gateway in a roaming location to establish a connection with the caller.

Description of drawings

Figure 1 shows an embodiment of the public switched telecommunications network gateway architecture of the present invention;

Figures 2 to 4 show an embodiment of applying the public switched telecommunications network gateway of the present invention to achieve international roaming fee saving;

FIG. 5 shows a flowchart of a fee-saving bypass mechanism according to an embodiment of the present invention; and

FIG. 6 shows another embodiment of applying the PSTN gateway of the present invention to save international roaming charges.

Reference number

10 PSTN Gateway 102 Storage Media

104 section fee bypass module 112 number comparison table

114 Call Record Table 116 Callback Timer

30a PSTN Gateway 302a Storage Media

304a section fee bypass module 312a number comparison table

314a Call record table 30b PSTN gateway

302b Storage media 304b Fee-saving routing module

314b Speak Record Form

30c PSTN Gateway 302c Storage Media

304c Fee Bypass Module 312c Number Comparison Table

314c Speak Record Table 302 Sender Terminal

304 switch 306 IP network

308 Home ISC 309 Receiver ISC

310 GMSC 312 HLR

316 VLR 318 Receiver MSC

320 roaming users 602 wireless network base stations

Detailed ways

FIG. 1 shows an embodiment of a PSTN gateway architecture 10 of the present invention, which includes a storage medium 102 and a toll-bypass module 104 . The storage medium 102 is used to record a number comparison table 112 and a call recording table 114, wherein the number comparison table 112 records a roaming user's mobile phone number and a fixed network number comparison table corresponding to the roaming user's calling place, The call record table 114 records a call number and the mobile phone number of the roaming user. When the caller wants to talk with the roaming user, he will dial the fixed network number of the roaming user.

When the public switched telecommunications network gateway 10 is operating in the originating mode, when receiving a call from the caller, the toll-saving bypass module 104 will check the call record table 114, and communicate with the public exchange at the home location of the roaming user through an Internet The telecommunications network gateway establishes the connection between the calling end and the roaming user.

When the public switched telecommunication network gateway 10 operates the home location mode, after receiving the connection request of the public switched telecommunication network gateway or the caller's connection (incoming call) request, the fee-saving bypass module 104 checks the call record table 114. After setting up the connection between the calling end and the receiver (roaming user), or accepting a connection rejection signal from the roaming user, start a callback timer 116, and have not received any callback after the callback timer 116 expires Dialing the connection, then the fee-saving bypass module 104 clears the call record table 114, and can reject the connection between the calling end and the roaming user; or accept a callback signal before the callback timer 116 expires, and the section The toll-routing module 104 checks the call record table 114, and transfers the callback signal to the PSTN gateway of the originating place.

When the public switched telecommunications network gateway 10 is operating in the receiver mode, when both the caller and the receiver (roaming user) are in the home location, the fee-saving bypass module 104 checks the call record table 114, and directly establishes the caller and caller. The connection of the roaming user; or when the roaming user refuses the connection of the public switched telecommunications network gateway of the home location, the public switched telecommunications network gateway of the receiving place can accept the call-back signal of the roaming user, and the fee-saving bypass module 104 will Check the conversation record table 114, when there is a record in the conversation record table 114, set up the connection between the calling end and the roaming user; otherwise, when there is no record in the speech record table 114, then the callback signal will return to the property The location of the public switched telecommunications network gateway.

If the PSTN gateway 10 operating in the home location mode first receives the callback request signal and then receives the rejection signal from the roaming client, the PSTN gateway 10 ignores the rejection message.

In an embodiment of the present invention, the PSTN gateway 10 is connectable to a PSTN. For example, the public switched telecommunications network gateway 10 can be connected to network nodes such as a mobile switching center (Mobile Switching Center, MSC), a gateway mobile switching center (Gateway Mobile Switching Center, GMSC), and a switch (Switch). In addition, the PSTN gateway 10 can also be connected to a telecom-grade IP network.

In some embodiments of the present invention, the public switched telecommunications network gateway can follow the design of a session initiation protocol (Session Initiation Protocol, SIP) and real-time transport protocol (Real-time Transport Protocol, RTP) server, so that the manufacturing cost is reduced.

Telecom operators that provide roaming services, in addition to deploying a public switched telecommunications network in various places (location of originating end, home location, and location of roaming users), also provide roaming users with multi-country fixed-line numbers, whose country can be seen that roaming users often visit depends on the country. In the following embodiments, a user requests a roaming service from a Taiwanese telecommunications operator. Because the user often visits the United States and Japan, the operator assigns a mobile phone number +886-931111111, a US fixed line number +1-4433333333 and a Japanese fixed line number +81-556666666 to the user.

FIG. 2 shows a first embodiment of applying the PSTN gateway of the present invention to achieve international roaming fee saving. In this example, the caller 302 located in the United States dials the roaming user 320 at the phone number +1-4432222222, and the roaming user 320 is located in Taiwan. First, the caller 302 dials the US fixed line number +1-4433333333 of the roaming user 320 . The call request will be transmitted to the US PSTN gateway 30a at the caller's location through the switch 304 at the caller's end, and the call will be charged as a local call. The fee-saving bypass module 304a in the US PSTN gateway 30a will find the mobile phone number (+886-931111111) of the roaming user according to the number comparison table 312a of its storage medium 302a, and according to the country code of the mobile door number, transparently The IP network 306 notifies the Taiwan PSTN gateway 30b of the home location. Therefore, this part of the call is through the Internet, not the charging method of international calls, so the cost of calling can be reduced. The fee-saving bypass module 304b of the Taiwan public switched telecommunications network gateway 30b at the home location is connected to the mobile phone of the roaming user 320 via the GMSC 310, and this section of the call adopts a local telephone charging method.

FIG. 3 shows a second embodiment of applying the PSTN gateway of the present invention to save international roaming charges. In this example, a caller 302 located in the United States dials a roamer 320 who is also located in the United States at the phone number +1-4432222222. First, the same procedure, the caller 302 dials the roaming user's US fixed line number +1-4433333333, and the fee-saving routing module 304a in the US PSTN gateway 30a will find the roaming number according to the number comparison table 312a of the storage medium 302a. The mobile phone number of the user, and according to the country code of the mobile phone number, notify the public switched telecommunications network gateway 30b of the home location through the IP network 306 . The public switched telecommunications network gateways 30a, 30b at the calling location and the home location will respectively create a calling record table 314a, 314b to record the calling number and the mobile phone number of the roaming user. Because the roaming subscriber 320 is also located in the U.S., the Taiwan public switched telecommunications network gateway 30b at the home location will pass through the home location International Gateway Exchange (International Switching Center, ISC) 308, the destination (U.S.) ISC 309, The mobile phone of the roaming subscriber 320 located in the United States is connected to the MSC 318 of the receiving place. The mobile phone of the roaming user 320 will reject the incoming call from the Taiwan PSTN gateway 30b after receiving the notification of the incoming call, and dial back to the roaming US PSTN gateway 30a to establish a connection. The toll-saving bypass module 304a of the US PSTN gateway 30a learns that the caller 302 intends to connect with the roaming user 320 through querying the call record 314a, so a connection between the two is established. After the Taiwan PSTN gateway 30b receives the rejected call from the mobile phone of the roaming user 320, it will start a callback timer. When the callback timer expires, the toll-saving bypass module 304b will clear the call record table 314b.

Similar to the situation in FIG. 2 , this embodiment only costs two sections of regional calls and one section of network calls. It should be added that the mobile phone of the roaming user 320 can have a built-in program to have functions such as rejecting incoming calls and automatically calling back.

FIG. 4 shows a third embodiment of applying the PSTN gateway of the present invention to save international roaming charges. In this example, the caller 302 located in the United States dials the roaming user 320 at the phone number +1-4432222222, and the roaming user 320 is located in Japan. First, the same procedure, the caller 302 dials the roaming user's US fixed line number +1-4433333333 and notifies the PSTN gateway 30b of the home location (Taiwan) through the IP network 306 . The public switched telecommunications network gateways 30a and 30b at the calling location and the home location will respectively create a calling record record table 314a and 314b to record the calling number and the mobile phone number of the roaming user. The Taiwan public switched telecommunications network gateway 30b of the home position saves the fee and bypasses the module 304b via the standard mobile phone establishment program of the GMSC 310, through the GMSC310, the home location register (Home Location Register, HLR) 312, the home location ISC 308, the received call The path of the international gateway switch 309 and the visitor location register (Visitor Location Register, VLR) 316 obtains the mobile phone roaming number (Mobile Station Roaming Number, MSRN) to establish a connection. After the mobile device of the roaming user 320 receives the connection establishment request, the mobile device of the roaming user 320 rejects the call from the Taiwan PSTN gateway 30b and dials back to the local Japanese PSTN gateway 30c. When the Taiwan PSTN gateway 30b at the home location receives the rejected call from the mobile device of the roaming user 320, a callback timer is started. If the roaming user 320 does not call back within a preset time, the call is canceled.

After receiving the call back from the roaming user 320, the Japanese public switched telecommunications network gateway 30c at the location of the roaming user checks whether there is a call record related to the roaming user in its call record table 314c. If yes, it means that the caller is also located in the country where the recipient is located. On the contrary, in this embodiment, the caller 302 is located in the U.S., therefore, the Japanese public switched telecommunications network gateway 30c knows that the home location of the roaming user is Taiwan according to the door number (+886-931111111) of the roaming user 320, and will transmit the information via IP The network 306 sends the callback request message to the Taiwan PSTN gateway 30b at the home location. If the above-mentioned callback request information is received before the callback timer expires, the toll-saving bypass module queries the call record table 314b according to the number of the calling end, and calls back to the original calling end in the United States. If the above-mentioned callback request message is received after the callback timer expires, the fee-saving bypass module 304b clears the call record table 314b, and rejects the connection between the caller 302 and the roaming user 320 .

After receiving the callback request information from the roaming place, the Taiwan PSTN gateway 30b at the home location can retrieve the number and country of the original caller 302 according to the roaming user's door number, and then make the call through the IP network 306 It is routed to the US public switched telecommunications network gateway 30a. The toll-saving bypass module 304a of the US PSTN gateway 30a learns that the caller 302 intends to connect with the roaming user 320 by querying the call record 314a. When the US PSTN gateway 30a connects the callback call, two sections of international trunks are simplified to two sections of regional calls and one section of VoIP calls, which can greatly reduce the cost of international calls.

FIG. 5 shows a flow chart of the fee-saving bypass mechanism according to an embodiment of the present invention. In step S501, the mobile device of the roaming user first records the current location. In step S502, when the mobile device of the roaming user receives an incoming call from a caller, it first checks whether the mobile phone is in roaming mode. If operating in the roaming mode, send a rejection message to the PSTN gateway at the home location to reject the connection, as in step S504. Next, dial back to the PSTN gateway of the roaming location and call back to the calling end via the PSTN gateway of the home location to request to establish a connection. This bypasses the method and makes the mobile phone ring, as in step S505.

In some embodiments of the present invention, the acquisition of the current roaming location of the mobile device in step S501 can be obtained by using an AT command set AT+COPS command to obtain the current roaming location (for example, countrycode). In other embodiments of the present invention, the retrieval of the current roaming location can be obtained by the lineGetCurrentOperator function of the Windows Mobile/CEExtended TAPI application program. In step S503, if the caller is not in roaming mode (that is, the caller is not at the home location), the standard mobile phone setup procedure is started.

The mobile phone of the present invention has a mechanism of disconnecting and dialing back to the gateway of the public switched telecommunications network when international roaming calls are received. In addition, in order to further pursue the goal of saving calling costs, a dual-network mobile phone with wireless network function can be used, as shown in Figure 6. Please refer to Figure 2 at the same time. When receiving an international roaming call, the roaming user 320 can connect to the wireless network base station 602 and reply in the wireless network call mode. This section of the regional call can save dialing charges because it is dialed through the wireless network .

The present invention does not change the usage habits of users, and still maintains the convenience of international roaming. Most of the existing products on the market can only be used for calling, but the present invention can achieve the cost-saving effect no matter whether it is sending or receiving calls. In terms of deployment cost, compared with existing products on the market, the present invention has low cost and is compatible with existing equipment, so it can be immediately adopted by the industry.

The technical content and technical features of the present invention are disclosed above, but those skilled in the art may still make various substitutions and modifications based on the teaching and disclosure of the present invention without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should not be limited to those disclosed in the embodiments, but should include various replacements and modifications that do not depart from the present invention, and are covered by the scope of the following claims.

Claims (28)

1. the gateway of an international roaming conversation is characterized in that, the gateway of described international roaming conversation comprises:

One Storage Media, in order to write down a digitmap and a record sheet of giving orders or instructions, wherein said digitmap is the give orders or instructions table of comparisons of ground fixed network number of record one roamer's Mobile Directory Number and, and the described record sheet of giving orders or instructions is record one calling number and described roamer's a Mobile Directory Number; And

One joint expense is set up line around sending module according to the record of described Storage Media.

2. the gateway of international roaming conversation according to claim 1, it is characterized in that, when described gateway operation when one gives orders or instructions ground mode, described joint expense is around sending module can check the described record sheet of giving orders or instructions, and the public's switched message network gateway that sees through a world-wide web and described roamer's homing position is set up a first speaker and described roamer's line.

3. the gateway of international roaming conversation according to claim 1, it is characterized in that, when described gateway operation during in a destination pattern, as first speaker and listener during all at homing position, described joint expense is around sending module check the described record sheet of giving orders or instructions, directly to set up a first speaker and described roamer's line.

4. the gateway of international roaming conversation according to claim 1, it is characterized in that, when described gateway operation during in a destination pattern, when described roamer refuses the line of public's switched message network gateway of homing position, described joint expense is around sending module can check the described record sheet of giving orders or instructions, when if the described record sheet of giving orders or instructions has record, described joint expense is around sending module to set up a first speaker and described roamer's line.

5. the gateway of international roaming conversation according to claim 1, it is characterized in that, when described gateway operation during in a destination pattern, when described roamer refuses the line of public's switched message network gateway of homing position, described joint expense is around sending module can check the described record sheet of giving orders or instructions, when if the described record sheet of giving orders or instructions does not write down, described joint expense is around sending module to transmit the public switched message network gateway of a clawback solicited message to described roamer's homing position.

6. the gateway of international roaming conversation according to claim 1, it is characterized in that, when described gateway operation during in a homing position pattern, after the line request of the line request of the ground public's switched message network gateway of accepting to give orders or instructions or first speaker, described joint expense is set up a first speaker and described roamer's line around sending module check the described record sheet of giving orders or instructions.

7. the gateway of international roaming conversation according to claim 1 is characterized in that, when described gateway operation during in a homing position pattern, described joint expense then starts a clawback timer around sending module after receiving the refusal signal that described roamer sends; If described clawback solicited message received described clawback timer expires before, then described joint expense is around sending module to inquire about the described list of giving orders or instructions according to described calling number, and clawback to a first speaker.

8. the gateway of international roaming conversation according to claim 1 is characterized in that, when described gateway operation during in a homing position pattern, described joint expense then starts a clawback timer around sending module after receiving the refusal signal that described roamer sends; If described clawback solicited message do not receive described clawback timer expires before, then described joint expense is around sending the module removing the described list of giving orders or instructions, and refuses a first speaker and described roamer's line.

9. as the gateway of international roaming conversation as described in the claim 7, it is characterized in that described roamer sends the information of refusal incoming call after receiving the roaming incoming call.

10. as the gateway of international roaming conversation as described in the claim 9, it is characterized in that described clawback solicited message is to occur in after the information that described roamer sends the refusal incoming call.

11. the gateway of international roaming conversation is characterized in that described gateway is to link with public's switched message network according to claim 1.

12. the gateway of international roaming conversation is characterized in that described gateway is to be a call starting protocol and RTP server according to claim 1.

13. the gateway of international roaming conversation is characterized in that according to claim 1, described gateway is that the world-wide web with a telecommunications grade links.

14. international roaming conversation around delivery method, it is characterized in that the comprising the following steps: of described international roaming conversation around delivery method

The Mobile Directory Number and one that writes down a roamer with the digitmap ground fixed network number of giving orders or instructions; And

Write down a calling number and described roamer's Mobile Directory Number with the record sheet of giving orders or instructions.

15. as international roaming conversation as described in the claim 14 around delivery method, it is characterized in that, when operating in one when giving orders or instructions ground mode, further the comprising the following steps: of described international roaming conversation around delivery method

Check the described record sheet of giving orders or instructions; And

The public's switched message network gateway that sees through a world-wide web and described roamer's homing position is set up a first speaker and described roamer's line.

16. as international roaming conversation as described in the claim 14 around delivery method, it is characterized in that, when operating in a destination pattern and first speaker and listener all at homing position, further comprising around delivery method of described international roaming conversation checks that the described record sheet of giving orders or instructions is directly to set up the step of a first speaker and described roamer's line.

17. as international roaming conversation as described in the claim 14 around delivery method, it is characterized in that, when operating in a destination pattern and described roamer and refuse the line of public's switched message network gateway of homing position, further the comprising the following steps: of described international roaming conversation around delivery method

Check the described record sheet of giving orders or instructions;

When if the described record sheet of giving orders or instructions has record, set up the step of a first speaker and described roamer's line.

18. as international roaming conversation as described in the claim 14 around delivery method, it is characterized in that, when operating in a destination pattern and described roamer and refuse the line of public's switched message network gateway of homing position, further the comprising the following steps: of described international roaming conversation around delivery method

Check the described record sheet of giving orders or instructions; And

When if the described record sheet of giving orders or instructions does not write down, transmit the public switched message network gateway of a clawback solicited message to described roamer's homing position.

19. as international roaming conversation as described in the claim 14 around delivery method, it is characterized in that, when operating in a homing position pattern and acceptance and give orders or instructions the line request of the line request of ground public switched message network gateway or first speaker, further the comprising the following steps: of described international roaming conversation around delivery method

Check the described record sheet of giving orders or instructions; And

Set up the step of a first speaker and described roamer's line.

20. as international roaming conversation as described in the claim 14 around delivery method, it is characterized in that, when operating in a homing position pattern and receive the refusal signal that described roamer sends, further the comprising the following steps: of described international roaming conversation around delivery method

Start a clawback timer; And

If described clawback solicited message was received before described clawback timer expires, then according to described list and clawback to a first speaker of giving orders or instructions of described calling number inquiry.

21. as international roaming conversation as described in the claim 14 around delivery method, it is characterized in that, when operating in a homing position pattern and receive the refusal signal that described roamer sends, further the comprising the following steps: of described international roaming conversation around delivery method

Start a clawback timer; And

If described clawback solicited message was not received before described clawback timer expires, then remove the described list of giving orders or instructions, and refuse a first speaker and described roamer's line.

22. as international roaming conversation as described in the claim 21 around delivery method, it is characterized in that, what described international roaming was conversed further comprises the step of sending the information of refusal incoming call after described roamer is receiving the roaming incoming call around delivery method, and described clawback solicited message is to occur in described roamer to send after the information of refusing incoming call.

23. international roaming conversation around delivery method, it is characterized in that set in order to the roaming of controlling a mobile phone, described international roaming conversation comprises the following steps: around delivery method

Described mobile phone record one present place;

When described mobile phone is received the incoming call of a first speaker, check whether operate under the roam mode, connect with refusal if then transmit a refusal signal; And

Public's switched message network gateway of described mobile phone clawback to a roaming place is with the line of foundation with described first speaker.

24. as international roaming conversation as described in the claim 23 around delivery method, it is characterized in that, described mobile phone clawback to public's switched message network gateway step of described roaming place, more can via a homing position public's switched message network gateway to set up the line with described first speaker.

25. as international roaming conversation as described in the claim 23 around delivery method, it is characterized in that described international roaming conversation further is included in described present place when receiving the incoming call of described first speaker around delivery method, checks whether operate under the described roam mode; If not, then start a standard mobile phone creation facilities program (CFP).

26. as international roaming conversation as described in the claim 23 around delivery method, it is characterized in that the step that writes down described present place comprises that further instruction with an AT command set is to obtain described present place.

27. as international roaming conversation as described in the claim 26 around delivery method, it is characterized in that the step that writes down described present place comprises that further function with Windows Mobile/CE Extended TAPI application program is to obtain described present place.

28. as international roaming conversation as described in the claim 23 around delivery method, it is characterized in that described mobile phone has the connecting wireless network function, when the environment when being talked about can connect wireless network, then reply with the call mode of wireless network.

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