METHOD AND SYSTEM OF PSAP CALL BACK OF IN SUBSCRIBER

• US 20090253400A1
• Filed: 04/07/2008
• Published: 10/08/2009
• Est. Priority Date: 04/07/2008
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Jayanna, Shivaraju
• Granted Patent: US 8,396,444 B2
• Time in Patent Office: Days
• US Class Current: 455/404.100
• CPC Class Codes: H04M 2242/04 for emergency applications
• CPC Class Codes: H04M 3/42195 Arrangements for calling back a calling subscriber when the wanted subscriber ceases to be busy H04M3/48
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13152 Callback
• CPC Class Codes: H04Q 2213/13251 Restricted service, class of service
• CPC Class Codes: H04Q 2213/13256 Call screening
• CPC Class Codes: H04Q 2213/1327 Release and resetting of connection
• CPC Class Codes: H04Q 2213/13272 Premature release
• CPC Class Codes: H04Q 2213/13345 Intelligent networks, SCP
• CPC Class Codes: H04Q 2213/1337 Operator, emergency services
• CPC Class Codes: H04Q 3/0029 Provisions for intelligent networking
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 76/50 for emergency connections

Abstract

A method and system for re-establishing a connection from a PSAP or 911 call center to a terminal of a 911 caller who has subscribed to IN services, for example, after a terminal of a 911 caller has been disconnected from the PSAP or 911 call center. If the call is dropped, the PSAP or 911 call center can, manually, or automatically via the system of the present invention, dial or cause to be dialed, a pre-determined prefix prior to dialing the number of the terminal of the 911 caller. In a separate embodiment of the method and system of the present invention, a separate parameter is used in CAMEL IDP and ISUP IAM to indicate the calling party category to identify that the call is originating from a PSAP or 911 call center.

Claims

1. A method of establishing a connection from a Public Safety Answering Point (PSAP) to a terminal subscribed to Intelligent Network (IN) services, comprising the steps of:

receiving by the PSAP, a call report with the number of the terminal; and

dialing, or causing to be dialed, a pre-determined prefix and then dialing the number of the terminal.

2. The method of claim 1, wherein the number of the terminal is a Mobile Station International Subscriber Directory Number (MSISDN).

3. The method of claim 1, further comprising the initial step of configuring service provider core switches with data translations necessary to receive and identify the prefix so as to permit the PSAP to cause a connection to be made to the terminal.

4. The method of claim 1, wherein a PSAP dispatcher manually enters the prefix.

5. The method of claim 1, wherein the dialing of the prefix authorizes the terminal to receive all incoming calls.

6. The method of claim 1, wherein the dialing of the prefix authorizes the terminal to receive all incoming calls for a fixed amount of time.

7. A method of establishing a connection from a Public Safety Answering Point (PSAP) to a terminal subscribed to Intelligent Network (IN) services, comprising the steps of:

receiving by the PSAP, a call report with the number of the terminal; and

using a separate parameter in Customized Applications for Mobile Network Enhanced Logic (CAMEL) Initial Detection Point (IDP) and ISDN User Part (ISUP) Initial Address Message (IAM) to indicate the calling party category to identify the call at the terminal as being from a PSAP.

8. The method of claim 7, wherein the number of the terminal is a Mobile Station International Subscriber Directory Number (MSISDN).

9. The method of claim 7, further comprising the initial step of configuring service provider core switches with data translations necessary to receive and identify the calling party category so as to permit the PSAP to cause a connection to be made to the number of the terminal.

10. The method of claim 7, wherein the separate parameter authorizes the terminal to receive all incoming calls.

11. The method of claim 7, wherein a terminal is authorized to receive all incoming calls form a subscriber with calling party category other than the normal calling party category so that calls from PSAP or 911 call centers are identified and permitted for free.

12. A method of establishing a connection from a Public Safety Answering Point (PSAP) to a terminal subscribed to Intelligent Network (IN) services, comprising the steps of:

receiving by the PSAP, a call report with the number of the terminal;

identifying, by an Mobile Switching Center (MSC) or an external node interfaced to the MSC, the terminal Mobile Station International Subscriber Directory Number (MSISDN); and

communicating the terminal MSISDN to the IN network to authorize the terminal to receive all incoming calls for a fixed amount of time.

13. A method of establishing a connection from a Public Safety Answering Point (PSAP) to a terminal subscribed to Intelligent Network (IN) services, comprising the steps of:

receiving by the PSAP, a call report with the number of the terminal, wherein the number is a Mobile Station International Subscriber Directory Number (MSISDN);

adding a prefix to the calling party MSISDN (collectively, “

digits”

) to connect the call to the terminal;

receiving the digits, via a Base Station (BS) and a Base Station Controller (BSC) in a Visiting Mobile Switching Center (V-MSC);

analyzing, by the V-MSC, the digits;

routing the call to a Gateway Mobile Switching Center (GMSC) being used by the terminal without stripping or altering the digits;

performing B-number and Signaling Connection and Control Part (SCCP) analysis at the GMSC, wherein the global title “

Routing Case”

provides the Signaling Point (SP) of the Home Location Register (HLR);

sending the Mobile Application Part (MAP) message “

Send Routing Information (SRI)”

to the HLR by the Message Transport Part (MTP);

receiving, at the GMSC, Terminating CAMEL Subscription Information (T-CSI) data from the HLR wherein the T-CSI data indicates that Customized Applications for Mobile Network Enhanced Logic (CAMEL) services are to be applied to mobile terminating calls and routing to the GSM Service Switching Function (gsmSSF) is invoked;

sending a Service Key (SK) from the HLR and data for CAMEL from the gsmSSF to a Service Control Point;

identifying the service to be invoked in the SCP;

sending, by the SCP, interrogations about parameters associated with the terminal to a Service Data Point (SDP) to determine if a call is allowed and, if so, for how long; and

addressing, in an IN platform, the A-number prefix in such a way that SCP always allows the connection of a call with the prefix dialed by the PSAP in the call from the PSAP to a terminal of the IN subscriber.

14. A method of establishing a connection from a Public Safety Answering Point (PSAP) to a terminal subscribed to Intelligent Network (IN) services, comprising the steps of:

receiving by the PSAP, a call report with the number of the terminal, wherein the number is a Mobile Station International Subscriber Directory Number (MSISDN);

assigning a separate calling party category to connect the call to the terminal (collectively, the calling party category and MSISDN are referred to as “

digits”

);

receiving the digits, via a Base Station (BS) and a Base Station Controller (BSC) in a Visiting Mobile Switching Center (V-MSC);

analyzing, by the V-MSC, the calling party category and MSISDN;

routing the call to the Gateway Mobile Switching Center (GMSC) used by the terminal without stripping or altering the calling party category or the MSISDN;

performing, at the GMSC, B-number and SCCP analysis, wherein the global title “

Routing Case”

provides the Signaling Point (SP) of the HLR;

sending, by the HLR, the MAP message “

Send Routing Information”

by Message Transport Part (MTP);

receiving, by the GMSC, T-CSI data from HLR, wherein the T-CSI data indicates that CAMEL services are to be applied to mobile terminating calls and routing to the gsmSSF is invoked;

sending a Service Key (SK) from HLR, and data for CAMEL, from gsmSSF to SCP to identify the service to be invoked in the SCP;

sending, by the SCP, interrogations about a subscriber to a Service Data Point (SDP), to check if a call is allowed and, if so, for how long; and

in an IN platform, addressing an A-number in such way that a Service Control Point (SCP) always allows the connection of a call with the PSAP calling party category in the call from the PSAP.

15. A method of establishing a connection from a Public Safety Answering Point terminal (PSAP) to a 911 caller terminal subscribed to Intelligent Network (IN) services, comprising the steps of:

receiving, by the PSAP, a call report with the number of the terminal, wherein the number is a Mobile Station International Subscriber Directory Number (MSISDN);

using, by the PSAP, a fixed, wireline terminal to dial a prefix and then the MSISDN number (collectively, “

digits”

) of the 911 caller terminal;

at a Local Exchange Carrier (LEC), using data translations to receive and analyze the digits;

routing the digits through an Inter Exchange carrier (IXC) as needed so that the digits reach a Gateway Mobile Switching Center (GMSC) used by the 911 caller terminal.

16. A method of establishing a connection from a Public Safety Answering Point terminal (PSAP) to a 911 caller terminal subscribed to Intelligent Network (IN) services, comprising the steps of:

receiving by the PSAP, a call report with the number of the terminal, wherein the number is a Mobile Station International Subscriber Directory Number (MSISDN);

using, by the PSAP, a fixed, wireline terminal to dial a separate calling party category and then the MSISDN number (collectively, “

digits”

) of the 911 caller terminal;

at a Local Exchange Carrier (LEC), using data translations to receive and analyze the digits;

routing the digits through an Inter Exchange carrier (IXC) as needed so that the digits reach a Gateway Mobile Switching Center (GMSC) used by the 911 caller terminal.

17. A system of establishing a connection from a Public Safety Answering Point (PSAP) to a terminal subscribed to Intelligent Network (IN) services, comprising:

means for receiving by the PSAP, a call report with the number of the terminal;

means for adding a prefix to the calling party MSISDN (collectively, “

digits”

) to connect the call to the terminal;

means for receiving the digits, via a Base Station (BS) and a Base Station Controller (BSC) in a Visiting Mobile Switching Center (V-MSC);

means for analyzing, by the V-MSC, the digits;

means for routing the call to a Gateway Mobile Switching Center (GMSC) being used by the terminal without stripping or altering the digits;

means for performing B-number and Signaling Connection and Control Part (SCCP) analysis at the GMSC, wherein the global title “

Routing Case”

provides the Signaling Point (SP) of the Home Location Register (HLR);

means for sending the Mobile Application Part (MAP) message “

Send Routing Information (SRI)”

to the HLR by the Message Transport Part (MTP);

means for receiving, at the GMSC, Terminating CAMEL Subscription Information (T-CSI) data from the HLR wherein the T-CSI data indicates that Customized Applications for Mobile Network Enhanced Logic (CAMEL) services are to be applied to mobile terminating calls and routing to the GSM Service Switching Function (gsmSSF) is invoked;

means for sending a Service Key (SK) from the HLR data for CAMEL from the gsmSSF to a Service Control Point;

means for identifying the service to be invoked in the SCP;

means for sending, by the SCP, interrogations about parameters associated with the terminal to a Service Data Point (SDP) to determine if a call is allowed and, if so, for how long; and

means for addressing, in an IN platform, the A-number prefix in such a way that SCP always allows the connection of a call with the prefix dialed by the PSAP in the call from the PSAP to a terminal of the IN subscriber.

18. A system for establishing a connection from a Public Safety Answering Point (PSAP) to a terminal subscribed to Intelligent Network (IN) services, comprising:

means for receiving by the PSAP, a call report with the number of the terminal, wherein the number is a Mobile Station International Subscriber Directory Number (MSISDN);

means for assigning a separate calling party category to connect the call to the terminal (collectively, the calling party category and MSISDN are referred to as “

digits”

);

means for receiving the digits, via a Base Station (BS) and a Base Station Controller (BSC) in a Visiting Mobile Switching Center (V-MSC);

means for analyzing, by the V-MSC, the calling party category and MSISDN;

means for routing the call to the Gateway Mobile Switching Center (GMSC) used by the terminal without stripping or altering the calling party category or the MSISDN;

means for performing, at the GMSC, B-number and SCCP analysis, wherein the global title “

Routing Case”

provides the Signaling Point (SP) of the HLR;

means for sending, by the HLR, the MAP message “

Send Routing Information”

by Message Transport Part (MTP);

means for receiving, by the GMSC, T-CSI data from HLR, wherein the T-CSI data indicates that CAMEL services are to be applied to mobile terminating calls and routing to the gsmSSF is invoked;

means for sending a Service Key (SK) from HLR, and data for CAMEL, from gsmSSF to SCP to identify the service to be invoked in the SCP;

means for sending, by the SCP, interrogations about a subscriber to a Service Data Point (SDP), to check if a call is allowed and, if so, for how long; and

means for, in an IN platform, addressing an A-number prefix in such way that a Service Control Point (SCP) always allows the connection of a call with the PSAP calling party category in the call from the PSAP.

19. A system of establishing a connection from a Public Safety Answering Point terminal (PSAP) to a 911 caller terminal subscribed to Intelligent Network (IN) services, comprising:

means for receiving, by the PSAP, a call report with the number of the terminal, wherein the number is a Mobile Station International Subscriber Directory Number (MSISDN);

means for using, by the PSAP, a fixed, wireline terminal to dial a prefix and then the MSISDN number (collectively, “

digits”

) of the 911 caller terminal;

means for, at a Local Exchange Carrier (LEC), using data translations to receive and analyze the digits; and

means for routing the digits through an Inter Exchange carrier (IXC) as needed so that the digits reach a Gateway Mobile Switching Center (GMSC) used by the 911 caller terminal.

20. A system for establishing a connection from a Public Safety Answering Point terminal (PSAP) to a 911 caller terminal subscribed to Intelligent Network (IN) services, comprising:

means for receiving by the PSAP, a call report with the number of the terminal, wherein the number is a Mobile Station International Subscriber Directory Number (MSISDN);

means for using, by the PSAP, a fixed, wireline terminal to dial a separate calling party category and then the MSISDN number (collectively, “

digits”

) of the 911 caller terminal;

means for, at a Local Exchange Carrier (LEC), using data translations to receive and analyze the digits; and

means for routing the digits through an Inter Exchange carrier (IXC) as needed so that the digits reach a Gateway Mobile Switching Center (GMSC) used by the 911 caller terminal.