Systems and Methods for Providing Emergency Callback Procedures
First Claim
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1. A method for operating a gateway mobile switching center (GMSC) to execute an emergency callback to a mobile device, the method comprising:
- processing, at a GMSC, an emergency callback received from a public safety answering point (PSAP) in response to an unexpected release of an emergency call to reestablish communication between the PSAP and the mobile device;
the GMSC issuing a special-use SendRoutingInformation (SRI) message to a home location register (HLR), the special-use SRI message comprising a parameter to suppress a call blocking feature enabled for a calling party of the emergency call;
the GMSC processing an SRI response message received from the HLR in response to the special-use SRI message, the SRI response message comprising a Mobile Station Roaming Number (MSRN); and
the GMSC routing the emergency callback to a servicing mobile switching center (MSC) based upon the MSRN.
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Abstract
Enhanced services, such as call restriction, call forwarding, anonymous call rejection, and proprietary services, may interfere with an emergency callback potentially preventing the callback from reaching the intended destination. Systems and methods for processing emergency calls to eliminate emergency callback failure in response to an emergency call being released are provided herein.
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Citations
17 Claims
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1. A method for operating a gateway mobile switching center (GMSC) to execute an emergency callback to a mobile device, the method comprising:
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processing, at a GMSC, an emergency callback received from a public safety answering point (PSAP) in response to an unexpected release of an emergency call to reestablish communication between the PSAP and the mobile device; the GMSC issuing a special-use SendRoutingInformation (SRI) message to a home location register (HLR), the special-use SRI message comprising a parameter to suppress a call blocking feature enabled for a calling party of the emergency call; the GMSC processing an SRI response message received from the HLR in response to the special-use SRI message, the SRI response message comprising a Mobile Station Roaming Number (MSRN); and the GMSC routing the emergency callback to a servicing mobile switching center (MSC) based upon the MSRN. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A gateway mobile switching center (GMSC) for delivering an emergency callback, comprising:
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a processor associated with a GMSC; and a memory, in communication with the processor, the memory being configured to store instructions that, when executed, perform the steps of; processing an emergency callback received from a public safety answering point (PSAP) in response to an unexpected release of an emergency call; issuing a special-use SendRoutingInformation (SRI) message to a home location register (HLR), the SRI message comprising a parameter to suppress a call blocking feature enabled for an emergency calling party; processing an SRI response message received from the HLR in response to the SRI message, the SRI response message comprising a Mobile Station Roaming Number (MSRN); and routing the emergency callback to a serving mobile switching center (MSC) based upon the MSRN. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for operating an emergency callback platform, the method comprising:
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processing, at an emergency callback platform, a request received from a gateway mobile switching center (GMSC), the request being for a Mobile Subscriber ISDN Number (MSISDN) that matches a temporary routing number included in the request; determining, at the emergency callback platform, the MSISDN that matches the temporary routing number; and issuing, at the emergency callback platform, a response to the GMSC, the response comprising the MSISDN and a calling party category (CPC) value. - View Dependent Claims (14)
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15. A method for operating a location register to deliver an emergency callback, the method comprising:
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processing, at a location register, a special-use SendRoutingInformation (SRI) message received from a gateway mobile switching center (GMSC), the SRI message comprising a parameter to suppress a call blocking feature enabled for an emergency calling party; the location register suppressing the call blocking feature in accordance with the parameter such that the call blocking feature does not interfere with, an emergency callback procedure to a mobile device associated with the emergency calling party; the location register communicating with a serving mobile switching center (MSC) to retrieve a mobile station roaming number (MSRN); and the location register issuing an SRI response message to the GMSC, the SRI response message comprising the MSRN. - View Dependent Claims (16)
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17. A method for handling an emergency callback in an Internet Protocol (IP) multimedia subsystem (IMS) network, the method comprising:
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in response to an unexpected release of an emergency call, an IMS network receiving an emergency callback at a callback gateway, the emergency callback comprising a called party number (CdPN) field populated with a temporary callback number (TCBNUM) and a calling party number (CgPN) field populated with a number for a public safety answering point (PSAP) handling the emergency call;
wherein the TCBNUM is received by the PSAP in response to the PSAP sending an emergency services positioning request (ESPOREQ) to a gateway mobile location center (GMLC) and, wherein the TCBNUM is matched to a mobile subscriber ISDN number (MSISDN) of an emergency calling party and the match is maintained by the GMLC;generating, at the IMS network, a special session initiation protocol (SIP) invite and directing the special SIP invite to an emergency callback application sender (ECB-AS);
wherein the ECB-AS previously received a first data update from the GMLC, the first data update comprising the TCBNUM and the corresponding MSISDN for the emergency calling party and, wherein the ECB-AS previously received a second data update from the GMLC, the second data update comprising a call termination notice to inform the ECB-AS the emergency call has been terminated;generating, at the ECB-AS, a special-use SendRoutingInformation (SRI) message that is directed to a location register, the special-use SRI message comprising a parameter to suppress a call blocking feature enabled for the emergency calling party; generating, at the ECB-AS, an invite message directed to the IMS network, the invite message comprising a mobile station routing number (MSRN) in a to field of the invite message and the PSAP number tagged as emergency in a from field of the invite message;
wherein the MSRN is received by the ECB-AS in an SRI ACK message sent from the location register and, wherein the MSRN is obtained by the location register during a ProvideRoutingNumber (PRN) process executed between the location register and a serving mobile switching center (MSC); andthe IMS network sending a modified emergency callback to the serving MSC to connect the emergency call, the modified emergency callback comprising the MSRN, the CgPN and any CPC data.
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Specification