Oracle International Corporation

Vimal Chandra Tewari

Lalit Grover

Jayesh Shrimali

A method for handling IMS registrations at a P-CSCF after PCRF database failure includes receiving a SIP REGISTER request message after a PCRF database failure and determining that the SIP REGISTER request message is for an existing user. The method further includes obtaining a list of user contacts having entries in a registration cache of the P-CSCF corresponding to an address of record in the SIP REGISTER request message, testing reachability of the user contacts in the list, and freeing resources of the P-CSCF for the user contacts determined to be unreachable.

Methods, systems, and computer readable media for handling internet protocol (IP) multimedia subsystem (IMS) registration at proxy call session control function (P-CSCF) for roaming users after policy and charging rules function (PCRF) database failure

Methods, systems, and computer readable media for restoration of Diameter connectivity. An example method includes accepting a first Diameter connection with a Diameter client having a Diameter identifier. The method includes receiving a request to establish a new Diameter connection with the Diameter identifier. The method includes holding the request to establish a new Diameter connection for a specified time limit, and, while holding the request, probing the first Diameter connection to determine whether the first Diameter connection has been broken. In response to determining that the first Diameter connection has been broken, the method includes aborting the first Diameter connection and accepting a second Diameter connection with the Diameter client having the Diameter identifier.

Methods, systems, and computer readable media for restoration of diameter connectivity

Methods, systems, and computer readable media for routing of packets for lawful interception (LI). A system includes at least one session border controller (SBC) configured for forwarding media streams to a forwarding function. The system includes the forwarding function, implemented on a centralized node for a telecommunications network. The forwarding function is configured for receiving the media streams and forwarding each media stream to a respective lawful intercept mediation server for at least one country associated with the media stream. The forwarding function is configured for, in response to receiving a first packet of a first media stream from the SBC, performing a destination lookup for the first media stream and sending a mediation server identifier for the first media stream to the SBC. The SBC can be configured for sending a session release indicator and a direction flag to the forwarding function.

Methods, systems, and computer readable media for routing of packets for lawful interception

A first SBC establishes a first media session between a transferor and a transferee. A second SBC establishes a second media session between the transferor and a transfer target. The first SBC receives a REFER message initiated by the transferor and determines that a dialog ID in the REFER message does not correspond to a media session currently being handled by the first SBC. The first SBC sends a SIP INVITE message to a plurality of SBCs, including the second SBC, that are in a load sharing group with the first SBC. The SIP INVITE message includes the dialog ID associated with the second media session, which triggers the second SBC to re-use the second media session to establish a media session between the transferee and the transfer target.

Methods, systems, and computer readable media for optimized inter-session border controller (SBC) attended call transfer with re-use of transfer target session

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Bengaluru, India

Vimal Chandra Tewari