# US 10,873,844 B2 · Apparatus and methods for transmission of emergency call data over wireless networks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,844 B2 - Document ID: US10873844B2 - Status: Granted - Kind: B2 - Application number: 15/890,795 - Filed: 2018-02-07 - Published: 2018-06-14 - Granted: 2020-12-22 - Earliest claimed: 2009-02-10 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Martin Hans - Web page: https://patentgrep.com/patent/US10873844B2 ## CPC - H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS] - H04L 65/1069: Session establishment or de-establishment - H04L 65/401: wherein the services involve a main real-time session and one or more additional parallel real-time or time sensitive sessions, e.g. white board sharing or spawning of a subconference - H04L 65/65: Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP] - H04L 65/762: {at the source (reformatting of additional data in video distribution servers H04N21/2355)} - H04M 3/5116: {for emergency applications} - H04W 24/04: Arrangements for maintaining operational condition - H04W 40/02: Communication route or path selection, e.g. power-based or shortest path routing - H04W 76/50: for emergency connections - H04M 2207/18: wireless networks - H04M 2242/04: for emergency applications - H04W 76/15: Setup of multiple wireless link connections - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) ## Abstract Methods and apparatus for providing useful data in association with a high-priority call such as an emergency call. In one embodiment, the data comprises a data (e.g., an MSD or FSD) embedded within one or more real-time protocol packets such as RTP Control Protocol (RTCP) packets, that are interspersed within the voice or user data stream (carried in e.g., RTP packets) of an emergency call. Apparatus and methods are described for transmitting the data portion reliably from the initiating terminal (e.g., an in-vehicle system) to a Public Safety Answering Point (PSAP), by using the same transport connection as the user data. ## Claims ### Claim 1 A method of initiating an emergency call from a source to a destination via a cellular network, comprising: prior to an indication associated with the emergency call reaching the destination, determining if both a circuit-switched cellular network route and a packet-switched cellular network route are available to initiate the emergency call from the source to the destination; when both routes are available, evaluating the packet-switched cellular network route against at least one selection criteria; when the at least one selection criteria is satisfied, initiating the emergency call over the packet-switched cellular network route; and when the at least one selection criteria is not satisfied, initiating the emergency call over the circuit-switched cellular network route. ### Claim 2 (depends on 1) The method of claim 1, wherein, when only the circuit-switched cellular network route is available, the method further comprises: initiating the call over the circuit-switched cellular network route. ### Claim 3 (depends on 1) The method of claim 1, wherein, when the emergency call is initiated over the packet-switched cellular network route, the method further comprises: generating a composite stream having a first stream and one or more second streams, the first stream including encoded voice packets in a substantially continuous manner and the one or more second streams including data packets, the data packets of the second stream being into interspersed with the first stream. ### Claim 4 (depends on 3) The method of claim 3, further comprising: establishing a session, the session carrying the composite stream. ### Claim 5 (depends on 4) The method of claim 4, wherein the session is initiated using a Session Initiation Protocol (SIP). ### Claim 6 (depends on 1) The method of claim 1, further comprising: indicating an emergency call status in the emergency call. ### Claim 7 (depends on 1) The method of claim 1, wherein the selection criteria include at least one of congestion, latency, reliability and available payload. ### Claim 8 A device, comprising: a processor; a transceiver configured to initiate a voice call with a further device; and a non-transitory computer readable storage medium that stores a set of instructions executable by the processor, wherein the set of instructions causes the processor to: determine if both a circuit-switched cellular network route and a packet-switched cellular network route are available to initiate the voice call from the device to the further device prior to an indication associated with the voice call reaching the further device; evaluate the packet-switched cellular network route against at least one selection criteria when both routes are available; initiate the voice call over the packet-switched cellular network route when the at least one selection criteria is satisfied; and initiate the voice call over the circuit-switched cellular network route when the at least one selection criteria is not satisfied. ### Claim 9 (depends on 8) The device of claim 8, wherein the set of instructions further causes the processor to: initiate the voice call over the circuit-switched cellular network route when only the circuit-switched cellular network route is available. ### Claim 10 (depends on 8) The device of claim 8, wherein the set of instructions further causes the processor to: generate a composite stream having a first stream and one or more second streams, the first stream including encoded voice packets in a substantially continuous manner and the one or more second streams including data packets, the data packets being interspersed with the first stream, when the voice call is initiated over the packet-switched cellular network route. ### Claim 11 (depends on 10) The device of claim 10, wherein the set of instructions further causes the processor to: initiate establishing a session, the session carrying the composite stream. ### Claim 12 (depends on 11) The device of claim 11, wherein the session is initiated using a Session Initiation Protocol (SIP). ### Claim 13 (depends on 8) The device of claim 8, wherein the set of instructions further causes the processor to: indicate an emergency call status in the voice call. ### Claim 14 (depends on 8) The device of claim 8, wherein the selection criteria include at least one of congestion, latency, reliability and available payload. ### Claim 15 An integrated circuit, comprising: circuitry to determine if both a circuit-switched cellular network route and a packet-switched network cellular route are available to initiate a voice call from a source to a destination, prior to an indication associated with the voice call reaching the destination; circuitry to evaluate the packet-switched cellular network route against at least one selection criteria when both routes are available; circuitry to initiate the voice call over the packet-switched cellular network route when the at least one selection criteria is satisfied; and circuitry to initiate the voice call over the circuit-switched cellular network route when the at least one selection criteria is not satisfied. ### Claim 16 (depends on 15) The integrated circuit of claim 15, further comprising: circuitry to initiate the voice call over the circuit-switched cellular network route when only the circuit-switched cellular network route is available. ### Claim 17 (depends on 15) The integrated circuit of claim 15, further comprising: circuitry to generate a composite stream having a first stream and one or more second streams, the first stream including encoded voice packets in a substantially continuous manner and the one or more second streams including data packets, the data packets being interspersed with the first stream, when the voice call is initiated over the packet-switched cellular network route. ### Claim 18 (depends on 17) The integrated circuit of claim 17, further comprising: circuitry to establish a session, the session carrying the composite stream. ### Claim 19 (depends on 15) The integrated circuit of claim 15, further comprising: circuitry to indicate an emergency call status in the voice call. ### Claim 20 (depends on 15) The integrated circuit of claim 15, wherein the selection criteria include at least one of congestion, latency, reliability and available payload.