# US 11,122,092 B2 · System and method for prioritizing SIP registrations > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,122,092 B2 - Document ID: US11122092B2 - Status: Granted - Kind: B2 - Application number: 16/531,486 - Filed: 2019-08-05 - Published: 2021-02-11 - Granted: 2021-09-14 - Earliest claimed: 2019-08-05 - Assignees: Verizon Patent and Licensing Inc. - Applicants: Verizon Patent and Licensing Inc. - Inventors: Toby Varughese John; Shashi Kotvali; Bibi M. Hakimzadeh; James S. Abraham - Web page: https://patentgrep.com/patent/US11122092B2 ## CPC - H04L 65/1073: Registration or de-registration - H04L 47/24: Traffic characterised by specific attributes, e.g. priority or QoS - H04L 47/80: Actions related to the user profile or the type of traffic - H04L 47/821: {Prioritising resource allocation or reservation requests} - H04L 65/1016: IP multimedia subsystem [IMS] - H04L 65/1045: Proxies, e.g. for session initiation protocol [SIP] - H04L 65/1104: Session initiation protocol [SIP] - H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS] - H04W 12/06: Authentication - H04W 12/08: Access security - H04L 63/0892: {by using authentication-authorization-accounting [AAA] servers or protocols} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Systems and methods implement prioritized IP Multimedia System (IMS) registration procedures for Emergency and Priority Service users. A network device in an IMS network, receives, from a user equipment device, a Session Initiation Protocol (SIP) Register message that includes a priority indication. The network device detects the priority indication in the SIP Register message and provides, based on the priority indication, priority registration for the user equipment device when the network device is in an overloaded condition. ## Claims ### Claim 1 A method comprising: receiving, by a network device in an IP Multimedia System (IMS) network and from a user equipment device, a Session Initiation Protocol (SIP) Register message including a priority indication; detecting, by the network device, the priority indication in the SIP Register message; and providing, by the network device and based on the priority indication, priority registration for the user equipment device when the network device is in an overloaded condition, wherein providing the priority registration comprises: prioritizing selection of an Interrogating Call Session Control Function (I-CSCF), and forwarding the SIP Register message with the priority indication to the I-CSCF. ### Claim 2 (depends on 1) The method of claim 1, wherein detecting the priority indication further comprises: detecting a Resource-Priority Header (RPH) in the SIP Register message. ### Claim 3 (depends on 2) The method of claim 2, wherein the RPH includes a priority value for an Emergency Telecommunications Service or Wireless Priority Service. ### Claim 4 (depends on 1) The method of claim 1, wherein the priority indication corresponds to a designation for Emergency and Priority Service users. ### Claim 5 (depends on 1) The method of claim 1, wherein the network device includes a Proxy Call Session Control Function (P-CSCF). ### Claim 6 (depends on 1) The method of claim 1, further comprising: inserting, by the network device, the priority indication into a forwarded SIP register message toward another network device in the IMS network. ### Claim 7 (depends on 6) The method of claim 6, wherein the network device includes a Proxy Call Session Control Function (P-CSCF), and wherein the other network device includes a Serving Call Session Control Function (S-CSCF). ### Claim 8 (depends on 1) The method of claim 1, further comprising: sending, by the network device and via an Mw interface, another SIP Register message with the priority indication to another network device in the IMS network. ### Claim 9 (depends on 1) The method of claim 1, wherein providing priority registration further comprises: prioritizing sending a user authorization request for the UE device. ### Claim 10 A network device, comprising: a memory storing instructions; and a processor configured to execute the instructions to: receive, in an IP Multimedia System (IMS) network and from a user equipment device, a Session Initiation Protocol (SIP) Register message including a priority indication; detect the priority indication in the SIP Register message; and provide, based on the priority indication, priority registration for the user equipment device when the network device is in an overloaded condition, wherein providing the priority registration comprises: prioritizing selection of an Interrogating Call Session Control Function (I-CSCF), and forwarding the SIP Register message with the priority indication to the I-CSCF. ### Claim 11 (depends on 10) The network device of claim 10, wherein the priority indication includes a Resource-Priority Header (RPH) in the SIP Register message. ### Claim 12 (depends on 11) The network device of claim 11, wherein the RPH includes a priority value for an Emergency Telecommunications Service or Wireless Priority Service. ### Claim 13 (depends on 10) The network device of claim 10, wherein the network device includes a Proxy-Call Session Control Function (P-CSCF). ### Claim 14 (depends on 10) The network device of claim 10, wherein the processor is further configured to: insert the priority indication into a forwarded SIP register message toward another network device in the IMS network. ### Claim 15 (depends on 10) The network device of claim 10, wherein, when receiving the SIP register message, the processor is further configured to: receive the SIP register message via a Gm interface. ### Claim 16 (depends on 10) The network device of claim 10, wherein the processor is further configured to: send, via an Mw interface and based on the SIP Register message, another SIP Register message with the priority indication to another network device in the IMS network. ### Claim 17 A non-transitory computer-readable medium containing instructions executable by at least one processor, the computer-readable medium comprising one or more instructions to: receive, in an IP Multimedia System (IMS) network and from a user equipment device, a Session Initiation Protocol (SIP) Register message including a priority indication; detect the priority indication in the SIP Register message; and provide based on the priority indication, priority registration for the user equipment device when the network device is in an overloaded condition, wherein providing the priority registration comprises: prioritizing selection of an Interrogating Call Session Control Function (I-CSCF), and forwarding the SIP Register message with the priority indication to the I-CSCF. ### Claim 18 (depends on 17) The non-transitory computer-readable medium of claim 17, wherein the one or more instructions to detect the priority indication further include instructions to: detect a Resource-Priority Header (RPH) in the SIP Register message. ### Claim 19 (depends on 17) The non-transitory computer-readable medium of claim 17, further comprising one or more instructions to: insert the priority indication into a forwarded SIP register message toward another network device in the IMS network. ### Claim 20 (depends on 17) The non-transitory computer-readable medium of claim 17, wherein the one or more instructions to receive the SIP register message further include instructions to: receive the SIP register message via a Gm interface.