# US 8,787,162 B2 · Outgoing communication barring service in the IP multimedia subsystem > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,162 B2 - Document ID: US8787162B2 - Status: Granted - Kind: B2 - Application number: 13/473,797 - Filed: 2012-05-17 - Published: 2012-11-29 - Granted: 2014-07-22 - Earliest claimed: 2011-05-23 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Mikael Forsberg; Laszlo Balla; Hans Andersson - Inventors: Mikael Forsberg; Laszlo Balla; Hans Andersson - Web page: https://patentgrep.com/patent/US8787162B2 ## CPC - H04L 65/1016: IP multimedia subsystem [IMS] - H04L 65/1076: Screening of IP real time communications, e.g. spam over Internet telephony [SPIT] - H04L 65/1096: Supplementary features, e.g. call forwarding or call holding (systems providing special services or facilities to telephony subscribers H04M3/42) - H04L 65/4038: with floor control - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A user terminal may include an IP Multimedia Subsystem, IMS, client to enable the terminal to communicate with an IMS network. The IMS client may include a conference creation and control unit configured to create and control an IMS conference involving one or more participants, participants being identified within a conference INVITE or REFER message by respective Uniform Resource Identifiers, URIs, within a URI list. The conference creation and control unit may include a response handling unit configured to receive from the IMS network, in response to the sending of an INVITE or REFER, a SIP response message including an XML body specifying an Outgoing Communication Barring, OCB, service invocation result and configured to present the specified result to a terminal user. Related methods and application servers are also discussed. ## Claims ### Claim 1 A user terminal comprising: an IP Multimedia Subsystem, IMS, client configured to enable the terminal to communicate with an IMS network, the IMS client comprising, a conference creation and control circuit configured to create and control an IMS conference involving one or more participants, participants being identified within a conference INVITE or REFER message by respective Uniform Resource Identifiers, URIs, within a URI list, the conference creation and control circuit comprising a response handling circuit configured to receive for from said IMS network, in response to the sending of an INVITE or REFER, a SIP response message including an XML body specifying an Outgoing Communication Barring, OCB, service invocation result and configured to present the specified result to a terminal user, wherein the OCB service invocation result identifies one or more barred URIs from within the URI list. ### Claim 2 (depends on 1) A user terminal according to claim 1, said response handling circuit being configured to identify within a received response message a Session Description Protocol, SDP, part identifying an audio announcement to be played on the terminal, and to cause said audio announcement to be played. ### Claim 3 (depends on 1) A user terminal according to claim 1, wherein said SIP response message is one of a: SIP 183 Session Progress; SIP 603 Decline; SIP 202 Accepted; and SIP INFO. ### Claim 4 Apparatus configured to operate as an Application Server within an IP Multimedia Subsystem, IMS, network, the apparatus comprising: an Outgoing Communication Barring, OCB, service circuit configured to invoke an OCB service in respect of subscribed IMS users, the OCB service circuit being configured to receive an INVITE or REFER message relating to the establishment or control of a conference call, the INVITE or REFER message identifying one or more participants by way of Uniform Resource Identifiers, URIs, within a URI list, to determine an OCB service invocation result for the URI list, and to construct and send to the conference creator a SIP response message including an XML body specifying said OCB service invocation result, wherein the OCB service invocation result identifies one or more barred URIs from within the URI list. ### Claim 5 (depends on 4) Apparatus according to claim 4, said OCB service circuit being configured to include within said SIP response message a Session Description Protocol, SDP, part specifying an audio announcement to be played to the conference creator. ### Claim 6 (depends on 5) Apparatus according to claim 5, the OCB service circuit being configured to inform a Media Resource Function Controller, MRFC, of the IMS network of the URI of any participant barred from the conference as a result of said OCB service invocation for the purpose of allowing the MRFC to construct an audio announcement. ### Claim 7 (depends on 4) Apparatus according to claim 4, wherein said SIP response message is one of a: SIP 183 Session Progress; SIP 603 Decline; SIP 202 Accepted; and SIP INFO. ### Claim 8 (depends on 4) Apparatus according to claim 4, wherein said OCB service invocation result identifies for each of the one or more barred URIs a reason why the respective URI is barred. ### Claim 9 (depends on 4) Apparatus according to claim 4, the apparatus further comprising: a radio interface configured to enable the terminal to communicate with a cellular telecommunications network. ### Claim 10 A method of handling an INVITE or REFER message at an Application server implementing an Outgoing Communication Barring, OCB, service for an IMS user, the method comprising: receiving an INVITE or REFER message in respect of a conference call initiated by a conference creator, the message identifying one or more participants by way of Uniform Resource Identifiers, URIs, within a URI list; invoking an OCB service for the conference creator and applying the service to the INVITE or REFER message to determine an OCB service invocation result for the URI list; and constructing and sending to the conference creator a SIP response message including an XML body specifying said OCB service invocation result, wherein the OCB service invocation result identifies one or more barred URIs from within the URI list. ### Claim 11 (depends on 10) A method according to claim 10, wherein said SIP response message is one of a: SIP 183 Session Progress; SIP 603 Decline; SIP 202 Accepted; and SIP INFO. ### Claim 12 (depends on 10) A method according to claim 10, wherein said OCB service invocation result identifies for each of the one or more barred URIs a reason why the respective URI is barred.