# US 8,787,889 B2 · Conferencing system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,889 B2 - Document ID: US8787889B2 - Status: Granted - Kind: B2 - Application number: 12/838,947 - Filed: 2010-07-19 - Published: 2011-01-20 - Granted: 2014-07-22 - Earliest claimed: 2002-08-28 - Assignees: Nokia Corporation - Applicants: Aki Niemi - Inventors: Aki Niemi - Web page: https://patentgrep.com/patent/US8787889B2 ## CPC - H04M 3/56: Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities (video conference systems H04N7/15) - H04L 61/00: Network arrangements, protocols or services for addressing or naming - H04L 61/10: of different types - H04W 8/26: Network addressing or numbering for mobility support - H04W 80/04: Network layer protocols, e.g. mobile IP [Internet Protocol] - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 72/27: between access points - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) - 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 A method for administering conferencing resources in a communications system comprising a plurality of terminals and a conference server, the method comprising: transmitting from a first terminal to the server a first message comprising a request for a resource capable of sustaining a conference call; allocating by means of the server a network address identifying a resource capable of sustaining the conference call; and transmitting from the server to the first terminal a second message comprising the network address. ## Claims ### Claim 1 A method comprising: transmitting to a conference server a first message comprising a request for a resource capable of sustaining a conference call; receiving from the conference server a second message comprising a dynamic uniform resource identifier for identifying a resource capable of sustaining the conference call which has been allocated by the conference server; and transmitting a third message comprising the dynamic uniform resource identifier to a user agent; wherein the received second message specifies that the resource is being allocated a respective address of a corresponding plurality of addresses, the respective address being unique to the conference call at any given time; and wherein each of the corresponding plurality of addresses are allocated according to a pre-set pattern such that the respective address refers to a resource that is available for the conference call at the given time. ### Claim 2 (depends on 1) The method of claim 1 wherein the first message comprises a first session initiation protocol invite message. ### Claim 3 (depends on 2) The method of claim 2 further comprising: sending a second session initiation protocol invite message comprising the dynamic uniform resource identifier to the resource capable of sustaining the conference call. ### Claim 4 (depends on 1) The method of claim 1 wherein the second message comprises a session initiation protocol 3xx redirection message. ### Claim 5 (depends on 4) The method of claim 4 wherein the redirection message comprises a contact header containing the dynamic uniform resource identifier. ### Claim 6 (depends on 1) The method of claim 1 further comprising receiving a session initiation protocol 200 OK message from the resource capable of sustaining the conference call. ### Claim 7 (depends on 1) The method of claim 1 wherein the third message comprises a session initiation protocol refer message to the user agent. ### Claim 8 (depends on 7) The method of claim 7 wherein the session initiation protocol refer message comprises a refer-to header comprising the dynamic uniform resource identifier. ### Claim 9 (depends on 8) The method of claim 8 further comprising receiving a session initiation protocol accepted message from the user agent. ### Claim 10 A computer readable medium encoded with instructions for performing a method when run on a computer, the method comprising: transmitting to a conference server a first message comprising a request for a resource capable of sustaining a conference call; receiving from the conference server a second message comprising a dynamic uniform resource identifier for identifying a resource capable of sustaining the conference call which has been allocated by the conference server; and transmitting a third message comprising the dynamic uniform resource identifier to a user agent; wherein the received second message specifies that the resource is being allocated a respective address of a corresponding plurality of addresses, the respective address being unique to the conference call at any given time; and wherein each of the corresponding plurality of addresses are allocated according to a pre-set pattern such that the respective address refers to a resource that is available for the conference call at the given time. ### Claim 11 (depends on 10) The computer readable medium of claim 10 wherein the first message comprises a first session initiation protocol invite message. ### Claim 12 (depends on 11) The computer readable medium of claim 11 further comprising instructions for sending a second session initiation protocol invite message comprising the dynamic uniform resource identifier to the resource capable of sustaining the conference call. ### Claim 13 (depends on 10) The computer readable medium of claim 10 wherein the second message comprises a session initiation protocol 3xx redirection message. ### Claim 14 (depends on 13) The computer readable medium of claim 13 wherein the redirection message comprises a contact header containing the dynamic uniform resource identifier. ### Claim 15 (depends on 10) The computer readable medium of claim 10 further comprising receiving a session initiation protocol 200 OK message from the resource capable of sustaining the conference call. ### Claim 16 (depends on 10) The computer readable medium of claim 10 wherein the third message comprises a session initiation protocol refer message to the user agent. ### Claim 17 (depends on 16) The computer readable medium of claim 16 wherein the session initiation protocol refer message comprises a refer-to header comprising the dynamic uniform resource identifier. ### Claim 18 (depends on 17) The computer readable medium of claim 17 further comprising receiving a session initiation protocol accepted message from the user agent. ### Claim 19 An apparatus comprising at least one processor and at least one memory including computer program code for one or more programs, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus to perform at least the following: transmitting to a conference server a first message comprising a request for a resource capable of sustaining a conference call; receiving from the conference server a second message comprising a dynamic uniform resource identifier for identifying a resource capable of sustaining the conference call which has been allocated by the conference server; and transmitting a third message comprising the dynamic uniform resource identifier to a user agent; wherein the received second message specifies that the resource is being allocated a respective address of a corresponding plurality of addresses, the respective address being unique to the conference call at any given time; and wherein each of the corresponding plurality of addresses are allocated according to a pre-set pattern such that the respective address refers to a resource that is available for the conference call at the given time. ### Claim 20 (depends on 19) The apparatus of claim 19 wherein the first message comprises a first session initiation protocol invite message. ### Claim 21 (depends on 20) The apparatus of claim 20 wherein the computer program code is further configured to cause the apparatus to send a second session initiation protocol invite message comprising the dynamic uniform resource identifier to the resource capable of sustaining the conference call. ### Claim 22 (depends on 19) The apparatus of claim 19 wherein the second message comprises a session initiation protocol 3xx redirection message. ### Claim 23 (depends on 22) The apparatus of claim 22 wherein the redirection message comprises a contact header containing the dynamic uniform resource identifier. ### Claim 24 (depends on 19) The apparatus of claim 19 further comprising receiving a session initiation protocol 200 OK message from the resource capable of sustaining the conference call. ### Claim 25 (depends on 19) The apparatus of claim 19 wherein the third message comprises a session initiation protocol refer message to the user agent. ### Claim 26 (depends on 25) The apparatus of claim 25 wherein the session initiation protocol refer message comprises a refer-to header comprising the dynamic uniform resource identifier. ### Claim 27 (depends on 26) The apparatus of claim 26 further comprising receiving a session initiation protocol accepted message from the user agent.