# US 2008/0187124 A1 · Private-Branch Exchange that Provides Call Bridging to an Off-Premises Terminal in the Presence of a Third-Party Application > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0187124 A1 - Document ID: US20080187124A1 - Status: Published application - Kind: A1 - Application number: 11/671,444 - Filed: 2007-02-05 - Published: 2008-08-07 - Earliest claimed: 2007-02-05 - Assignees: Avaya Technology Corp. - Inventors: Sandra R. Abramson; Stephen M. Milton - Web page: https://patentgrep.com/patent/US20080187124A1 ## CPC - H04M 3/42263: {where the same subscriber uses different terminals, i.e. nomadism} - H04M 3/42323: {PBX's with CTI arrangements} - H04M 2203/1091: Fixed mobile conversion - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) ## Abstract A telecommunications system is disclosed that enables a user to pair a desk set that is an extension of a private-branch exchange with a cell phone that is accessible via the Public Switched Telephone Network. One feature of the telecommunications system enables an active call that is between the desk set and another party, to be transferred to the user's cell phone, while in the presence of third-party call control. This is advantageous because a user who is initially on a call at her desk set, but needs to get somewhere else (e.g., a meeting, the airport, home, etc.), is able to continue the call by transferring it to her cell phone. The third-party call control can be part of a computer-telephony integration (CTI) application—for example, in a telephone telemarketing center, which concurrently handles many active telephone calls. ## Claims ### Claim 1 A method comprising: receiving a request to bridge an active call, which exists between a telephone number D and a telephone number T, to a telephone number C; allocating, from a pool of ports, a port P that is capable of emulating a telephone extension; and establishing a resultant call between said telephone number T and said telephone number C, said resultant call being based on said active call and on at least one precursor call having been made that includes port P; wherein said telephone number C is associated with said telephone number D in a data structure and is within the address space of the Public Switched Telephone Network; and wherein said telephone number D is within the address space of a private-branch exchange. ### Claim 2 (depends on 1) The method of claim 1 wherein establishing said resultant call comprises: (1) establishing a first precursor call from said port P to said telephone number D; and (2) establishing a second precursor call from said telephone number D to said port P. ### Claim 3 (depends on 2) The method of claim 2 wherein establishing said resultant call further comprises extending said first precursor call to said telephone number C. ### Claim 4 (depends on 3) The method of claim 3 wherein establishing said resultant call further comprises combining said first precursor call and said second precursor call with said active call to generate said resultant call. ### Claim 5 (depends on 1) The method of claim 1 wherein establishing said resultant call comprises directing a first precursor call to be placed from said port P to said telephone number D. ### Claim 6 (depends on 5) The method of claim 5 wherein establishing said resultant call comprises extending said first precursor call to said telephone number C. ### Claim 7 (depends on 1) The method of claim 1 wherein establishing said resultant call comprises: (1) enabling a capability that extends calls to said telephone number C that are placed to said telephone number D; (2) directing a first precursor call to be established from said port P to said telephone number D; (3) directing said active call to be placed on hold; and (4) directing a second precursor call to be established from said telephone number D to said port P. ### Claim 8 (depends on 7) The method of claim 7 wherein establishing said resultant call further comprises: directing said second precursor call to be transferred to said active call; and directing said first precursor call to be transferred to said active call to generate said resultant call. ### Claim 9 (depends on 1) The method of claim 1 further comprising placing said active call on hold. ### Claim 10 A method comprising: receiving at least one message, wherein said at least one message conveys a directive to bridge an active call, which exists between a telephone number D and a telephone number T, to a telephone number C; establishing a first precursor call from a port P to a telephone number D and a telephone number C, wherein said port P is capable of emulating a telephone extension; placing said active call on hold at said telephone number D; establishing a second precursor call from said telephone number D; and combining said first precursor call and said second precursor call with said active call to generate a resultant call between said telephone number T and said telephone number C. ### Claim 11 (depends on 10) The method of claim 10 wherein said telephone number C is associated with said telephone number D in a data structure. ### Claim 12 (depends on 11) The method of claim 11 wherein said telephone number C is within the address space of the Public Switched Telephone Network; and wherein said telephone number D is within the address space of a private-branch exchange. ### Claim 13 (depends on 10) The method of claim 10 wherein said at least one message comprises: (1) a first message that directs the enabling of the extending of calls that are placed to said telephone number D, to a telephone number of an affiliated terminal; (2) a second message that directs the placing of said first precursor call; and (3) a third message that directs the placing of said first precursor call on hold. ### Claim 14 (depends on 13) The method of claim 13 wherein said at least one message further comprises: (4) a fourth message that directs the placing of said active call on hold; (5) a fifth message that directs the placing of said second precursor call; (6) a sixth message that directs the answering of said second precursor call; and (7) a seventh message that directs the placing of said second precursor call on hold. ### Claim 15 (depends on 10) The method of claim 10 wherein said combining comprises: retrieving said active call on hold at said telephone number D; and merging said second precursor call into said active call such that as the result of the merging, said active call includes said telephone number T and said port P. ### Claim 16 (depends on 15) The method of claim 15 wherein said combining further comprises: merging said first precursor call into said active call that includes said telephone number T and said port P, to generate said resultant call; and deallocating said port P. ### Claim 17 A method comprising: receiving: (1) a notification of an active call, which exists between a telephone number D and a telephone number T, and (2) a request to bridge said active call to a telephone number C; determining that a port P is available for use, wherein said port P is capable of emulating a telephone extension; and directing: (1) a first precursor call to be placed from said port P to said telephone number D, (2) said active call to be placed on hold at said telephone number D, (3) a second precursor call to be placed from said telephone number D to said port P, and (4) said first precursor call, said second precursor call, and said active call to be combined to generate a resultant call between said telephone number T and said telephone number C. ### Claim 18 (depends on 17) The method of claim 17 wherein directing comprises the transmission of: a first message that directs the enabling of the extending of calls that are placed to said telephone number D, to a telephone number of an affiliated terminal; a second message that directs the placing of said first precursor call; and a third message that directs the placing of said first precursor call on hold. ### Claim 19 (depends on 18) The method of claim 18 wherein directing further comprises the transmission of: a fourth message that directs the placing of said active call on hold; a fifth message that directs the placing of said second precursor call; a sixth message that directs the answering of said second precursor call; and a seventh message that directs the placing of said second precursor call on hold. ### Claim 20 (depends on 17) The method of claim 17 wherein directing said first precursor call, said second precursor call, and said active call to be combined comprises directing: (4.1) said active call on hold to be retrieved at said telephone number D, (4.2) said second precursor call to be transferred to said active call, and (4.3) said first precursor call to be transferred to said active call to generate said resultant call.