# US 8,571,019 B1 · In-band address tunneling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,571,019 B1 - Document ID: US8571019B1 - Status: Granted - Kind: B1 - Application number: 10/924,512 - Filed: 2004-08-23 - Granted: 2013-10-29 - Earliest claimed: 2004-08-23 - Assignees: Rockstar Consortium US LP - Applicants: Dany Sylvain - Inventors: Dany Sylvain - Web page: https://patentgrep.com/patent/US8571019B1 ## CPC - H04Q 3/0045: {involving hybrid, i.e. a mixture of public and private, or multi-vendor systems} - H04L 65/104: {in the network} - H04L 65/1069: Session establishment or de-establishment - H04Q 3/0025: {Provisions for signalling} - H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A packet communication address is delivered through in-band signaling over a circuit-switched network connection for a call, so the packet communication address can be used to establish a packet session outside the circuit-switched network. When the call is initiated from an initiating communication client to a terminating communication client using a directory number associated with the terminating communication client, a portion of the bearer path is established through the circuit-switched network between two network gateways. The packet communication address for the originating communication client may be received in a call establishment request by an originating network gateway. The originating network gateway will use in-band signaling over the bearer path to provide the packet communication address for the originating communication client to a terminating network gateway. Upon receipt of the packet communication address, the terminating network gateway will initiate transferring the call to a packet session established outside the circuit-switched network. ## Claims ### Claim 1 A method of operating a gateway comprising: a) receiving a request over a packet network from a service node to establish a call from a first communication client to a second communication client using a directory number associated with the second communication client, the request including a packet communication address associated with the first communication client; b) establishing a circuit-switched connection, which forms a portion of a bearer path for the call, over a circuit-switched telephone network with a network gateway associated with the second communication client; c) providing to the network gateway information bearing on the packet communication address for the first communication client using in-band signaling over the circuit-switched connection; d) effecting a transfer of the bearer path connection from the circuit-switched connection to a packet-switched connection; and e) receiving, via in-band signaling over the circuit-switched connection, information indicating that the call has been transferred, wherein traffic over the portion of the bearer path is digitized and transported in frames using a digital format comprising a plurality of bits, and the in-band signaling comprising replacing at least one of the plurality of bits in select ones of the frames with information corresponding to the packet communication address. ### Claim 2 (depends on 1) The method of claim 1 wherein the first and second communication clients are associated with directory numbers and the second communication client is associated with a packet communication address. ### Claim 3 (depends on 1) The method of claim 1 wherein a least significant bit of the digital format is replaced. ### Claim 4 (depends on 1) The method of claim 1 wherein a plurality of least significant bits of the digital format is replaced. ### Claim 5 (depends on 1) The method of claim 1 wherein the traffic is transported using time division multiplexing. ### Claim 6 A method of operating a gateway comprising: a) receiving a request over a packet-based network to establish a call from a first communication client to a second communication client using a directory number associated with the second communication client, the request including a packet communication address associated with the first communication client; b) forwarding the request towards the second communication client via a service node; c) establishing a circuit-switched connection, which forms a portion of a bearer path for the call, over a circuit-switched telephone network with a first network gateway associated with the first communication client; d) establishing a packet connection with the second communication client over the packet-based network; e) receiving information from the first network gateway bearing on the packet communication address for the first communication client using in-band signaling over the circuit-switched connection; f) transferring the call from the portion of the bearer path to a packet-based session; and g) providing, via in-band signaling over the circuit-switched connection, information indicating that the call has been transferred, wherein traffic over the portion of the bearer path is digitized and transported in frames using a digital format comprising a plurality of bits, and the in-band signaling comprising replacing at least one of the plurality of bits in select ones of the frames with information corresponding to the packet communication address. ### Claim 7 (depends on 6) The method of claim 6 wherein the first and second communication clients are associated with directory numbers and the second communication client is associated with a packet communication address. ### Claim 8 (depends on 6) The method of claim 6 further comprising obtaining the packet communication address for the second communication client. ### Claim 9 (depends on 6) The method of claim 6 further comprising keeping the call on the circuit-switched bearer path and using the packet-based session for exchanging packet-based information related to the call. ### Claim 10 (depends on 6) The method of claim 6 further comprising dropping the bearer path upon transferring the call to the packet-based session. ### Claim 11 (depends on 6) The method of claim 6 wherein the call is transferred in an automated fashion to the packet-based session without disrupting the call. ### Claim 12 (depends on 6) The method of claim 6 wherein the packet-based session does not traverse the circuit-switched telephone network. ### Claim 13 (depends on 6) The method of claim 6 wherein the call is established prior to receiving the information using the in-band signaling. ### Claim 14 (depends on 6) The method of claim 6 wherein the portion of the bearer path is established prior to the in-band signaling. ### Claim 15 (depends on 6) The method of claim 6 wherein a least significant bit of the digital format is replaced. ### Claim 16 (depends on 6) The method of claim 6 wherein a plurality of least significant bits of the digital format is replaced. ### Claim 17 (depends on 6) The method of claim 6 wherein the traffic is transported using time division multiplexing. ### Claim 18 (depends on 6) The method of claim 6, further comprising: h) releasing the circuit-switched connection and the packet connection after the call has been transferred. ### Claim 19 A gateway comprising: a) a plurality of communication interfaces; and b) a control system associated with the plurality of communication interfaces and configured to: i) receive a request over a packet network from a service node to establish a call from a first communication client to a second communication client using a directory number associated with the second communication client, the request including a packet communication address associated with the first communication client; ii) establish a circuit-switched connection, which forms a portion of a bearer path for the call, over a circuit-switched telephone network with a network gateway associated with the second communication client; iii) establish a packet connection, which forms the portion of the bearer path for the call, over the packet network with the first communication client; iv) provide to the network gateway information bearing on the packet communication address for the first communication client using in-band signaling over the circuit-switched connection; v) effect a transfer of the bearer path connection from the circuit-switched connection to a packet-switched connection; and vi) receive, via in-band signaling over the circuit-switched connection, information indicating that the call has been transferred, wherein traffic over the portion of the bearer path is digitized and transported in frames using a digital format comprising a plurality of bits, and the in-band signaling comprising replacing at least one of the plurality of bits in select ones of the frames with information corresponding to the packet communication address. ### Claim 20 (depends on 19) The system of claim 19 wherein the first and second communication clients are associated with directory numbers and the second communication client is associated with a packet communication address. ### Claim 21 (depends on 19) The system of claim 19 wherein a least significant bit of the digital format is replaced. ### Claim 22 (depends on 19) The system of claim 19 wherein a plurality of least significant bits of the digital format is replaced. ### Claim 23 (depends on 19) The system of claim 19 wherein the traffic is transported using time division multiplexing. ### Claim 24 (depends on 19) The gateway of claim 19, wherein the control system is further adapted to: vii) release the circuit-switched connection and the packet connection after the call has been transferred. ### Claim 25 A gateway comprising: a) a plurality of communication interfaces; and b) a control system associated with the plurality of communication interfaces and configured to: i) receive a request over a packet network to establish a call from a first communication client to a second communication client using a directory number associated with the second communication client, the request including a packet communication address associated with the first communication client; ii) forward the request towards the second communication client via a service node; iii) establish a circuit-switched connection, which forms a portion of a bearer path for the call, over a circuit-switched telephone network with a first network gateway associated with the first communication client; iv) establish a packet connection, which forms the portion of the bearer path for the call, over the packet network with the second communication client; v) transfer the call from the portion of the bearer path to a packet-based session; and vi) provide, via in-band signaling over the circuit-switched connection, information indicating that the call is being transferred, wherein traffic over the portion of the bearer path is digitized and transported in frames using a digital format comprising a plurality of bits, and the in-band signaling comprising replacing at least one of the plurality of bits in select ones of the frames with information corresponding to the packet communication address. ### Claim 26 (depends on 25) The system of claim 25 wherein the first and second communication clients are associated with directory numbers and the second communication client is associated with a packet communication address. ### Claim 27 (depends on 25) The system of claim 25 further comprising obtaining the packet communication address for the second communication client. ### Claim 28 (depends on 25) The system of claim 25 wherein the control system is further adapted to effect a transfer of the call to the packet-based session established between the first communication client and the second communication client using the packet communication address, which was received via the in-band signaling, for the first communication client. ### Claim 29 (depends on 28) The system of claim 28 wherein the control system is further adapted to drop the bearer path upon transferring the call to the packet-based session. ### Claim 30 (depends on 28) The system of claim 28 wherein the call is transferred to the packet-based session without disrupting the call in an automated fashion. ### Claim 31 (depends on 28) The system of claim 28 wherein the packet-based session does not traverse the circuit-switched telephone network. ### Claim 32 (depends on 25) The system of claim 25 wherein the call is established prior to receiving the information using the in-band signaling. ### Claim 33 (depends on 25) The system of claim 25 wherein the portion of the bearer path is established prior to the in-band signaling. ### Claim 34 (depends on 25) The system of claim 25 wherein a least significant bit of the digital format is replaced. ### Claim 35 (depends on 25) The system of claim 25 wherein a plurality of least significant bits of the digital format is replaced. ### Claim 36 (depends on 25) The system of claim 25 wherein the traffic is transported using time division multiplexing.