Call setup using voice over the internet protocol (VoIP)
First Claim
1. In a system comprising a first telephony network, a second telephony network, and a packet switched data network connecting the first telephony network to the second telephony network, a method of performing call setup through the packet switched network for a call originated at said first telephony network toward said second telephony network, comprising the steps of:
- at an interface for said first telephony network in said packet switched network, receiving information on resource status in the second telephony network using an out of band signaling protocol; and
when said information on resource status indicates that resources are available in said second telephony network to complete setup of the call therein, implementing call setup for the call through said packet switched data network with a separate call signaling protocol, there being no communication path for the call through the packet switched data network prior thereto.
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Accused Products
Abstract
A method of performing call setup in a system comprises an origination telephony network, a termination telephony network and a packet switched data network interconnecting therebetween comprises steps of implementing call setup across the two telephony networks by SS7 protocol and implementing call setup within the packet switched data network by H. 323 protocol. In particular, the call setup in the data network is not started until information of the resources status in the termination telephony network is available. A novel gateway is provided to implement the method, which comprises both SS7 capabilities and H. 323 functionalities.
3 Citations
24 Claims
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1. In a system comprising a first telephony network, a second telephony network, and a packet switched data network connecting the first telephony network to the second telephony network, a method of performing call setup through the packet switched network for a call originated at said first telephony network toward said second telephony network, comprising the steps of:
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at an interface for said first telephony network in said packet switched network, receiving information on resource status in the second telephony network using an out of band signaling protocol; and when said information on resource status indicates that resources are available in said second telephony network to complete setup of the call therein, implementing call setup for the call through said packet switched data network with a separate call signaling protocol, there being no communication path for the call through the packet switched data network prior thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A communication system, comprising:
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a first PSTN portion (Public Switched Telephone Network); a second PSTN portion; and an Internet Protocol network connecting the first PSTN portion to the second PSTN portion, wherein the system is operable to; implement network availability communication between the first PSTN portion and the second PSTN portion with SS7 telephony signaling protocol prior to reservation of resources for call completion in the Internet Protocol network, and reserve said resources and utilize media communications through said Internet Protocol network if and after said network availability communication indicates that said second PSTN portion has available resources. - View Dependent Claims (17)
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18. A communication network, comprising:
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a first PSTN (Public Switched Telephone Network) serving as an origination leg of the communication network; a second PSTN serving as a termination leg of the communication network; a packet switched data network (DN) connecting the first PSTN to the second PSTN and operable, upon an occurrence of call setup confirmation in the second PSTN, to establish communication connectivity between the first and second PSTNs, the DN interfacing to the first PSTN through an origination gateway and to the second PSTN through a termination gateway; and an SS7 signaling network extending from the origination gateway to the termination gateway, and operable to conduct network availability communication between the two gateways. - View Dependent Claims (19, 20, 21)
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22. A method for setting up a call in a communications system having a first PSTN, a second PSTN, and a packet-switched data network bridging the first PSTN and the second PSTN, the method comprising:
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determining whether resources in the second PSTN are available to take the call initiated in the first PSTN; issuing a resource-availability confirmation message from the second PSTN if resources are available therein to take the call; and conducting call setup signaling within the data network only after receiving the resource-availability confirmation message from the second PSTN. - View Dependent Claims (23, 24)
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Specification