Telephony communication via varied redundant networks
First Claim
1. A method comprising:
- establishing a voice communication between a first terminal and a second terminal, including establishing a first communication link via a first packet switched network and between the first terminal and second terminal for use by the voice communication;
transmitting voice information between said first terminal and said second terminal over said first communication link;
monitoring quality of service of communication in said first packet switched network;
when said monitored quality of service does not meet a first threshold level, establishing a second communication link via only a second packet switched network and between said first terminal and second terminal for use by the voice communication, and transmitting voice information between said first terminal and said second terminal over said second communication link.
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Accused Products
Abstract
A switched telephone network is arranged in a manner to enable packet voice communication between telephone terminals via multiple redundant packet switched networks. The packet switched networks may utilize different protocols, be operated by different entities, and have primary functions other than voice communication. One example of such a network may be internetworked networks, such as the Internet. One example of an alternate packet switched network may be a network whose primary function is control of a circuit switched telephone network. The common channel interoffice switching system (CCIS) of a public switched telephone network (PSTN) is a preferred example.
A voice communication link may be established from telephone terminal to telephone terminal via the Internet, the quality of voice communication may be monitored, and the link may be transferred to the common channel interoffice signaling network if and when the quality of voice communication deteriorates beneath a pre-established norm. There is provided a means for monitoring the links of the common channel interoffice signaling system carrying the packetized voice communication and collecting the information needed to permit charging for the voice communication by time duration or by cells used to carry the packetized voice signal. The customer may be provided with the option of establishing the norm for diversion of the communication, or may elect which path is to be selected as the primary path.
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Citations
18 Claims
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1. A method comprising:
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establishing a voice communication between a first terminal and a second terminal, including establishing a first communication link via a first packet switched network and between the first terminal and second terminal for use by the voice communication; transmitting voice information between said first terminal and said second terminal over said first communication link; monitoring quality of service of communication in said first packet switched network; when said monitored quality of service does not meet a first threshold level, establishing a second communication link via only a second packet switched network and between said first terminal and second terminal for use by the voice communication, and transmitting voice information between said first terminal and said second terminal over said second communication link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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monitoring a quality of service metric of communications over a fast packet switched network, the quality of service metric including a measurement of unavailability conditions in response to call set-up messages; when said quality of service metric meets a threshold level, transmitting a first message to a plurality of switches, the first message indicating, that communications may be established using the first packet switched network; setting an indication in each of the plurality of the switches for the first packet switched network based on the first message; receiving at one of the plurality of switches a request to establish a voice communication between a first terminal and a second terminal, when the indication is set at the one of the plurality of switches for the first packet switched network, establishing said voice communication between said first terminal and second terminal via said first packet switched network and transmitting voice information between said first terminal and said second terminal over said first packet switched network; when the indication is not set at the one of the plurality of switches for the first packet switched network, establishing said voice communication between said first terminal and second terminal via a second packet switched network, and transmitting voice information between said first terminal and said second terminal over said second packet switched network. - View Dependent Claims (15, 16, 17)
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18. A method comprising:
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establishing a first voice communication link between a first terminal and a second terminal via a first packet switched network; transmitting voice information between said first terminal and said second terminal over said first voice communication link; monitoring quality of service on said first communication link; establishing a second voice communication link between said first terminal and second terminal via only a second packet switched network when said monitored quality of service does not meet a first threshold level.
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Specification