System and method for routing voice over IP calls
First Claim
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1. A voice over Internet (VOIP) system, comprising:
- at least one IP-based infrastructure component communicating with at least one wireless originating device;
at least one SIP server communicating with the infrastructure component; and
at least one modem bank associated with the SIP server and connected to a PSTN, the SIP server selectively using the modem bank to instantiate a circuit-switched call for encrypted intersystem calls from the originating device to a destination device.
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Abstract
An SIP server in an IP-based infrastructure supporting wireless telephones determines whether, based on the destination address in a call request, the call is an intrasystem call or an intersystem call. For intrasystem calls the SIP server routes VOIP packets directly between the originating and destination devices. For intersystem calls, however, and in particular encrypted calls, instead of routing the VOIP packets through the public Internet, the SIP server instantiates a circuit-switched call using a local modem bank connected to the PSTN. In this way, quality of service assurance is obtained and latency reduced.
168 Citations
13 Claims
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1. A voice over Internet (VOIP) system, comprising:
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at least one IP-based infrastructure component communicating with at least one wireless originating device;
at least one SIP server communicating with the infrastructure component; and
at least one modem bank associated with the SIP server and connected to a PSTN, the SIP server selectively using the modem bank to instantiate a circuit-switched call for encrypted intersystem calls from the originating device to a destination device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for VOIP, comprising:
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receiving from an originating wireless device in a first service system a call request for a destination device having an IP address;
determining whether the destination device is in the first service system;
if the destination device is in the first service system, establishing VOIP communication between the originating device and destination device within the first service system for encrypted calls without using the public Internet;
otherwise;
establishing a circuit-switched VOIP call between the destination device and originating device using the PSTN. - View Dependent Claims (9, 10, 11)
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12. A computer program device, comprising:
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means for receiving a call request at an SIP server, the call request being generated by a wireless communication originating device and indicating a destination device;
means for determining whether the destination device is registered with the SIP server;
means for transmitting IP packets between the destination device and originating device without using the public Internet when the destination device is registered with the SIP server; and
means for transmitting IP packets between the destination device and originating device using an instantiated circuit-switched connection for encrypted calls when the destination device is not registered with the SIP server. - View Dependent Claims (13)
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Specification