Device and method for establishing a call connection
First Claim
1. A device (V) for establishing a call connection between at least two subscriber terminals (T1, T2), which has a first interface (IF1) to a packet-switched data network (INET) and means (IP, KOMP) for establishing connections by way of the packet-switched data network (INET), characterized by means ofa second interface (IF2) to a connection-oriented telecommunication network (PSTN), in which a transmission channel with a set transmission band width can be furnished, a monitoring device (MON) for determining a current data throughput in the data network (INET), a control device (SW) for comparing the current data throughput with a set threshold value and for controlling the establishment of connections in such a way that the call connection is established by way of the data network (INET) when the data throughput lies above the threshold value and is established by way of the telecommunication network (PSTN) when the data throughput lies below the threshold value.
1 Assignment
0 Petitions
Accused Products
Abstract
Call connections by way of the Internet (internet telephony) are less expensive than ones by way of an open telephone network. However, no fixed transmission rates are guaranteed in the Internet, which can lead to losses in the quality of transmitted speech signals. A device (V) for establishing a call connection between two subscriber terminals (T1, T2) has a first interface (IF1) to a packet-switched data network (INET) and means (IP, KOMP) for establishing connections by way of the packet-switched data network (INET) as well as a second interface (IF2) to a connection-oriented telecommunication network (PSTN), in which a transmission channel with a predetermined transmission band width can be furnished. By means of a monitoring device (MON), the device (V) determines a current data throughput in the data network (INET). A control device (SW) of the device (V) compares the current data throughput with a predetermined threshold value and controls the establishment of connections in such a way that the call connection is established by way of the data network (INET) when the data throughput lies above the threshold value and is established by way of the telecommunication network (PSTN) when the data throughput lies below the threshold value.
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Citations
10 Claims
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1. A device (V) for establishing a call connection between at least two subscriber terminals (T1, T2), which has a first interface (IF1) to a packet-switched data network (INET) and means (IP, KOMP) for establishing connections by way of the packet-switched data network (INET), characterized by means of
a second interface (IF2) to a connection-oriented telecommunication network (PSTN), in which a transmission channel with a set transmission band width can be furnished, a monitoring device (MON) for determining a current data throughput in the data network (INET), a control device (SW) for comparing the current data throughput with a set threshold value and for controlling the establishment of connections in such a way that the call connection is established by way of the data network (INET) when the data throughput lies above the threshold value and is established by way of the telecommunication network (PSTN) when the data throughput lies below the threshold value.
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8. A subscriber terminal (T1) in which two channels to a digital, connection-oriented communication network (PSTN) can be furnished in parallel, characterized in that it contains a device (V) for establishing a call connection between the subscriber terminal (T1) and another subscriber terminal (T2), the device (V) having a first interface (IF1) to a packet-switched data network (INET) and means (IP, KOMP) for establishing connections by way of the packet-switched data network (INET), the device (V) in turn characterized in that it includes:
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a second interface (IF2) to a connection-oriented telecommunication network (PSTN), in which a transmission channel with a set transmission band width can be furnished, a monitoring device (MON) for determining a current data throughput in the data network (INET), a control device (SW) for comparing the current data throughput with a set threshold value and for controlling the establishment of connections in such a way that the call connection is established by way of the data network (INET) when the data throughput lies above the threshold value and is established by way of the telecommunication network (PSTN) when the data throughput lies below the threshold value, wherein the first interface (IF1) and the second interface (IF2) are respectively connected to one of the two channels, and further wherein a connection to a provider of the packet-switched data network can be furnished by way of the channel connected to the first interface (IF1).
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9. A telecommunications system (PABX1, PABX2) having a large number of connections for subscriber terminals (T1, T2), characterized in that it includes a subscriber terminal (T1) that in turn includes a device (V) for establishing a call connection between the subscriber terminal (T1) and another subscriber terminal (T2), the device (V) having a first interface (IF1) to a packet-switched data network (INET) and means (IP, KOMP) for establishing connections by way of the packet-switched data network (INET), the device (V) in turn characterized in that it includes:
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a second interface (IF2) to a connection-oriented telecommunication network (PSTN), in which a transmission channel with a set transmission band width can be furnished, a monitoring device (MON) for determining a current data throughput in the data network (INET), a control device (SW) for comparing the current data throughput with a set threshold value and for controlling the establishment of connections in such a way that the call connection is established by way of the data network (INET) when the data throughput lies above the threshold value and is established by way of the telecommunication network (PSTN) when the data throughput lies below the threshold value, wherein in providing at least one of the connections for the subscriber terminal (T1), the control device (V) couples either the first interface (IF1) or the second interface (IF2) to the subscriber terminal (T1).
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10. A method for establishing a call connection from a calling subscriber terminal (T1), which is connected to a device (V) for establishing the call connection, to at least one called subscriber terminal (T2), with the following steps:
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connection of the calling subscriber terminal (T1) with a packet-switched data network (INET) by way of a first interface (IF1) of the device (V), connection of the calling subscriber terminal (T1) to a connection-oriented telecommunication network (PSTN), in which a transmission channel with a predetermined transmission band width can be furnished, by way of a second interface (IF2) of the device (V), determination of a current data throughput in the packet-switched data network (INET), comparison of the current data throughput with a predetermined threshold value, and control of the establishment of connections in such a way that the call connection is established by way of the data network (INET) when the data throughput lies above the threshold value and is established by way of the communication-oriented telecommunication network (PSTN) when the data throughput lies below the threshold value.
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Specification