Secure atm-based distributed virtual tandem switching system and method
AssigneeSBC Technology Resources, Inc.
InventorsHaifeng BI, Matthew STAFFORD, Tina SIGARTO
Life of this patent
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Abstract
Narrowband signaling from a transfer node for a call originating at an end office is received at a centralized control and signaling interworking function device in an asynchronous transfer mode switching network. The received narrowband signaling is converted to broadband signaling. The broadband signaling is provided to a plurality of trunk interworking function devices via the asynchronous transfer mode switching network, to establish a connection across the asynchronous transfer mode switching network, when the centralized control and signaling interworking function device and the plurality of trunk interworking function devices are determined to be members of a closed user group.
Claims20
A method of communicating in an asynchronous transfer mode distributed virtual tandem switching system, comprising:
- receiving, at a centralized control and signaling interworking function device in an asynchronous transfer mode switching network, narrowband signaling from a transfer node for a call originating at an end office;
- converting the received narrowband signaling to broadband signaling;
- and
- providing the broadband signaling to a plurality of trunk interworking function devices via the asynchronous transfer mode switching network, to establish a connection across the asynchronous transfer mode switching network, when the centralized control and signaling interworking function device and the plurality of trunk interworking function devices are determined to be members of a closed user group.
An asynchronous transfer mode distributed virtual tandem switching system centralized control and signaling interworking function device in an asynchronous transfer mode switching network, comprising:
- a receiver that receives narrowband signaling from a transfer node for a call originating at an end office;
- a converter that converts the received narrowband signaling to broadband signaling, and
- a provider that provides the broadband signaling to a plurality of trunk interworking function devices via the asynchronous transfer mode switching network, to establish a connection across the asynchronous transfer mode switching network, when the centralized control and signaling interworking function device and the plurality of trunk interworking function devices are determined to be members of a closed user group.
A computer readable medium for storing a program for communicating in an asynchronous transfer mode distributed virtual tandem switching system, comprising:
- a receiving segment that receives, at a centralized control and signaling interworking function device in an asynchronous transfer mode switching network, narrowband signaling from a transfer node for a call originating at an end office;
- a converting segment that converts the received narrowband signaling to broadband signaling;
- and
- a providing segment that provides the broadband signaling to a plurality of trunk interworking function devices via the asynchronous transfer mode switching network, to establish a connection across the asynchronous transfer mode switching network, when the centralized control and signaling interworking function device and the plurality of trunk interworking function devices are determined to be members of a closed user group.
Dependencies are inferred from the claim text.