# US 7,609,684 B2 · Local soft switch and method for connecting to and providing access to a TDM network

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- Number: US 7,609,684 B2
- Document ID: US7609684B2
- Status: Granted
- Kind: B2
- Application number: 10/544,417
- Filed: 2004-02-03
- Published: 2006-08-10
- Granted: 2009-10-27
- Earliest claimed: 2003-02-04
- Assignees: Nokia Siemens Networks Oy
- Inventors: Jack Bloch; Uwe Grothe; Amruth Laxman; Narendar Reddy; Salim Saba; Robert S. Stockdale
- Web page: https://patentgrep.com/patent/US7609684B2

## CPC

- H04J 3/00: Time-division multiplex systems (H04J14/00 takes precedence; relay systems H04B7/14; selecting techniques H04Q)
- H04Q 3/0016: {Arrangements providing connection between exchanges}
- H04Q 3/0025: {Provisions for signalling}
- H04Q 2213/13034: A/D conversion, code compression/expansion
- H04Q 2213/13106: Microprocessor, CPU
- H04Q 2213/13196: Connection circuit/link/trunk/junction, bridge, router, gateway
- H04Q 2213/13292: Time division multiplexing, TDM
- H04Q 2213/13389: LAN, internet
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W)

## Abstract

A remote switch for connecting to and providing access to a TDM network. A switch resident of a non-TDM network implements control of various components in order to effectuate telecommunications in the non-TDM network. An access gateway at a remote location connects to the TDM network. The switch accesses the TDM network through the access gateway via the connection.

## Claims

### Claim 1

A remote switch for connecting to and providing IP access and services to a TDM network, comprising:
a first switch implemented in a non-TDM network for controlling various components in order to effectuate telecommunications in the non-TDM network;
an access gateway, at a remote location from the first switch, having a connection to the TDM network and handling TDM switching and networking for the first switch;
a processor incorporated in the first switch that provides communication adaptation between Ethernet and LAPD by performing protocol conversions using a stored mapping table;
communication channels connecting the first switch and access gateway, said communication channels obviating a need for TDM links between the TDM network and the first switch;
the first switch accessing the TDM network through the access gateway via the connection channels, to provide IP access and services to the TDM network;
the processor being assigned an MCP multicast address to participate in LAN monitoring; and
the first switch being configured to restrict trunk groups from crossing access gateway boundaries.

### Claim 2 (depends on 1)

The remote switch according to claim 1, wherein the switch offers call services and capabilities of the non-TDM network.

### Claim 3 (depends on 1)

The remote switch according to claim 1, wherein the switch is an IP switch.

### Claim 4 (depends on 1)

The remote switch according to claim 1, wherein the processor manages NSP-LTG message transport.

### Claim 5 (depends on 1)

The remote switch according to claim 1, wherein the access gateway includes at least one LTG.

### Claim 6 (depends on 1)

The remote switch according to claim 1, wherein the access gateway includes an RTI.

### Claim 7 (depends on 1)

The remote switch according to claim 1, wherein the access gateway includes a DLU.

### Claim 8 (depends on 1)

The remote switch according to claim 1, further comprising a user interface for interfacing a user to the switch.

### Claim 9 (depends on 1)

The remote switch according to claim 1, further comprising a lawful intercept processor for intercepting calls and forwarding them to a law enforcement operator.

### Claim 10

A method for connecting to and providing IP access and services to a TDM network, comprising:
implementing control of various components using a switch in order to effectuate telecommunications in a non-TDM network;
accessing the TDM network through an access gateway remote to the switch connection to the TDM network;
handling TDM switching and networking for the switch by the access gateway;
providing communication adaptation at the switch between Ethernet and LAPD by performing protocol conversions using a stored mapping table, the communication adaptation being performed using a processor that is assigned an MCP multicast address to participate in LAN monitoring;
connecting the switch and access gateway through communication channels wherein the communication channels obviate a need for TDM links between the TDM network and the switch;
the switch accessing the TDM network through the access gateway via the connection to provide IP access and services to the TDM network;
the switch additionally restricting trunk groups from crossing access gateway boundaries.

### Claim 11 (depends on 10)

The method according to claim 10, further offering call services and capabilities of the non-TDM network.

### Claim 12 (depends on 10)

The method according to claim 10, wherein the switch is an IP switch.

### Claim 13 (depends on 10)

The method according to claim 10, further managing NSP-LTG message transport.

### Claim 14 (depends on 10)

The method according to claim 10, further interfacing a user to the switch.

### Claim 15 (depends on 10)

The method according to claim 10, further comprising intercepting calls and forwarding them to a law enforcement operator.