Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Embedded VoIP Terminal Adapter for Residential Environments (EVITA)

IP.com Disclosure Number: IPCOM000019236D
Original Publication Date: 2003-Oct-25
Included in the Prior Art Database: 2003-Oct-25
Document File: 3 page(s) / 131K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

In commercial environments many hardware-based gateways exist that provide access to the PSTN (Public Switched Telephone Network) for the company’s VoIP (Voice over Internet Protocol) network. Mostly, these solutions are designed for a large number of users and rely on an existing PBX (Private Branch Exchange; Class 5 Switch). For residential and small business environments (hereinafter called “residential environments”), they are usually too expensive. Here VoIP solutions focus on providing telephony services via the house’s broadband access like DSL or similar. Connections to other VoIP users can directly and easily be established using VoIP clients, but for connections to the PSTN a commercial PSTN provider for VoIP services has to be interposed and causes additional fees. Moreover, only few such PSTN providers exist, and in many countries this kind of service is not supported. Furthermore, incoming calls via VoIP may not be handled properly if the user is offline. The “Embedded VoIP Terminal Adapter” (EVITA) is a small and cheap solution for enabling residential environments to make homogenous calls to PSTN and VoIP partners (figure 1). The interface for the PSTN is realized through a direct connection. Therefore, the PSTN access component is plugged directly into the telecommunication connection unit (e.g. ISDN) like a normal phone. For VoIP to PSTN calls the EVITA is a virtual endpoint of the VoIP call. It establishes (via a proper interface; “Subscriber Line Interface”) a communication link to the called partner. For VoIP to VoIP calls EVITA contains a protocol specific “Protocol Handling Facility”. Depending on the level of integration, the terminal adapter can be realized with only a few integrated circuits or even on a single chip. Today, embedded solutions for the “Subscriber Line Interface” already exist and can simply be integrated. Also, the integrated components “VoIP Protocol Handling Facility” and “Media Handler/ Media Mapper” are already available for SIP (Session Initiation Protocol) environments.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 48% of the total text.

Page 1 of 3

S

© SIEMENS AG 2003 file: 2003J07936.doc page: 1

Embedded VoIP Terminal Adapter for Residential Environments (EVITA)

Idea: Thomas Hanna, DE-Paderborn; Klaus-Josef Kunte, DE-Paderborn

In commercial environments many hardware-based gateways exist that provide access to the PSTN (Public Switched Telephone Network) for the company's VoIP (Voice over Internet Protocol) network. Mostly, these solutions are designed for a large number of users and rely on an existing PBX (Private Branch Exchange; Class 5 Switch). For residential and small business environments (hereinafter called "residential environments"), they are usually too expensive. Here VoIP solutions focus on providing telephony services via the house's broadband access like DSL or similar. Connections to other VoIP users can directly and easily be established using VoIP clients, but for connections to the PSTN a commercial PSTN provider for VoIP services has to be interposed and causes additional fees. Moreover, only few such PSTN providers exist, and in many countries this kind of service is not supported. Furthermore, incoming calls via VoIP may not be handled properly if the user is offline.

The "Embedded VoIP Terminal Adapter" (EVITA) is a small and cheap solution for enabling residential environments to make homogenous calls to PSTN and VoIP partners (figure 1). The interface for the PSTN is realized through a direct connection. Therefore, the PSTN access component is plugged directly into the telecommunication connection unit (e.g. ISDN) like a normal phone. For VoIP to PSTN calls the EVITA is a virtual endpoint of the VoIP call. It establishes (via a proper interface; "Subscriber Line Interface") a communication link to the called partner. For VoIP to VoIP calls EVITA contains a protocol specific "Protocol Handling Facility". Depending on the level of integration, the terminal adapter can be realized with only a few integrated circuits or even on a single chip. Today, embedded solutions for the "Subscriber Line Interface" already exist and can simply be integrated. Also, the integrated components "VoIP Protocol Handling Facility" and "Media Handler/ Media Mapper" are already available for SIP (Session Initiation Protocol) environments.

The Embedded VoIP Terminal Adapter consists of the following five components (figure 2):

- The "Network Interface" provides the physical and logical networking link via a messaging interface, which is independent of the used transport technology and transport protocol (e.g. Ethernet, Bluetooth, etc.).

- The "Subscriber Line Interface" (SLI) deals with the PSTN specific access. It is, for example, able to handle ISDN and POTS (Plain Old Telephony System) access.

- The "Configuration Interface" provides information about user access rights, user registration, number mapping, etc.. It is able to map PSTN numbers or MSNs (Multiple Subscriber Numbers) to a specific VoIP device.

- The "VoIP Protocol Handling Facility" is a component that is capa...