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PDA / OptiPhone-based Decomposed Communication Unit

IP.com Disclosure Number: IPCOM000020764D
Published in the IP.com Journal: Volume 4 Issue 1 (2004-01-25)
Included in the Prior Art Database: 2004-Jan-25
Document File: 3 page(s) / 58K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Today, IP phone implementations use proprietary phone hardware running a VoIP (Voice over Internet Protocol) enabled phone SW. Although a stimulus protocol is used to control the phone, which allows to use a cheaper phone hardware in the TDM (Time Division Multiplexing) world, this advantage of stimulus protocols compared to functional protocols is no longer valid for VoIP. This is because of the additional requirements of IP telephony, like the usage of a H.323 stack for payload establishment, QoS (Quality of Service) reporting, SW deployment etc. Therefore, VoIP phones require a phone hardware with a powerful CPU (Central Processing Unit) and sufficient memory space, which makes the phone hardware significantly more expensive. So far phones are built as an all in one solution. At most there is an adaptor concept, which allows the user to add special extensions to the phone like dial key modules, analogue adaptors, display modules etc. The phone itself is not designed in a modular way. Therefore, it is proposed to separate the controlling unit (CPU, Memory) of a phone from its Input/Output devices (Keys, LEDs, Hook, Speaker, Microphone etc.). For the controlling unit, an off-the-shelf PDA (Personal Digital Assistant) running a standard Operating System (OS) can be used. The existing phone SW or a PC-based phone client is ported to the PDA. The "reduced" phone hardware with the I/O devices is used as a docking station for the PDA. The PDA controls the phone using a stimulus protocol that allows to build a cheap "phone docking station". The PDA and the "phone docking station" together constitute the IP phone, the "optiPDA" (Figure 1,2).

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© SIEMENS AG 2003 file: 2003J17819.doc page: 1

PDA / OptiPhone-based Decomposed Communication Unit

Idea: Rainer Zimmermann, DE-Paderborn; Bruno Bozionek, DE-Paderborn;

Dieter Hemkemeyer, DE-Paderborn

Today, IP phone implementations use proprietary phone hardware running a VoIP (Voice over Internet Protocol) enabled phone SW. Although a stimulus protocol is used to control the phone, which allows to use a cheaper phone hardware in the TDM (Time Division Multiplexing) world, this advantage of stimulus protocols compared to functional protocols is no longer valid for VoIP. This is because of the additional requirements of IP telephony, like the usage of a H.323 stack for payload establishment, QoS (Quality of Service) reporting, SW deployment etc. Therefore, VoIP phones require a phone hardware with a powerful CPU (Central Processing Unit) and sufficient memory space, which makes the phone hardware significantly more expensive. So far phones are built as an all in one solution. At most there is an adaptor concept, which allows the user to add special extensions to the phone like dial key modules, analogue adaptors, display modules etc. The phone itself is not designed in a modular way.

Therefore, it is proposed to separate the controlling unit (CPU, Memory) of a phone from its Input/Output devices (Keys, LEDs, Hook, Speaker, Microphone etc.). For the controlling unit, an off- the-shelf PDA (Personal Digital Assistant) running a standard Operating System (OS) can be used. The existing phone SW or a PC-based phone client is ported to the PDA. The "reduced" phone hardware with the I/O devices is used as a docking station for the PDA. The PDA controls the phone using a stimulus protocol that allows to build a cheap "phone docking station". The PDA and the "phone docking station" together constitute the IP phone, the "optiPDA" (Figure 1,2).

By using an off-the-shelf PDA with a standard OS, widespread applications like Outlook Pocket, various internet browser, MS Messenger or LDAP (Lightweight Directory Access Protocol) Access can be used on the optiPDA. The separation of controlling unit and I/O devices allows for a higher mobility, since the user can place the PDA in different "phone docking stations" and still has his personal phone available (e.g. shared desk scenario). Also, closer coupling of the user's office equipment is possible. For instance, if the PDA has a touch screen display this can be used in conjunction with the phone. Together with additional adaptor cards, like a GSM card, the PDA can be used as the central communication device of the user.

The ab...