Open Architecture for Service enabled "Thin" Telephony Clients
Original Publication Date: 2002-Sep-01
Included in the Prior Art Database: 2003-Jul-23
Today there is no solution for telephony architecture which allows the new multimedia transport and signaling techniques the use of individual terminals without the loss of existing telephony features that are still provided by installed PBX (Private Branch Exchange) and moreover that is open enough to allow the gradual addition of new features, services and applications in a true, network-independent way. The new telephony service architecture resolves these restrictions by introducing an open service control plane, uncoupled from the basic call control and media planes. Furthermore this solution allows the full use of PBX functionality towards old and new terminal types.
Open Architecture for Service e-nabled "Thin" Telephony Clients
Information / Kommunikation
Idee: Marc Roelands, BE–Herentals
Today there is no solution for telephony architecturewhich allows the� new� multimedia� transport� andsignaling techniques the use of individual terminalswithout the loss of existing telephony features thatare still provided by installed PBX (Private BranchExchange)� and� moreover� that� is open enough toallow the gradual addition of new features, servicesand applications in a true, network-independent way.
The new� telephony� service� architecture� resolvesthese restrictions by� introducing� an� open� servicecontrol plane, uncoupled from the basic call controland media planes. Furthermore this solution allowsthe full use of PBX functionality towards old andnew terminal types.
Figure 1 shows the different architectural elementsand their relations. Crucial to the architecture is thatonly the elements A, B and F are service-aware. Atthe other communication end it is actually the termi-nal user� that� is� aware� of� services.� New� service-providing elements like B or F can be added to thearchitecture without imposing any changes to any ofthe elements C, D or E. This is made possible bydecoupling the services themselves, i.e. the “servicecontent”, from the service transport mechanism. Tothis� extend� a� technical� solution is invented thatmakes it possible to use the World Wide Web para-digm for the transport of services such as telephonyfeatures, while until now this paradigm is only ap-plied in the narrower� scope� of� computer� systemsinterconnected by a data network.
The first inventive step is� on� the� side� of� terminalsystem (D) and its communication (1) to the servicepresentation server (C). The fact that anything dis-played on a device used for telephony can be de-scribed as just a page of some “hypertext” type hasled to the idea, that the device display use for teleph-ony� feature-related� functionality� can� be� realizedaltogether with Web applications that are controlledfrom some of these devices already today. This op-poses to the usual approach for triggering and show-ing telephony feature progress by using a part of thedevice display for content dictated by locally hard-wired phone logic. Such phone logic typically allowsselection in a feature progress-dependent menu thatis fetched from the PBX through a proprietary or atleast� a� telephony-specific� protocol,� often� of� the“stimulus” type, closely tied to basic call signaling.
Examples of display description standards that can beused� for� the� new� approach� are HTML (HypertextMark-up Language) pages or WML (Wireless Mark-up Language) card decks, the latter being orientedexactly to the broad variety of smaller displays. This
display content can be transported by the standardtransport� protocol� that� is� usually� associated� withthese respective content description standards, HTTP(Hypertext� Transport� Protocol)� or WSP (WirelessSession� P...