Key telephone system with cordless terminals

Translation of description of equivalent WO 9812861 A2

Key phone system with cordless Endgeraten

The invention voriiegende betπfft a key telephone system with cordless Endgeraten according to the preamble of claim 1

In addition to simple telephone sets that are connected to a single connecting line, there are terminals that with a speech circuit via an additional control panel access to multiple lines have through appropriate interconnection of several such special terminals create systems that eg as Vorzimmer-, Key, series or broker systems are referred to in F Ohmann, communications Endgerate. Spπnger- HIDE, Berlin 1983. Chapter 4 2 7 Pages 187-193 are beschnebeπ three major examples of such facilities

hierarchical group, working group with team structure and - central answering point as the representative for absent clerk

Of particular importance are brokers and application systems, in which each member of a workgroup representing each additional team member with respect to external calls and the conversations can take given several common Wählleitungeπ be done at several terminals External calls are therefore signaled simultaneously on multiple devices, so that different Teammitgiieder may occur on an incoming call

As is known, allow for example to DECT or GSM standards working Cordless telephone systems the subscriber, his conversations regardless of his place of work to lead EP 0533510 A2 is a cordless phone system with key functionality beschneben whose Cordless Telephones function keys first and indicators have, which are each associated with a dial-up line furthermore has a memory provided, including information with respect to the cordless phone assigned dialup the known Cordless key telephone system has the essential performance features Mate known key telephone system on When receiving a call signal checks the Cordless phone, therefore, whether the ring signal supplied Honge line is assigned to the respective cordless telephone If this zutπfft, the call is indicated by the indicator, after which the subscriber can accept by pressing the corresponding key the call

Therefore, the known cordless key telephone system includes special cordless phones, who needed a to-satzliche keyboard, an additional storage area and a corresponding Betnebssoftware and therefore are verhaltnismässig expensive conventional cordless phones without key functions na did, however, are not usable Probable for the subscriber option for selectively entering calls from various lines of contrast geπngerer meaning The present invention is therefore an object to provide a key telephone system, in which even conventional cordless phones can be integrated, which have no special key panel and line indicators.

This object is achieved by the features specified in claim 1 measures. Advantageous embodiments of the invention are indicated in further claims.

The inventive Cordless key telephone system deafened the use of conventional the cordless phones that can be integrated into the key telephone system as the stationary key terminals.

The invention is explained for example with reference to a drawing. In which:

Fig. 1 is a erfϊndungsgemässes Key telephone system,

FIG. 2, the key telephone system according to FIG. 1 supplemented by GSM and Endgerätedf

Fig. 3 more a Keyanlage associated mobile and stationary terminals.

FIG. 1 shows a private branch exchange VST with a connected via a Schπittstellenbaugruppe SB as the public network switching unit SWU, the calls over subscriber line interface (Subscriber Line Module) or server modules SLMO (Key System server), SLMC (Cordless server) and SLMG (the extension to the server module SLMG (GSM server) is shown in FIG. 2) to stationary and mobile devices TSa. TSb, TSc, TSd; MTC, MTG switches through. The mobile terminals MTC and MTG (shown in Fig. 2) are koπtaktiert via radio or base stations BSC1, BSC2 or BSG, which are connected to the server modules SLMC or SLMG. The Key System server SLMO required for the Key functionality features are provided in a known manner.

The coupling of GSM terminals to the base stations BSG and any necessary zone change effected by known processes, for example in PR Gerke, Digital Communication Networks, Springer Verlag, Heidelberg, 1991, section 6.7 are described. See also the recommendations of the CEPT (Conference of Europ Administrations des Postes et Telέcommunications.) - Group GSM (Groupe Speciale Mobile).

The cordless terminals MTC preferably operate according to the DECT standard (DECT: Digital European Cordless pean telecom unication, European Standard (ETS) for schnurtose telephony DECT operates in the frequency range up to 1900 MHz with a combined Zugriffrsverfahren from Frequenzmul- tiplexverfahren by 10. carrier signals (FDMA) and Zeitmuitiplexverfahren with 24 time slots (TDMA). BVei a connection capacity of 120 channels, a maximum of 12 simultaneous duplex connections with 32 kbit / s (net) are available. The maximum range in buildings is limited to 200m). The DECT standard is among others described in R. Gerke, ibid, page 311th For the present invention may be used by the DECT and according to the GSM standard, and by any other method working mobile devices

According to F Ohmann, cited above, page 193 are painting the Keyanlagen offered today in their performance feature and construction stages largely on the conditions of the international market influenced you have there with attendance of up to 100, the spread on the star test form of PBXs for small Keyanlagen (up ca 20 participants and up to 6 dial-up lines) each participant has targeted access to all dial-up lines (squared system) Bigger Keyanlagen (up to approx 100 people and up to 24 dial-up lines) are designed such that the individual microphone units laid down only for targeted th lines access have (non squared system)

In Figures 1 and 2 the Key System server SLMO Ib are supplied with the phone numbers -4566, 4512, 4700 and 4028 include the lines, of which the key system server SLMO via lines with the numbers 4666 and 4512 with the Key terminal equip- TSa and TSb, is connected via lines with the numbers 4666, 4700, 4028 and 4512 with the key terminal TS c and lines with the numbers 4028 and 4512 with the key terminal TSd (each number is represented by a different line ) the assignment of the lines to the Key terminals is done in each case according to the needs of the participants, who often work in a team, the team members that can selectively access the lines assigned to them on their stationary key terminals often include cordless phones, at any time to be reached for Vertassen the office previously call forwarding from the fixed to the mobile terminal has been made (or there is a system in accordance with EP 0533510 A2 used) In Fig 1 it is evident that the participants on the call number 4666 calls its mobile cordless terminal device MTC has diverted with the number 5001 Due to the automatic call forwarding, the remaining team members can no longer access the on line with the phone number 4666 incoming calls occur If the participant who has call forwarding activated, his mobile cordless terminal device MTC has not within reach, the calls are not answered on telephone number 4666

Erfiπdungsgernäss are therefore all required by the participants leads also to the cordless server SLMC or to the GSM server SLMG switched through, by a mobile terminal MTC or MTG is called as soon as one of the respective mobile Eπdgerät MTC or MTG associated lines eintπfft a call In Figure 1 is shown to the participants or to the stationary Key terminal TSa TSc or via mobile cordless terminals MTCA MTCC grout, where the same lines (numbers 4666, 4512 or 4666, 4512, 4700, 4028) are assigned as the zugehön- gene stationary key terminal TSa and TSc through the Cordless server SLMC the lines to the mobile cordless terminal th MTC be the arrival of a call is switched through this purpose, the Cordless server SLMC (or the GSM servers SLMG) a memory unit LM to, in the mobile or cordless Endgeraten MTCA MTCC numbers assigned are stored an incoming call is detected on the basis of data stored in the memory unit LM, which mobile Cordless terminals MTC to mediating line is assigned. After the line is to be established in the connected through the Cordless server SLMC (or the GSM server SLMG) provided switching unit SWU-C. In Fig. 1 is illustrated, for example, that the line with the number 4512 (dotted line) to all fixed and mobile terminals TS or MTC is turned on.

In the memory unit LM is preferably still determine which lines are assigned to the mobile terminals MTCA or MTCC for outgoing calls priority.

According to the DECT standard operating mobile terminal MTC allow the indication of the called number on the display (eg an LCD display) of the device. This allows the user of the mobile terminal MTC recognizes each which line he is called and can selectively enter the calls. A control panel with an additional display for example by means of LEDs is therefore practically not necessary. For example, if the number is 4666 created, so a call signal will advise both the stationary key Endge- TSa and TS c, as well as on the mobile cordless Endgeraten MTCA and MTCC issued. On the stationary key terminals TSa and TS c indication of the called number for example, by a light emitting diode. however, the number 4666. The appears these terminals TSa, MTCA and TS c on the display of the cordless terminals MTCA and MTCC. MTCC associated subscriber can therefore, regardless of whether they are in the office or on the road, calls to numbers 4666 and 4512 übemehmen (the participant with the terminals and TS c MTCC may additionally calls übemehmen the numbers 4700 and 4028). This has the advantage that both the absent subscribers, as well as the other team members, including the secretary, calls can übemehmen to the absent subscriber numbers assigned.

Preferably, the mobile terminals MTC, MTG are fed only the lines required by the operator in question regularly. For example, only the number of personal stationary Key Endgerates TS as well as the number of a partner switched through, which is responsible for the same subject area. An access to the lines of all team members via a mobile terminal MTC, MTG is not necessary under certain circumstances. The participant with the terminals and TS c MTCC can for example access via the stationary terminal TSc on the lines with the numbers 4666. 4512, 4700 and 4028 and on the mobile terminal MTC and / or MTG as only the lines with the numbers 4700 and 4028 ,

In particular, if a display of the called number is not possible, preferably mobile terminals MTC and / or MTG be used which are suitable for delivery of different ringing signals, so that one or more be through conduits in the cordless and / or GSM in the server, a separate ring tone can be assigned. Thus, the subscriber can determine which line he is called. A process for producing any Rufsignalrythmen in the PABX location VST or therein servers SLMO, SLMC, SLMG are known to the expert, for example from CH-PS 624 808.

As shown in Fig. 3, absent team members remain involved in the key system in the absence from their mobile devices MTC and / or MTG.