CA2276342A1 - Parallel call delivery at several tk network accesses - Google Patents
Parallel call delivery at several tk network accesses Download PDFInfo
- Publication number
- CA2276342A1 CA2276342A1 CA002276342A CA2276342A CA2276342A1 CA 2276342 A1 CA2276342 A1 CA 2276342A1 CA 002276342 A CA002276342 A CA 002276342A CA 2276342 A CA2276342 A CA 2276342A CA 2276342 A1 CA2276342 A1 CA 2276342A1
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- CA
- Canada
- Prior art keywords
- subscriber
- called
- call
- network accesses
- network
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
- H04Q3/0029—Provisions for intelligent networking
- H04Q3/005—Personal communication services, e.g. provisions for portability of subscriber numbers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/42229—Personal communication services, i.e. services related to one subscriber independent of his terminal and/or location
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Telephonic Communication Services (AREA)
Abstract
A method for call delivery to a called subscriber (B) in one or several telecommunications (= TK) networks (1, 2, 3) is characterized in that the called TK
subscriber (B) has several different network accesses (11, 12, 13) that can be reached by the same dial number by a calling TK subscriber (A) and that a call, when this unique dial number is dialed by the calling TK subscriber (A), is forwarded in parallel to several network accesses (11, 12, 13) of the called TK subscriber (B). When the called TK
subscriber (B) accepts the call at one of his network accesses (13), a corresponding return message releases the simultaneously pending call at his other network accesses (11, 12).
Thus, an incoming call can be offered simultaneously to several different TK
network accesses of the called TK subscriber so that no significant time delay occurs due to successive processing of the routing list.
subscriber (B) has several different network accesses (11, 12, 13) that can be reached by the same dial number by a calling TK subscriber (A) and that a call, when this unique dial number is dialed by the calling TK subscriber (A), is forwarded in parallel to several network accesses (11, 12, 13) of the called TK subscriber (B). When the called TK
subscriber (B) accepts the call at one of his network accesses (13), a corresponding return message releases the simultaneously pending call at his other network accesses (11, 12).
Thus, an incoming call can be offered simultaneously to several different TK
network accesses of the called TK subscriber so that no significant time delay occurs due to successive processing of the routing list.
Description
Parallel Call Delivery at Several TK Network Accesses The invention relates to a method for call delivery to a called subscriber in one. or more telecommunications (= TK) networks.
Such a method is disclosed, for example, in US 5,592,541.
Today, due to generally increased mobility, TK subscribers often can no longer be reached primarily or constantly at a single TK terminal. DE 44 40 500 Al therefore proposes a communications system in which call forwarding from a wire-bound to a cordless terminal is automatically activated when a cordless terminal is removed from its associated holder. Particularly in connection with cellular systems, DE 38 43 870 Al provides for a method for call transfer to a mobile station, in which a call is forwarded from a first mobile station, which is not occupied at the time of the call or which does not want to receive a call, to any other mobile station, if the mobile station or a TK subscriber has transmitted the respective dial number and forwarding number of the other mobile station to the cellular gateway.
New techniques furthermore make it possible to "take possession" of terminals, e.g., by means of a chip card, and to use them like one's own connection for a given period. This can have the result that a TK subscriber owns several accesses to different networks at any given instant. DE 37 32 109 Al, for example, proposes a telephone switching system, in which the current location of a TK subscriber is determined by means of a code card and a call for this TK subscriber is forwarded to a terminal near him.
Today, however, TK subscribers frequently own a connection to a cellular network in addition to a connection to one or several fixed networks. Methods for call forwarding between fixed network and cellular network are described, for example in EP 0 A2 or DE 41 40 974 Al . Even with TK networks of the same type (fixed network or cellular network), networks of different operators may differ in the technology used, which may cause problems during access by the same subscriber to different networks in 2 0 the course of call forwarding.
DE 44 30 343 A1 describes a method for calling a telephone subscriber in which a free selection group of telephone lines is defined for a given telephone line. Upon receipt of a call intended for that telephone line, a line of the free selection group is called and a certain response time is allowed. If there is no answer at the respective telephone, the call is to be forwarded to another telephone line of the free selection group until the called TK
subscriber accepts the call at one of the lines. In other words, there is automatic call forwarding in accordance with a predetermined sequence of lines to be dialed within a free selection group.
Finally, the initially cited US 5,592,541 discloses a method in which, based on a list determined in advance by the TK subscriber to be called, incoming calls for his telephone number are successively routed to the other specified telephone numbers until the called TK subscriber accepts the call at one of the TK terminals on the list or the calling subscriber disconnects the call. The routing list for successive call transfer can be defined differently for different times.
All of the above described methods, however, have in common the fact that a called TK
sub 'scriber who owns several accesses to one or several TK networks cannot be simultaneously reached at each of his network accesses. At best, an incoming call is 2 0 forwarded successively to different network accesses. This can result in significant time delays, particularly if the called TK subscriber can be reached at the very last connection of the routing list, while the calling TK subscriber may give up and interrupt the call before reaching the called subscriber.
It is the object of the invention, in contrast, to present a method for call delivery in which an incoming call is simultaneously offered to several different TK network accesses of the called TK subscriber so that no significant time delay occurs due to successive processing of the routing list.
Such a method is disclosed, for example, in US 5,592,541.
Today, due to generally increased mobility, TK subscribers often can no longer be reached primarily or constantly at a single TK terminal. DE 44 40 500 Al therefore proposes a communications system in which call forwarding from a wire-bound to a cordless terminal is automatically activated when a cordless terminal is removed from its associated holder. Particularly in connection with cellular systems, DE 38 43 870 Al provides for a method for call transfer to a mobile station, in which a call is forwarded from a first mobile station, which is not occupied at the time of the call or which does not want to receive a call, to any other mobile station, if the mobile station or a TK subscriber has transmitted the respective dial number and forwarding number of the other mobile station to the cellular gateway.
New techniques furthermore make it possible to "take possession" of terminals, e.g., by means of a chip card, and to use them like one's own connection for a given period. This can have the result that a TK subscriber owns several accesses to different networks at any given instant. DE 37 32 109 Al, for example, proposes a telephone switching system, in which the current location of a TK subscriber is determined by means of a code card and a call for this TK subscriber is forwarded to a terminal near him.
Today, however, TK subscribers frequently own a connection to a cellular network in addition to a connection to one or several fixed networks. Methods for call forwarding between fixed network and cellular network are described, for example in EP 0 A2 or DE 41 40 974 Al . Even with TK networks of the same type (fixed network or cellular network), networks of different operators may differ in the technology used, which may cause problems during access by the same subscriber to different networks in 2 0 the course of call forwarding.
DE 44 30 343 A1 describes a method for calling a telephone subscriber in which a free selection group of telephone lines is defined for a given telephone line. Upon receipt of a call intended for that telephone line, a line of the free selection group is called and a certain response time is allowed. If there is no answer at the respective telephone, the call is to be forwarded to another telephone line of the free selection group until the called TK
subscriber accepts the call at one of the lines. In other words, there is automatic call forwarding in accordance with a predetermined sequence of lines to be dialed within a free selection group.
Finally, the initially cited US 5,592,541 discloses a method in which, based on a list determined in advance by the TK subscriber to be called, incoming calls for his telephone number are successively routed to the other specified telephone numbers until the called TK subscriber accepts the call at one of the TK terminals on the list or the calling subscriber disconnects the call. The routing list for successive call transfer can be defined differently for different times.
All of the above described methods, however, have in common the fact that a called TK
sub 'scriber who owns several accesses to one or several TK networks cannot be simultaneously reached at each of his network accesses. At best, an incoming call is 2 0 forwarded successively to different network accesses. This can result in significant time delays, particularly if the called TK subscriber can be reached at the very last connection of the routing list, while the calling TK subscriber may give up and interrupt the call before reaching the called subscriber.
It is the object of the invention, in contrast, to present a method for call delivery in which an incoming call is simultaneously offered to several different TK network accesses of the called TK subscriber so that no significant time delay occurs due to successive processing of the routing list.
According to the invention, this object is attained in a manner that is as surprisingly simple as it is effective. The called TK subscriber has several different network accesses, which a calling TK subscriber can reach by dialing the same dial number. When a subscriber dials this unique dial number, the call is forwarded in parallel to several network accesses of the called TK subscriber.
his significantly improves the reachability of the called TK subscriber since simultaneous call delivery makes it possible to reach him at any given~instant at all of his network accesses. Compared to successive processing of a predetermined routing list, the call arrives much faster at the called destination subscriber.
In a particularly preferred variant of the method according to the invention, as the called TK subscriber accepts the call at one of his network accesses, the simultaneously pending call at his other network accesses is released by a corresponding acknowledgment. This frees the lines to the remaining network accesses.
A further preferred variant of the method provides that the called TK
subscriber can select a group from among all of his network accesses to which the call is to be delivered in parallel when a calling TK subscriber dials a unique dial number. Thus, the destination subscriber can limit his reachability via a specific unique dial number at all of his network accesses to a selected group as a function of criteria that he himself determines.
This group could also be selected differently for different times, e.g., daytime or nighttime or working days and holidays.
The method according to the invention can be used with particular advantage if the called TK subscriber is a service provider and a specific group supporting the corresponding service is automatically selected for parallel call delivery from among all of the network accesses of the called TK subscriber as a function of the service offered.
Advantageously, the parallel call delivery according to the inventive method can be a service feature of an IN (= Intelligent Network) service, which is offered to the network subscribers either by a network operator or by a service provider active within the network.
In an advantageous further development of this variant of the method, the service feature "parallel call delivery" is activated when the ordinary dial number of the called TK
2 0 subscriber is dialed. Thus, to set up a connection with the called destination subscriber, the calling TK subscribers need only to memorize this ordinary dial number or get it from directory assistance or look it up in the phone book.
Alternatively, the service feature "parallel call delivery" can be activated when a composite number is dialed consisting of ari additional service identifier and the ordinary dial number of the called TK subscriber. This makes it possible for the calling subscriber himself to choose between the option "call delivery at a specific network access" and "parallel call delivery." For the service feature "parallel call delivery,"
additional charges may then accrue for the calling subscriber.
The inventive method is particularly advantageous if the TK networks to which the called TK subscriber has access comprise technically different TK networks, particularly fixed networks and cellular networks. The reachability of the called destination subscriber is then significantly improved also across different TK networks and different network technologies.
The inventive method is advantageously designed such that a call from a calling TK
subscriber to the called TK subscriber is initially set up via a first "setup message" up to a point in the TK network, preferably an exchange, where the information required for parallel branching of the call to the different network accesses of the called TK subscriber ~is available or can be requested. From there the call is forwarded in parallel via an additional "setup message" - even across TK networks of different operators and different network technologies - to the network accesses of the called TK
subscriber.
Finally, in a further preferred variant of the method, the call can be set up according to the "call drop back" method and, in particular, a parallel call can be returned to an exchange that was passed previously to optimize the call setup tree.
Additional advantages of the invention will become evident from the description and the drawing. Furthermore, the features described above and those set forth below can be used separately by themselves or several together in any combination. The embodiments shown and described are not to be construed as a final enumeration, but are exemplary in nature and are merely used to explain the invention.
The invention is illustrated in the drawing and will be explained in further detail by means of an exemplary embodiment. In the drawing Figure 1 shows a schematic representation of an exemplary network configuration for implementing the inventive method.
Figure 2a shows one possible variant of the inventive connection setup in a network configuration according to Figure 1.
Figure 2b shows the release of the calls pending at the remaining network accesses upon acceptance of the call at one network access following parallel call delivery according to Figure 2a.
Figure 1 shows an exemplary configuration in which a called subscriber B has a network access to a fixed network 1 of an operator I via a terminal 11, to a fixed network 2 of an 2 0 operator II via a terminal 12, and to a cellular network 3 of an operator III by means of a cellular telephone 13. Fixed network 1 is connected, respectively, with fixed network 2 and with cellular network 3 by a signaling network, e.g., via a #7 line.
Another TK
subscriber A who in the example shown has an access to fixed network 1 tries to set up a communications connection with TK subscriber B via his TK terminal 10.
The further sequence of the connection setup according to the inventive method for parallel call transfer is depicted in Figure 2a. The service feature "parallel call delivery"
can be either set permanently for called TK subscriber B, whereby his "normal" dial number should then be generally used, or calling TK
subscriber A can dial him specifically by using a service identifier.
The call is set up via a first "setup message" setup 1 up to a point in the fixed network 1 at which the information required for call branching to the different network accesses of the called TK subscriber B is available or can at least be requested. As a rule, this will be an exchange LE or another network node. From there, the call is forwarded to the various network accesses of the called TK subscriber B, even across networks of various other operators and different technologies, by means of an additional setup message setup 2.
However, TK subscriber B can also limit parallel call delivery to only a specific group of his network accesses. Particularly in the case where the called TK subscriber B is a service provider, this service provider could limit parallel call delivery to those terminals that actually support the service, which is to be requested by the dial number dialed by the calling TK subscriber A. This decision can be made either automatically in the network or at the terminal of the called TK subscriber B.
In particular, the inventive parallel call delivery can be a service feature of an IN (_ Intelligent Network) service and can comprise the above described options if corresponding service parameters are set.
If the called TK subscriber B has accepted the call at one of the existing or selected network accesses, this is messaged back to the unit that initiated the "parallel call delivery" as depicted in Fig. 2b by means of the corresponding message "connect." In the example shown, this is an exchange LE in fixed network 1.
From there, the parallel pending calls to the other network accesses at which the called TK subscriber B is not currently located, terminals 1 l and 12 in the example shown, are released by means of a release message.
l0 To optimize the call setup tree, the call drop back method can be used to return a call to a network access being addressed back to exchanges LE, which were passed previously for a first time during call setup.
his significantly improves the reachability of the called TK subscriber since simultaneous call delivery makes it possible to reach him at any given~instant at all of his network accesses. Compared to successive processing of a predetermined routing list, the call arrives much faster at the called destination subscriber.
In a particularly preferred variant of the method according to the invention, as the called TK subscriber accepts the call at one of his network accesses, the simultaneously pending call at his other network accesses is released by a corresponding acknowledgment. This frees the lines to the remaining network accesses.
A further preferred variant of the method provides that the called TK
subscriber can select a group from among all of his network accesses to which the call is to be delivered in parallel when a calling TK subscriber dials a unique dial number. Thus, the destination subscriber can limit his reachability via a specific unique dial number at all of his network accesses to a selected group as a function of criteria that he himself determines.
This group could also be selected differently for different times, e.g., daytime or nighttime or working days and holidays.
The method according to the invention can be used with particular advantage if the called TK subscriber is a service provider and a specific group supporting the corresponding service is automatically selected for parallel call delivery from among all of the network accesses of the called TK subscriber as a function of the service offered.
Advantageously, the parallel call delivery according to the inventive method can be a service feature of an IN (= Intelligent Network) service, which is offered to the network subscribers either by a network operator or by a service provider active within the network.
In an advantageous further development of this variant of the method, the service feature "parallel call delivery" is activated when the ordinary dial number of the called TK
2 0 subscriber is dialed. Thus, to set up a connection with the called destination subscriber, the calling TK subscribers need only to memorize this ordinary dial number or get it from directory assistance or look it up in the phone book.
Alternatively, the service feature "parallel call delivery" can be activated when a composite number is dialed consisting of ari additional service identifier and the ordinary dial number of the called TK subscriber. This makes it possible for the calling subscriber himself to choose between the option "call delivery at a specific network access" and "parallel call delivery." For the service feature "parallel call delivery,"
additional charges may then accrue for the calling subscriber.
The inventive method is particularly advantageous if the TK networks to which the called TK subscriber has access comprise technically different TK networks, particularly fixed networks and cellular networks. The reachability of the called destination subscriber is then significantly improved also across different TK networks and different network technologies.
The inventive method is advantageously designed such that a call from a calling TK
subscriber to the called TK subscriber is initially set up via a first "setup message" up to a point in the TK network, preferably an exchange, where the information required for parallel branching of the call to the different network accesses of the called TK subscriber ~is available or can be requested. From there the call is forwarded in parallel via an additional "setup message" - even across TK networks of different operators and different network technologies - to the network accesses of the called TK
subscriber.
Finally, in a further preferred variant of the method, the call can be set up according to the "call drop back" method and, in particular, a parallel call can be returned to an exchange that was passed previously to optimize the call setup tree.
Additional advantages of the invention will become evident from the description and the drawing. Furthermore, the features described above and those set forth below can be used separately by themselves or several together in any combination. The embodiments shown and described are not to be construed as a final enumeration, but are exemplary in nature and are merely used to explain the invention.
The invention is illustrated in the drawing and will be explained in further detail by means of an exemplary embodiment. In the drawing Figure 1 shows a schematic representation of an exemplary network configuration for implementing the inventive method.
Figure 2a shows one possible variant of the inventive connection setup in a network configuration according to Figure 1.
Figure 2b shows the release of the calls pending at the remaining network accesses upon acceptance of the call at one network access following parallel call delivery according to Figure 2a.
Figure 1 shows an exemplary configuration in which a called subscriber B has a network access to a fixed network 1 of an operator I via a terminal 11, to a fixed network 2 of an 2 0 operator II via a terminal 12, and to a cellular network 3 of an operator III by means of a cellular telephone 13. Fixed network 1 is connected, respectively, with fixed network 2 and with cellular network 3 by a signaling network, e.g., via a #7 line.
Another TK
subscriber A who in the example shown has an access to fixed network 1 tries to set up a communications connection with TK subscriber B via his TK terminal 10.
The further sequence of the connection setup according to the inventive method for parallel call transfer is depicted in Figure 2a. The service feature "parallel call delivery"
can be either set permanently for called TK subscriber B, whereby his "normal" dial number should then be generally used, or calling TK
subscriber A can dial him specifically by using a service identifier.
The call is set up via a first "setup message" setup 1 up to a point in the fixed network 1 at which the information required for call branching to the different network accesses of the called TK subscriber B is available or can at least be requested. As a rule, this will be an exchange LE or another network node. From there, the call is forwarded to the various network accesses of the called TK subscriber B, even across networks of various other operators and different technologies, by means of an additional setup message setup 2.
However, TK subscriber B can also limit parallel call delivery to only a specific group of his network accesses. Particularly in the case where the called TK subscriber B is a service provider, this service provider could limit parallel call delivery to those terminals that actually support the service, which is to be requested by the dial number dialed by the calling TK subscriber A. This decision can be made either automatically in the network or at the terminal of the called TK subscriber B.
In particular, the inventive parallel call delivery can be a service feature of an IN (_ Intelligent Network) service and can comprise the above described options if corresponding service parameters are set.
If the called TK subscriber B has accepted the call at one of the existing or selected network accesses, this is messaged back to the unit that initiated the "parallel call delivery" as depicted in Fig. 2b by means of the corresponding message "connect." In the example shown, this is an exchange LE in fixed network 1.
From there, the parallel pending calls to the other network accesses at which the called TK subscriber B is not currently located, terminals 1 l and 12 in the example shown, are released by means of a release message.
l0 To optimize the call setup tree, the call drop back method can be used to return a call to a network access being addressed back to exchanges LE, which were passed previously for a first time during call setup.
Claims (10)
1. Method for call delivery to a called subscriber (B) in one or several telecommunications (= TK) networks (1, 2, 3) characterized in that the called TK subscriber (B) has several different network accesses (11, 12, 13) that can be reached by the same dial number by a calling TK subscriber (A) and that a call, when this unique dial number is dialed by the calling TK subscriber (A), is forwarded in parallel to several network accesses (11, 12, 13) of the called TK
subscriber (B).
subscriber (B).
2. Method according to Claim 1 characterized in that when the call is accepted by the called TK subscriber (B) at one of his network accesses (13), a corresponding acknowledgment releases the simultaneously pending call at his other network accesses (11, 12).
3. Method according to one of the preceding claims characterized in that the called TK
subscriber (B) can select a group from among all of his network accesses (11, 12, 13) to which the parallel call delivery is to be made when a unique dial number is dialed by a calling TK subscriber (A).
subscriber (B) can select a group from among all of his network accesses (11, 12, 13) to which the parallel call delivery is to be made when a unique dial number is dialed by a calling TK subscriber (A).
4. Method according to one of the preceding claims characterized in that the called TK
subscriber (B) is a service provider and that, as a function of the offered service, a specific group supporting the corresponding service is automatically selected for parallel call delivery from among all of the network accesses (11, 12, 13) of the called TK subscriber (B).
subscriber (B) is a service provider and that, as a function of the offered service, a specific group supporting the corresponding service is automatically selected for parallel call delivery from among all of the network accesses (11, 12, 13) of the called TK subscriber (B).
5. Method according to one of the preceding claims characterized in that the parallel call delivery is a service feature of an IN (= Intelligent Network) service.
6. Method according to Claim 5 characterized in that the service feature "parallel call delivery" is activated when the ordinary dial number of the called TK
subscriber (B) is dialed.
subscriber (B) is dialed.
7. Method according to Claim 5 characterized in that the service feature "parallel call delivery" is activated when a composite dial number consisting of the ordinary dial number of the called TK subscriber (B) and an additional service identifier is dialed.
8. Method according to one of the preceding claims characterized in that the TK
networks (1, 2, 3) to which the called TK subscriber (B) has access comprise technically different TK networks, particularly fixed networks (1, 2) and cellular networks (3).
networks (1, 2, 3) to which the called TK subscriber (B) has access comprise technically different TK networks, particularly fixed networks (1, 2) and cellular networks (3).
9. Method according to one of the preceding claims characterized in that a call from a calling TK subscriber (A) to the called TK subscriber (B) is initially set up via a first "setup message" (setup 1) up to a point in the TK network (1), preferably an exchange (LE), where the information required for parallel call branching to the different network accesses (11, 12, 13) of the called TK subscriber (B) is available or can be requested, and that from there the call is forwarded in parallel via an additional "setup message" (setup 2) - even across TK networks (2, 3) of different operators and different network technologies - to the network accesses (11, 12, 13) of the called TK subscriber (B).
10. Method according to one of the preceding claims characterized in that the call is set up according to the "call drop back" method and, in particular, a parallel call can be returned to an exchange (LE) that was passed previously.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19829342.9 | 1998-07-01 | ||
| DE19829342A DE19829342A1 (en) | 1998-07-01 | 1998-07-01 | Parallel call delivery on several TK network accesses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2276342A1 true CA2276342A1 (en) | 2000-01-01 |
Family
ID=7872595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002276342A Abandoned CA2276342A1 (en) | 1998-07-01 | 1999-06-25 | Parallel call delivery at several tk network accesses |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0969646A1 (en) |
| JP (1) | JP2000069176A (en) |
| AU (1) | AU3690599A (en) |
| CA (1) | CA2276342A1 (en) |
| DE (1) | DE19829342A1 (en) |
| SG (1) | SG90055A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1333296C (en) * | 1988-11-15 | 1994-11-29 | Dawn Smith | Group emergency call system |
| DE4102796A1 (en) * | 1991-01-31 | 1992-08-06 | Thomson Brandt Gmbh | METHOD FOR REDUCING ACCESS TIME |
| US5206901A (en) * | 1991-12-23 | 1993-04-27 | At&T Bell Laboratories | Method and apparatus for alerting multiple telephones for an incoming call |
| US5475748A (en) * | 1992-09-18 | 1995-12-12 | Boston Technology, Inc. | Automatic telephone system with function for multiple out-dialed calls per caller |
| CA2088420C (en) * | 1993-01-29 | 1996-10-08 | Deborah L. Pinard | Method of establishing communication link to one of multiple devices associated with single telephone number |
| US5724411A (en) * | 1995-03-22 | 1998-03-03 | At&T Corp. | Method for selectively alerting multiple telephones of an incoming call |
| US5802160A (en) * | 1996-01-19 | 1998-09-01 | Pilgrim Telephone, Inc. | Multi-ring telephone method and system |
| US6405041B1 (en) * | 1996-06-27 | 2002-06-11 | At&T Wireless Services, Inc. | Concurrent ringing on multiple network telephones |
-
1998
- 1998-07-01 DE DE19829342A patent/DE19829342A1/en not_active Withdrawn
-
1999
- 1999-06-17 JP JP11170463A patent/JP2000069176A/en active Pending
- 1999-06-18 EP EP99440151A patent/EP0969646A1/en not_active Withdrawn
- 1999-06-23 SG SG9903124A patent/SG90055A1/en unknown
- 1999-06-25 CA CA002276342A patent/CA2276342A1/en not_active Abandoned
- 1999-06-30 AU AU36905/99A patent/AU3690599A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000069176A (en) | 2000-03-03 |
| AU3690599A (en) | 2000-01-20 |
| SG90055A1 (en) | 2002-07-23 |
| EP0969646A1 (en) | 2000-01-05 |
| DE19829342A1 (en) | 2000-01-05 |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |