WO2002089495A2 - Interworking of b-side subscriber features for subscribers in a telecommunication on network - Google Patents

Interworking of b-side subscriber features for subscribers in a telecommunication on network Download PDF

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Publication number
WO2002089495A2
WO2002089495A2 PCT/EP2002/004261 EP0204261W WO02089495A2 WO 2002089495 A2 WO2002089495 A2 WO 2002089495A2 EP 0204261 W EP0204261 W EP 0204261W WO 02089495 A2 WO02089495 A2 WO 02089495A2
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WO
WIPO (PCT)
Prior art keywords
subscriber
call
service feature
busy
ccbs
Prior art date
Application number
PCT/EP2002/004261
Other languages
French (fr)
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WO2002089495A3 (en
Inventor
Nikas Panagiotis
Original Assignee
Siemens Aktiengesellschaft
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Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP02724289A priority Critical patent/EP1382189A2/en
Publication of WO2002089495A2 publication Critical patent/WO2002089495A2/en
Publication of WO2002089495A3 publication Critical patent/WO2002089495A3/en

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Classifications

    • 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
    • H04M3/428—Arrangements for placing incoming calls on hold
    • 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
    • H04M3/42127—Systems providing several special services or facilities from groups H04M3/42008 - H04M3/58
    • 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
    • H04M3/42136—Administration or customisation of services
    • H04M3/4217—Managing service interactions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0435—Details
    • H04Q11/0457—Connection protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2207/00—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place
    • H04M2207/08—ISDN systems
    • 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
    • H04M3/46—Arrangements for calling a number of substations in a predetermined sequence until an answer is obtained
    • 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
    • H04M3/50—Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers ; Centralised arrangements for recording messages
    • H04M3/53—Centralised arrangements for recording incoming messages, i.e. mailbox systems
    • H04M3/533—Voice mail systems
    • H04M3/53366—Message disposing or creating aspects
    • 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
    • H04M3/54—Arrangements for diverting calls for one subscriber to another predetermined subscriber
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13152—Callback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13173—Busy signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13196—Connection circuit/link/trunk/junction, bridge, router, gateway
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13204—Protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13282—Call forward, follow-me, call diversion

Definitions

  • the present invention relates to telecommunication systems and more particular to service features for subscribers.
  • Such feature services are e.g. commonly used in Integrated Services Digital Networks (ISDN) .
  • ISDN Integrated Services Digital Networks
  • the following description refers to the case that the invention is used within an ISDN telecommunication system.
  • the present invention relates to any telecommunication network system showing features corresponding to ISDN features as far as relevant with respect to the present invention.
  • a service feature called 'Call Waiting' (CW) in the following, which uses a signal to alert a B-subscriber having an active line that a call request is made to that subscriber.
  • the B-subscriber has in principle three possibilities to respond thereto: He may accept, reject or ignore the waiting call.
  • the B-subscriber has the possibility to accept the waiting call within a certain, predetermined time interval. To realise the acceptation, the B-subscriber either has to hold or quit his original connection.
  • a muted ring or an optical sign on a screen can be used as the signal.
  • DIVBY in the following, which routs a call initiated by an A-subscriber destined to a B-subscriber forward to a C-subscriber in case the B-subscriber line is busy (occupied) and provided that the B-subscriber has activated this service feature and indicated the C- subscriber as destination for the call diversion.
  • DIVDA 'Call Diversion On No Answer'
  • a service feature called 'Call Completion To Busy Subscriber' (CCBS) in the following, which operates as follows: If an A-subscriber calls a B-subscriber while the B-subscriber line is busy, then the A-subscriber has the possibility to request for a re-call. If the request is accepted, the A-subscriber will be notified (e.g. by a call) as soon as the B-subscriber line becomes available and subsequently the A- and the B-subscriber can get connected. Prerequisite for that is that the A-subscriber has the authorisation for this service.
  • CCBS 'Call Completion To Busy Subscriber'
  • a line has two basic channels, usually called B-channels or B speech channels (besides a signal channel, usually called D-channel or D signalling channel) and in this case a 'busy line' means that both speech channels of a subscriber line are active
  • the A-subscriber having the authorisation for CCBS calls the B-subscriber while the B-subscriber line is busy and activates thereby a CW (destined to the B-subscriber) , and if successively the B-subscriber does not accept and not reject the waiting call, then - after a certain time interval - the
  • A-subscriber receives a 'busy' signal. If the A-subscriber successively requests for CCBS via the B-subscriber number, this request is rejected. In this case the A-subscriber cannot profit from CCBS.
  • Second case - combination of DIVDA and CCBS If the B-subscriber has activated DIVDA and if the A- subscriber having the authorisation for CCBS then calls the B-subscriber while the B-subscriber line is busy, the A- subscriber then receives an acoustical 'busy' signal. If the
  • the B-subscriber has activated DIVBY and indicated the C- subscriber as destination for the call diversion and if the A-subscriber calls the B-subscriber while the B-subscriber line is busy and the B-subscriber does not accept and not reject the waiting call, then the A-subscriber gets - after a certain time interval - the 'busy' tone signal . Particularly the call is not diverted to the C-subscriber. In this case the A-subscriber cannot profit from DIVBY.
  • a call set-up within the telecommunication network system initiated by an A-subscriber and destined to a B-subscriber while the line of the B- subscriber is busy, is either diverted to a C-subscriber or a service feature request by the waiting A-subscriber is accepted.
  • a service feature request is accepted.
  • a CCBS request by the A-subscriber destined to the B-subscriber is accepted, if
  • the A-subscriber calls the B-subscriber in a moment when the B-subscriber line is busy
  • the A-subscriber gets the busy tone
  • the invention makes it possible that the A-subscriber profits more from the service feature CCBS than it is possible after the state of the art.
  • a CCBS request by the A-subscriber addressed to the B-subscriber is accepted, if
  • the A-subscriber calls the B-subscriber in a moment when the B-subscriber line is busy
  • the A-subscriber gets the busy tone.
  • a call is diverted to the C-subscriber, if
  • the A-subscriber calls the B-subscriber in a moment when the B-subscriber line is busy
  • the invention makes it possible that the A-subscriber profits more from the service feature DIVBY than it is possible after the state of the art.
  • Fig. 1 A shows the state of the art for the combination CW and CCBS
  • Fig. 1 B shows the combination of CW and CCBS after the implementation of the invention
  • Fig. 2 A shows the state of the art for the combination DIVDA and CCBS
  • Fig. 2 B shows the combination of DIVDA and CCBS after the implementation of the invention
  • Fig. 3 A shows the state of the art for the combination CW and CCBS
  • Fig. 3 B shows the combination of CW and CCBS after the implementation of the invention.
  • Fig. 1 A shows the combination of the service features CW and
  • CCBS CCBS, respectively, as handled according to the state of the art in form of a very schematic flow diagram.
  • Time is represented in Fig. 1 A as indicated by the thick arrow 1 from top to bottom.
  • the A-subscriber is schematically represented by a line 2 and analogously the B-subscriber by a further line 3.
  • Telecommunication operations between the A- and the B-subscriber are involving elements of a telecommunication network system, e.g. switches. These parts are indicated by a dash-dotted line 4.
  • Fig. 1 A the case is considered that the A-subscriber has the authorisation for CCBS 5.
  • the arrow 6 indicates the call initiated by the A-subscriber destined to the B-subscriber in a moment when the B- subscriber line is busy as indicated by the capital letters 'BL' 7. Successively a timer is triggered to count a time interval 8, within the B-subscriber has the possibility to accept or to reject the waiting call. This is the service feature CW.
  • the B-subscriber does not accept and not reject the waiting call, indicated in Fig. 1 A by the cancelled capital letters 'AC and 'RE' 9, respectively.
  • the A-subscriber After the lapse of the time interval, the A-subscriber receives a 'busy' tone signal, as indicated by the capital letters 'BT' 11. Successively, the A-subscriber requests 12 for CCBS. This request 12 is forwarded to an element of the telecommunication network system 4, e.g. a switch. Finally the A-subscriber is notified 13 that the- request has been rejected as indicated by the capital letters 'RE' 14.
  • Fig. 1 B shows the situation when applying the present invention. All numbers, signs and symbols have the same meanings as in Fig. 1 A. The difference to Fig. 1 A is that the request 12 by the A-subscriber for CCBS is accepted as indicated by the capital letters 'AC 15.
  • the successive part of the CCBS-procedure is completely in accordance with the current operation of the CCBS-procedure.
  • Fig. 2 A shows the combination of the service features DIVDA and CCBS, respectively, as handled according to the state of the art in form of a very schematic flow diagram. Where not marked else, all numbers, signs and symbols have the same meanings as in Fig. 1 A.
  • Fig. 2 A the case is regarded that the A-subscriber has the authorisation for CCBS 5 and the B-subscriber has activated DIVDA 16.
  • the arrow 6 indicates the call initiated by the A-subscriber, destined to the B-subscriber in a moment when the B- subscriber line is busy 7. Successively the A-subscriber gets the 'busy' tone signal 11. Successively the A-subscriber requests 12 for CCBS. Finally the request is rejected 13 as indicated by the capital letters 'RE' 14.
  • Fig. 2 B shows the same situation as shown in Fig. 2 A after an implementation of the invention. All numbers, signs and symbols have the same meaning as in Fig. 2 A. The difference is that the request 12 by the A-subscriber for CCBS is accepted as indicated by the capital letters 'AC' 15.
  • the successive part of the CCBS-procedure is completely in accordance with the current operation of the CCBS-procedure.
  • Fig. 3 A shows the combination of the service features CW and DIVBY, respectively as handled according to the state of the art indicated in the same schematic way as in the preceding figures. Where not marked else, all numbers, signs and symbols have the same meanings as in the preceding figures .
  • Fig. 3 A the case is regarded that the B-subscriber has activated DIVBY 17 and indicated the C-subscriber 30 as destination for a call diversion.
  • the arrow 6 indicates the call initiated by the A-subscriber, destined to the B-subscriber in a moment when the B- subscriber line is busy 7. Successively a timer starts and counts a time interval 8, within the B-subscriber has the possibility to accept or to reject the waiting call. This is the service feature CW.
  • the B- subscriber does not accept and not reject the waiting call, indicated by the cancelled capital letters 'AC and 'RE' 9, respectively.
  • Fig. 3 B shows the same situation as shown in Fig. 3 A after an implementation of an embodiment of the invention. All numbers, signs and symbols have the same meaning as in Fig. 3
  • this time interval 32 is within the first time interval 8, i.e. before the A- subscriber would receive the 'busy' tone signal, the call is diverted.
  • the time interval 32 may be determined in any other way, as long as it is certified that the diversion step is performed.
  • the invention enables a subscriber to profit more from the service feature CCBS - compared to the state of the art - in the case of an overlap in time of CW with CCBS or DIVDA with CCBS.
  • the invention enables a subscriber to profit more from the service feature DIVBY - compared to the state of the art - in the case of an overlap in time of CW with DIVBY.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)

Abstract

The invention relates to service features for subscribers in a telecommunication network system such as ISDN. According to the invention certain combinations of service features are enabled to interwork properly in special situations. Especially the case is regarded that the A-subscriber (2) calls (6) the B-subscriber (3) while the B-subscriber line (3) is busy (7). Using the ISDN terminology these service feature combinations are: (i) Call Waiting (CW), followed by Call Completion To Busy Subscriber (CCBS); (ii) Call Diversion On No Answer (DIVDA), followed by CCBS; (iii) CW, followed by Call Diversion On Busy (DIVBY). In the cases (i) and (ii) a CCBS request (12) by the A-subscriber (2) is accepted (15), in case (iii) the call (6) by the A-subscriber (2) is diverted (31).

Description

Interworking of B-side subscriber features for subscribers in a telecommunication network system
The present invention relates to telecommunication systems and more particular to service features for subscribers. Such feature services are e.g. commonly used in Integrated Services Digital Networks (ISDN) .
The following description refers to the case that the invention is used within an ISDN telecommunication system. The present invention, however, relates to any telecommunication network system showing features corresponding to ISDN features as far as relevant with respect to the present invention.
The function of the aforesaid service features is explained in the following as far as it concerns the present invention: • A service feature, called 'Call Waiting' (CW) in the following, which uses a signal to alert a B-subscriber having an active line that a call request is made to that subscriber. The B-subscriber has in principle three possibilities to respond thereto: He may accept, reject or ignore the waiting call.
The B-subscriber has the possibility to accept the waiting call within a certain, predetermined time interval. To realise the acceptation, the B-subscriber either has to hold or quit his original connection.
In case that the B-subscriber holds the connection, he usually has subsequently the possibility to switch-over between the original and the new connection.
A muted ring or an optical sign on a screen can be used as the signal.
• A service feature, called 'Call Diversion On Busy'
(DIVBY) in the following, which routs a call initiated by an A-subscriber destined to a B-subscriber forward to a C-subscriber in case the B-subscriber line is busy (occupied) and provided that the B-subscriber has activated this service feature and indicated the C- subscriber as destination for the call diversion.
• A service feature, called 'Call Diversion On No Answer' (DIVDA) in the following, which routs a call initiated by an A-subscriber destined to a B-subscriber forward to a C-subscriber in case the B-subscriber does not accept and does not reject the call, provided the B-subscriber has activated this service feature and indicated the C- subscriber as destination for the call diversion.
• A service feature, called 'Call Completion To Busy Subscriber' (CCBS) in the following, which operates as follows: If an A-subscriber calls a B-subscriber while the B-subscriber line is busy, then the A-subscriber has the possibility to request for a re-call. If the request is accepted, the A-subscriber will be notified (e.g. by a call) as soon as the B-subscriber line becomes available and subsequently the A- and the B-subscriber can get connected. Prerequisite for that is that the A-subscriber has the authorisation for this service. In the case of the current version of ISDN2 - as it is commonly used today in the private sector - a line has two basic channels, usually called B-channels or B speech channels (besides a signal channel, usually called D-channel or D signalling channel) and in this case a 'busy line' means that both speech channels of a subscriber line are active
(occupied) .
As soon as the activation of at least two of these service features concerning one subscriber line coincide, some problems may arise, if the features are not compatible with each other. This will be regarded below for three special cases :
First case - combination of CW and CCBS:
If the A-subscriber having the authorisation for CCBS calls the B-subscriber while the B-subscriber line is busy and activates thereby a CW (destined to the B-subscriber) , and if successively the B-subscriber does not accept and not reject the waiting call, then - after a certain time interval - the
A-subscriber receives a 'busy' signal. If the A-subscriber successively requests for CCBS via the B-subscriber number, this request is rejected. In this case the A-subscriber cannot profit from CCBS.
Second case - combination of DIVDA and CCBS: If the B-subscriber has activated DIVDA and if the A- subscriber having the authorisation for CCBS then calls the B-subscriber while the B-subscriber line is busy, the A- subscriber then receives an acoustical 'busy' signal. If the
A-subscriber thereupon requests for CCBS via the B-subscriber number, this request is rejected. In this case the A- subscriber cannot profit from CCBS. Third case - combination of CW and DIVBY:
If the B-subscriber has activated DIVBY and indicated the C- subscriber as destination for the call diversion and if the A-subscriber calls the B-subscriber while the B-subscriber line is busy and the B-subscriber does not accept and not reject the waiting call, then the A-subscriber gets - after a certain time interval - the 'busy' tone signal . Particularly the call is not diverted to the C-subscriber. In this case the A-subscriber cannot profit from DIVBY.
In view of the complications encountered in connection with coincidences of service features, it is the object of the invention to enlarge the possibilities of the usage of combinations of service features for subscribers in a telecommunication system.
This object is achieved by the invention as defined in claim 1. Additional features of the invention are given in the dependent claims.
According to the present invention a call set-up within the telecommunication network system initiated by an A-subscriber and destined to a B-subscriber while the line of the B- subscriber is busy, is either diverted to a C-subscriber or a service feature request by the waiting A-subscriber is accepted.
At first, the case is regarded that a service feature request is accepted. According to an embodiment of the invention, a CCBS request by the A-subscriber destined to the B-subscriber is accepted, if
• the A-subscriber has the authorisation for CCBS • the request by the A-subscriber is done after the following steps, respectively:
(1) the A-subscriber calls the B-subscriber in a moment when the B-subscriber line is busy
(2) CW is activated (3) the B-subscriber does not accept and not reject the waiting call
(4) after a certain time interval, the A-subscriber gets the busy tone
Thereby the invention makes it possible that the A-subscriber profits more from the service feature CCBS than it is possible after the state of the art.
According to another embodiment of the invention, a CCBS request by the A-subscriber addressed to the B-subscriber is accepted, if
• the A-subscriber has the authorisation for CCBS
• the B-subscriber has activated DIVDA and indicated the C- subscriber as destination for a call diversion • the request by the A-subscriber is done after the following steps, respectively:
(1) the A-subscriber calls the B-subscriber in a moment when the B-subscriber line is busy
(2) the A-subscriber gets the busy tone. Thereby again the invention makes it possible that the A- subscriber profits more from the service feature CCBS than it is possible after the state of the art.
Next the case is regarded that a call is diverted.
According to an embodiment of the invention, a call is diverted to the C-subscriber, if
• the B-subscriber has activated DIVBY and indicated the C- subscriber as destination for a call diversion
• the following steps are done, respectively:
(1) the A-subscriber calls the B-subscriber in a moment when the B-subscriber line is busy
(2) CW is activated (3) the B-subscriber does not accept and not reject the waiting call within a certain time interval
Thereby the invention makes it possible that the A-subscriber profits more from the service feature DIVBY than it is possible after the state of the art.
In the following a detailed description of the invention is given using the schematic illustrations in the figures, wherein
Fig. 1 A shows the state of the art for the combination CW and CCBS;
Fig. 1 B shows the combination of CW and CCBS after the implementation of the invention; Fig. 2 A shows the state of the art for the combination DIVDA and CCBS;
Fig. 2 B shows the combination of DIVDA and CCBS after the implementation of the invention; Fig. 3 A shows the state of the art for the combination CW and CCBS, and
Fig. 3 B shows the combination of CW and CCBS after the implementation of the invention.
Fig. 1 A shows the combination of the service features CW and
CCBS, respectively, as handled according to the state of the art in form of a very schematic flow diagram. Time is represented in Fig. 1 A as indicated by the thick arrow 1 from top to bottom. The A-subscriber is schematically represented by a line 2 and analogously the B-subscriber by a further line 3. Telecommunication operations between the A- and the B-subscriber are involving elements of a telecommunication network system, e.g. switches. These parts are indicated by a dash-dotted line 4.
In Fig. 1 A the case is considered that the A-subscriber has the authorisation for CCBS 5.
The arrow 6 indicates the call initiated by the A-subscriber destined to the B-subscriber in a moment when the B- subscriber line is busy as indicated by the capital letters 'BL' 7. Successively a timer is triggered to count a time interval 8, within the B-subscriber has the possibility to accept or to reject the waiting call. This is the service feature CW. In the case shown in Fig. 1 A, the B-subscriber does not accept and not reject the waiting call, indicated in Fig. 1 A by the cancelled capital letters 'AC and 'RE' 9, respectively.
After the lapse of the time interval, the A-subscriber receives a 'busy' tone signal, as indicated by the capital letters 'BT' 11. Successively, the A-subscriber requests 12 for CCBS. This request 12 is forwarded to an element of the telecommunication network system 4, e.g. a switch. Finally the A-subscriber is notified 13 that the- request has been rejected as indicated by the capital letters 'RE' 14.
Fig. 1 B shows the situation when applying the present invention. All numbers, signs and symbols have the same meanings as in Fig. 1 A. The difference to Fig. 1 A is that the request 12 by the A-subscriber for CCBS is accepted as indicated by the capital letters 'AC 15.
The successive part of the CCBS-procedure is completely in accordance with the current operation of the CCBS-procedure.
Fig. 2 A shows the combination of the service features DIVDA and CCBS, respectively, as handled according to the state of the art in form of a very schematic flow diagram. Where not marked else, all numbers, signs and symbols have the same meanings as in Fig. 1 A.
In Fig. 2 A the case is regarded that the A-subscriber has the authorisation for CCBS 5 and the B-subscriber has activated DIVDA 16.
The arrow 6 indicates the call initiated by the A-subscriber, destined to the B-subscriber in a moment when the B- subscriber line is busy 7. Successively the A-subscriber gets the 'busy' tone signal 11. Successively the A-subscriber requests 12 for CCBS. Finally the request is rejected 13 as indicated by the capital letters 'RE' 14.
Fig. 2 B shows the same situation as shown in Fig. 2 A after an implementation of the invention. All numbers, signs and symbols have the same meaning as in Fig. 2 A. The difference is that the request 12 by the A-subscriber for CCBS is accepted as indicated by the capital letters 'AC' 15.
The successive part of the CCBS-procedure is completely in accordance with the current operation of the CCBS-procedure.
Fig. 3 A shows the combination of the service features CW and DIVBY, respectively as handled according to the state of the art indicated in the same schematic way as in the preceding figures. Where not marked else, all numbers, signs and symbols have the same meanings as in the preceding figures .
In Fig. 3 A the case is regarded that the B-subscriber has activated DIVBY 17 and indicated the C-subscriber 30 as destination for a call diversion.
The arrow 6 indicates the call initiated by the A-subscriber, destined to the B-subscriber in a moment when the B- subscriber line is busy 7. Successively a timer starts and counts a time interval 8, within the B-subscriber has the possibility to accept or to reject the waiting call. This is the service feature CW. In the case shown in Fig. 3 A, the B- subscriber does not accept and not reject the waiting call, indicated by the cancelled capital letters 'AC and 'RE' 9, respectively.
Especially the call is not diverted.
After the lapse of the time interval, the A-subscriber receives the 'busy' tone signal 11. Fig. 3 B shows the same situation as shown in Fig. 3 A after an implementation of an embodiment of the invention. All numbers, signs and symbols have the same meaning as in Fig. 3
A. The difference is that the call by the A-subscriber is diverted 31 to the C-subscriber after a further certain time interval 32.
In the embodiment shown in the figure, this time interval 32 is within the first time interval 8, i.e. before the A- subscriber would receive the 'busy' tone signal, the call is diverted. The time interval 32, however, may be determined in any other way, as long as it is certified that the diversion step is performed.
The advantages of the present invention may be summarised as follows :
• The invention enables a subscriber to profit more from the service feature CCBS - compared to the state of the art - in the case of an overlap in time of CW with CCBS or DIVDA with CCBS.
• The invention enables a subscriber to profit more from the service feature DIVBY - compared to the state of the art - in the case of an overlap in time of CW with DIVBY.

Claims

Claims
1. Method for enabling interworking of feature services in a telecommunication network showing feature services which support communication between A- , B- and C-subscribers, the method comprising the following step: in case that the B-subscriber (3) having a busy line (7) does nor accept neither reject (9) an incoming call (6) from the A-subscriber (2) , the call is either diverted (31) to the C-subscriber (30) or a service feature request (12) by the waiting A-subscriber (2) is accepted (15) .
2. Method as claimed in claim 1, characterised in that a first service feature performs a connection between the A-subscriber (2) and the B-subscriber (3) in case that the A-subscriber (2) requests it successively after the A-subscriber (2) has called (6) the B- subscriber (3) while the B-subscriber line (3) is busy (7) , wherein the connection is performed as soon as the B-subscriber line (3) is available again.
3. Method as claimed in claims 1 or 2, characterised in that a second service feature uses a signal to alert a subscriber having a busy line (7) that another call is waiting.
4. Method as claimed in claim 3, characterised in that the call from the A-subscriber (2) activates the second service feature and the step is an acceptation (15) of the request (12) of the A-subscriber (2) for the first service feature.
5. Method as claimed in one of the claims 1 to 4, characterised in that a third service feature diverts a call (6) destined to the B-subscriber (3) to the C-subscriber (30) in case the B-subscriber (3) does neither accept nor reject (9) the call (6) and has indicated the C-subscriber number as a destination for the call diversion.
6. Method as claimed in claim 5, characterised in that the call from the A-subscriber (2) activates the third service feature and the step is an acceptation (15) of the request (12) of the A-subscriber (2) for the first service feature.
7. Method as claimed in claim 1, characterised in that the step of diverting the call (6) is performed upon the lapse of a pre-set time interval (32) .
8. Method as claimed in claim 7, characterised in that a fourth service feature diverts (31) a call (6) destined to the B-subscriber (3) to the C-subscriber (30) in the case that the B-subscriber line (3) is busy (7) and the B-subscriber (3) has indicated the C-subscriber (30) number as the destination number for the call diversion.
9. Method as claimed in claim 9, characterised in that the step is a diverting (31) of the call (6) to the C-subscriber (30) within the fourth service feature.
10. Method as claimed in claim 9 or 10, characterised in that a second service feature uses a signal to alert a subscriber having a busy line (7) that another call is being made to that line.
11. Method as claimed in claim 11, characterised in that the call (2) from the A-subscriber (2) activates the second service feature and the step is a diversion (31) of the call (6) to the C-subscriber (30) within the fourth service feature.
12. Method as claimed in one of the claims 1 to 12, wherein the telecommunication network is an integrated services digital network (ISDN) .
PCT/EP2002/004261 2001-04-27 2002-04-17 Interworking of b-side subscriber features for subscribers in a telecommunication on network WO2002089495A2 (en)

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EP01110499.9 2001-04-27

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WO2002089495A3 (en) 2003-11-20
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