Telephonic communications – Special services – Anonymous party
Patent
1997-07-09
2000-06-13
Zele, Krista
Telephonic communications
Special services
Anonymous party
379207, 379219, 379229, 379230, 379231, 379232, 379233, 379234, H04M 342
Patent
active
06075852&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to telecommunications, e.g. telephone systems and in particular to systems incorporating one or more private networks.
BACKGROUND TO THE INVENTION
A conventional telecommunications private network comprises a number of private exchanges or switches (PBX's) interconnected via private telephone lines and each of which serves a number of telephone or user terminals. The PBX's of the private system are interconnected by private leased lines which are installed by the appropriate telephone service supplier. Call routing and call handling within the private network are controlled via the PBX's.
In addition to a basic telephony service (POTS) a private network is generally required to provide additional features such as call forwarding, call transfer, ring-back when free and conference calls. These features are not in general provided on a public network as they are specific requirements of business rather than domestic subscribers.
A further service that is finding increasing usage is that of providing a direct dialling facility to telephone extensions attached to a PBX. For example the CENTREX system provides such a service.
An approach to the problem of integrating public and private networks is described in specification No. WO 93/15583 which relates to a method of providing system and network independent dedicated private circuit telecommunications functionality using separate signalling and transmission network bearers.
The provision of private leased lines represents a significant capital investment by the telephone service supplier. Furthermore these leased lines represent an underused asset as they are in significant use, for only a part, typically about one third, of the twenty four hour cycle. However, during their idle period, these lines are not available to carry telephone traffic, e.g. to reduce an overload, for subscribers other than the private user to whom the lines have been leased. Expansion of the network is also difficult, as new dedicated lines have to be provided for new business subscribers. Various workers have addressed this problem by providing systems in which a private network comprises a number of local networks interconnected by non-dedicated public network paths. This however introduces the problem that certain features provided on the private network may not be available on the public network and there is thus a need to provide feature transparency for private network calls routed across the public network, i.e. to provide private network users with the perception that their network comprises a single seamless network.
OBJECT OF THE INVENTION
An object of the invention is to minimise or to overcome the above disadvantage.
It is a further object of the invention to provide a system in which calls between private network users are routed via a public network while providing private network feature transparency.
SUMMARY OF THE INVENTION
According to the invention there is provided a telecommunications system incorporating a switch based private network having a transparent network signalling system and having a plurality of nodes interfacing each via a switch with an intelligent public network, communication in use being effected between the nodes via the public network, wherein the public network incorporates a service control point having associated therewith a database containing destination addresses corresponding to call numbers received from the private network, in response to requests from a said node on behalf of a private service provided to a user of that node and from a public network switch on behalf of a private service provided to a directly connected user of that switch, characterised in that a call forwarding facility is provided, and that said database has means responsive to an indication from the network that a signalling transaction is call independent for inhibiting the call forwarding facility for that transaction.
According to a further aspect of the invention there is provided a method of routing call in
REFERENCES:
patent: 5253288 (1993-10-01), Frey et al.
patent: 5615253 (1997-03-01), Kocan et al.
patent: 5691973 (1997-11-01), Ramstrom et al.
patent: 5917901 (1999-06-01), Maxwell et al.
Ashworth Mark
Donaldson Iain Alexander
Bui Bing
Nortel Networks Corporation
Zele Krista
LandOfFree
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