Routing calls destined for inaccessible destinations
US5404350A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1993 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Nov 5, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2207/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An arrangement for selectively routing traffic to alternate destinations. If the network or switch for accessing the primary destination is inaccessible (i.e., out of service), as opposed to simply being busy, calls are routed to an alternate destination; however, if the primary destination is simply busy, calls are not routed to any alternate destination. This is useful, for example, for emergency (E911) calls which are routed to alternate emergency bureaus only if the network or switch for accessing the home bureau is out of service. Alternatively, the tandem switch can select an alternate toll carrier on the basis of allocation of traffic to different alternate toll carriers. The same general kind of arrangement can be used to route calls to an alternate toll carrier if the preferred toll carrier selected by the customer is not accessible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.