Arrangement for sharing a telephone office code
US5440626A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1994 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Jul 28, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13515
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An end office of the PSTN, which employs independent switching networks which share one or more office codes, is served by a single assigned node on the CCS network. The signaling processor which serves the assigned node, screens all incoming call messages (IAM)'s; directs messages which include an appropriate Channel Identification Code (CIC) to the switching network that serves that CIC; rejects messages that include an improper CIC; and requests that the calling office assign a different CIC to the incoming call. In an alternate configuration, a signaling message intercept unit is interposed between a signal transfer point (STP) and end switches, to determine which of two or more switches should receive a message, based on the directory number, a circuit identifier or a message index of the received message, and forwards the message to the correct switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.