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Class Information
Number: 379/277
Name: Telephonic communications > Centralized switching system > Switching controlled in response to called station addressing signal > Having shared or common switching control > Having multistage switching > Path selection or routing > With busy or idle test
Description: Subject matter which determines whether a line or a switching element is in use.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7308477 |
Unified messaging system configured for transport of encrypted messages |
Dec. 11, 2007 |
| 6956858 |
Network routing table and packet routing method |
Oct. 18, 2005 |
| 6201854 |
System and method for telephone number verification and identification |
Mar. 13, 2001 |
| 5793858 |
Method for improving call completion rates in telephony |
Aug. 11, 1998 |
| 5535269 |
Additional direct inward dialing connection system |
Jul. 9, 1996 |
| 5467395 |
Telephone exchange apparatus |
Nov. 14, 1995 |
| 4744102 |
Crossbar line hunting arrangement |
May. 10, 1988 |
| 4672662 |
Switching system and method for network having a plurality of terminal control equipment units |
Jun. 9, 1987 |
| 4613969 |
Method for controlling a multistage space switching network |
Sep. 23, 1986 |
| 4536618 |
Telephone line interface |
Aug. 20, 1985 |
| 4460807 |
Conference routing arrangement |
Jul. 17, 1984 |
| 4191860 |
Data base communication call processing method |
Mar. 4, 1980 |
| 4035773 |
Control of leakage currents in a switching matrix |
Jul. 12, 1977 |
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