Matches 1 - 9 out of 9
Match Document Document Title
4920565 Method for connection of secure conference calls  
The present invention provides a method and apparatus of making secure conference calls in which the bridging unit does not need to know any encryption keys and can function independently of the...
RE32789 Transmission trunk multichannel dispatch system with priority queuing  
A communication system of the type wherein a central station assigns a limited number of information channels to a requesting one of a plurality of remote stations is disclosed. The requesting...
4012597 Transmission trunk multichannel dispatch system with priority queuing  
A communication system of the type wherein a central station assigns a limited number of information channels to a requesting one of a plurality of remote stations is disclosed. The requesting...
3281542 Switching device  
2972023 Apparatus for repeating the last position of a magnetic recording  
2966552 System and apparatus for superimposing voice-time messages on signal recordings  
2881251 Apparatus for time multiplexing speech and short bursts of information  
2506437 Combined voice and facsimile system  
2481398 Selector system for magnetic wire reproducers  
Matches 1 - 9 out of 9