Matches 151 - 175 out of 175 < 1 2 3 4
Match Document Document Title
4529841 Intercept information display for a private automatic branch exchange telephone system  
The central unit of a PABX telephone system includes an associated computer unit that operates to provide visual information to an operator when calls to an extension in the system are to be...
4527013 Telephone answering system  
A telephone answering system is disclosed capable of accommodating geographically dispersed customer stations and obviating the need for any dedicated concentrators or distributors. The TAS bureau...
4399532 Methods of and systems for monitoring a first call connection while effecting the establishment of a second call connection  
A second-incoming call appears at an attendant facility (34) within a PBX system (20) while the attendant is awaiting a response on a first-incoming call. The attendant activates an overlap button...
4317960 Telephone-conferencing and inquiry-handling apparatus and method  
A telephone conferencing and inquiry handling apparatus and method provide a plurality of incoming calls with access to one or more ongoing or new communications groupings or pools. Apparatus for...
4309572 Call processing system with an operator assistance in a telephone switching system  
In a telephone switching system having a main-speech-path switch, connected to a plurality of subscribers and a plurality of board trunks, the connection in the main-speech-path switch is...
3920908 Buyer credit service for a telephone system  
A credit center detachably connectible to a traffic service position system (TSPS) connecting calling and called telephone sets for enabling the calling set to obtain a service on credit from the...
3917908 Call concentrator with expanded intracall capability  
A call concentrator is disclosed which makes maximum use of a limited number of trunks by establishing intracalls through direct AC connections between trunk terminals. The two trunks that would...
3909545 Emergency transfer circuit for use in a communication switching system  
An emergency transfer circuit for permitting an operator to extend an emergency-type call via a toll switchboard trunk circuit in the event of malfunction in the switching equipment.
3889070 Tone detecting telephone connection monitor  
The specification hereof discloses a tone signal monitor for purposes of supervising remote telephone connections which have been temporarily established and which are to be monitored and...
3809823 AUTOMATIC DISTRIBUTION OF SUBSCRIBER ASSISTANCE CALLS  
A technique for automatic distribution of calls to directory assistance operators' positions. Means are provided for effectively equalizing loads among operators and teams of operators and...
3786198 CIRCUIT AND APPARATUS FOR BRIDGING AND MONITORING  
A telephone bridging apparatus which can be utilized with telephone switchboards such as those provided by an answering service. The apparatus in part comprises an insertable module in the...
3733440 SEMIAUTOMATIC CALL PLACEMENT AND MESSAGE DELIVERY ARRANGEMENT  
An arrangement is disclosed as an applique to a PBX to allow a PBX attendant to originate a series of message delivery calls. The attendant dials in PBX station numbers to which the message is to...
3509285 NO-TEST TRUNK CIRCUIT FOR PRIVATE BRANCH EXCHANGES  
3410960 No-test or busy verification in a private branch exchange telephone system  
3328535 Class of service communication switching system  
3297828 Operator position control equipment for serving calls on an overlap basis  
3176081 Cordless switchboard  
3173995 Transfer circuit for private branch exchange  
3127478 Autoamtic private exchange with facilities for breaking in and conference calls  
3050592 Message waiting indicating circuits  
2988602 Final selector for a telephone system  
2907832 Crossbar relay private branch exchange telephone system  
2874225 Busy-verification automatic telephone system  
2857472 Call-distributing telephone system  
2854522 Maximum security automatic telephone system  
Matches 151 - 175 out of 175 < 1 2 3 4