1975-03-25
1976-02-03
Robinson, Thomas A.
179 27CA, H04M 358
Patent
active
039366154
ABSTRACT:
A circuit is disclosed for providing trunk transfer in an electronic private automatic branch exchange which is built around a space divided solid state matrix. The trunk transfer circuit is enabled by a hookswitch flash from a transferring PABX station connected to an established incoming or outgoing trunk call and directs the trunk junctor associated with that call to place the connected trunk on hold. While the connected trunk junctor is in a held status, the transferring PABX station is forwarded to a local junctor by the trunk transfer circuit and a connection is established from the local junctor to a transferee PABX station. The trunk transfer circuit then completes the transfer by establishing a connection between the held trunk and the transferee PABX station via the held trunk junctor. Further circuitry is provided in the trunk transfer circuit to establish a three-way conference call between the connected trunk call (transferred party), the transferring PABX station, and the transferee PABX station, if desired. Also included in the trunk transfer circuit are circuits for releasing the local and trunk junctors or reestablishing the original trunk call if the trunk transfer cannot be completed
REFERENCES:
patent: 3221108 (1965-11-01), Seemann et al.
patent: 3513263 (1970-05-01), Bastian et al.
patent: 3769462 (1973-10-01), Russell et al.
patent: 3786194 (1974-01-01), Pinede et al.
patent: 3843845 (1974-10-01), Ridley
Marvin William A.
Porter, Jr. William F.
Robinson Thomas A.
Stromberg-Carlson Corporation
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