DE1003278B - Circuit arrangement for telephone private branch exchanges with responder for preferred speech stations - Google Patents

Description

GERMAN

In telephone private branch exchanges, it is desirable a message to the calling subscriber if the subscriber of an extension is absent to transmit, which asks him, for example, to call again after a certain time. For this purpose, it is known to assign answerers to the extensions, which when a Conversation to be switched on to the speech wires and the answer specified by the participant dem to the calling subscriber via the speech wires. After the responder has expired, the connection will be separated.

But now it is possible that the caller has to make an urgent announcement for the extension subscriber should be transmitted to the intercom immediately after his return. Further it may be desirable that, in the absence of the desired subscriber, the caller should contact a want to contact another participant. Since in known systems, as already stated, After the playback device has run out, the existing connection is disconnected, the caller would have to do it again call the second subscriber he wants and would have to pay double the charges.

The present invention overcomes this disadvantage. This is achieved by the one Extension assigned answering machine at the end of the announcement to the calling exchange subscriber Indicator is transmitted over the existing connection path that the activation of a signal arranged for the subsidiary officer.

In the drawing, an embodiment of the invention is shown with the essential details. In the description, all of them are not necessarily necessary for an understanding of the invention Details omitted.

If the extension subscriber leaves his call station, he has to close the switch S. "This energizes the relay U:

Earth, switch S, relay U, -.

The relay closes its contacts 2 μ and 4m after armature tightening, therefore relay IA is energized when a call is made and closes its contacts 5 α, 6 α and 7 a. The playback device WG is connected to the line via the contacts Sa, 6a and can now put its stored text on the line, which is received by the calling subscriber. After the text has been sent, a message follows that after the tape has expired, the secondary office clerk enters the conversation and the subscriber can announce his special connection requests to him.

Simultaneously with the connection of the playback circuit arrangement

for telephone PBXs

with responder for preferred

Intercom stations

Applicant:
Siemens Sd Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Witteisbacherplatz 4

Dipl.-Ing. Gerhard Freyer, Graefelfing near Munich,
has been named as the inventor

device connected to the telephone line, relay I B is energized via contact 7 α:

Earth, contact 7a, relay HA, relay IB, break contact rk of the playback device, · - ■.

The contact 12b switches on the playback device WG via the starting line, which outputs the text to the line via the contacts Sa, 6a previously referred to. The contact 8 b prepares the holding circuit for the relay winding II B , which is excited when the normally open contact ak of the playback device is actuated:

Earth, contact 8 6, relay winding 115, normally open contact ak, -.

When the playback device starts up, the normally closed contact rk is opened and the circuit for the relay windings 11 ^ 4 and Ii? opened. Relay A drops out, relay B remains held by winding II. At the end of the announcement to the calling subscriber, an earth contact ek is mechanically closed and the differential relay X of the extension switchboard NZ is excited via the following signal circuit:

Earth, earth contact ek, contact 9 b, contact 2 m, α wire, selector PF, relay IIX, relay USp, -.

Relay X attracts its armature and energizes relay D via contact 13jtr:

Earth, contact 13 x, relay D, contact as, -.

Relay D then remains in a local circuit via its own contact 14 d:

Earth, contact 14 d, relay D, contact as, -.
The extension exchange is a call lamp AL

609 837/146

assigned, which is switched on via the contact 15 d and the interrupter U in the flickering rhythm and thereby indicates that the extension officer should switch to the existing connection. The extension officer can connect to the voice lines via an official connection BA and thus get in touch with the calling subscriber. The existing connection is released by the extension officer.

Claims (2)

PATENT CLAIMS: 1. Circuit arrangement for telephone private branch exchanges with responder for preferred Intercom stations, characterized in that the answering device assigned to an extension (contact ek) at the end of the announcement to the calling office subscriber transmits an identifier over the existing connection path, which causes the activation of a signal (AL) for the extension officer. 2. Circuit arrangement according to claim 1, characterized in that a differential relay (X) of the feed bridge (X / Sp) is switched on by temporary earth connection via the existing speech connection, which controls the call lamp (AL) of the exchange transmission. 1 sheet of drawings