公开(公告)号：US3604854A

公开(公告)日：1971-09-14

申请号：US3604854D

申请日：1969-11-10

Applicant: ERICSSON TELEFON AB L M

Inventor： JACOBAEUS ANTON CHRISTIAN ,  BJORK JOHN CARL HAROLD

IPC: H04M3/44 ,  H04Q3/42 ,  H04M15/06

CPC classification number: H04Q3/42 ,  H04M3/44

Abstract: In an automatic telephone exchange certain subscribers can use short numbers instead of the directory numbers for calls to optionally selected extensions which often are called from the subscriber. The invention has for a purpose to indicate at the called subscriber''s instrument who is calling or has called with the use of a short number. A registering means for short numbers is arranged at the subscriber''s instrument. In the exchange identifying means and analyzer are arranged so that on one hand the identity of the called extension corresponding to a short number is indicated for connecting a telephone communication, on the other hand the short number of the calling subscriber valid at the called part is indicated for setting the registering means of the called subscriber''s instrument.