Transmission of dialling signals from PBX extension over exchange line - involves connecting dialling signal converter to code translation allocated to line

摘要

The PBX has dial or key dialling, and the dialling signals are transmitted without accompanying signals. The exchange line is connected by a PBX operator to the calling extension. The exchange line is allocated by the operator who operates a key signalling that it is a case of extending an outgoing connection to a public telephone exchange through a partly selected or non-selected exchange line. The operator also operates a special key which, in addition to the allocation of the exchange line to the calling extension, connects a dialling signal converter to the exchange translation allocated to the line.