1, Shenou and Huaheng SPC exchanges dial125 on the extension;
2. Most SPC exchanges of EuroUnion, China United and Yitai dial 30 or160 on the extension;
3. For the SPC exchange produced in Foshan, please dial extension 8 1 or *#8 1.
Supplement:
1, the intranet landline belongs to the program-controlled switch, which is called storage program-controlled switch (corresponding to wiring logic control switch, referred to as cloth control switch), also called program-controlled private branch exchange or digital program-controlled switch. Usually refers to the switching equipment used in telephone switching network, which controls the connection of telephone through computer program. Program-controlled exchange is a telephone exchange that uses modern computer technology to complete control and connection. The main functions are enterprise switchboard, telephone exchange function, forced disassembly and forced insertion, extension call and other enterprise telephone functions.
2. The main task of the switch is to realize the connection of calls between users. It is basically divided into two parts: voice equipment and control equipment. Voice equipment mainly includes various interface circuits (such as subscriber line interface and trunk line interface circuit). ) and switching (or connecting) networks; The control equipment mainly includes the marker and transmitter in the crossbar switch, while in the program-controlled switch, the control equipment is an electronic computer, including central processing unit (CPU), memory and input/output equipment.