1, pick up the phone or press the speakerphone and enter #787 1967590. After hearing the long tone, enter 29 items * * * #. Hang up the phone.

2. Pick up the phone or press speakerphone, enter #787 1967590 and hear a long prompt, enter 29 and enter 00 1 * 801(801is the extension you want to change, provided that it is1or 2 or. Hang up the phone.

Guowei telephone exchange domestic telephone exchange technology has made great progress in the 1990s. During this period, China scientific and technological researchers independently developed a number of large and medium-sized digital program-controlled telephone exchanges with international leading level.

Features Group telephone exchange does not need full-time operators and maintenance personnel, and all departments can know the working situation of the whole system through the indicator light. When an outside call comes in, it can be answered by any phone and transferred to the required called party. When any phone wants to dial an outside line, just press the corresponding key representing an idle outside line to dial an outside line.

According to the information transmission mode, it can be divided into analog switches and private branch exchanges. There are many telephones with external lines, which are suitable for institutions, organizations, small and medium-sized enterprises and other units, and can also be used for residential and secretary telephones.