How to connect public telephone lines into an intercom telephone system for outside phone calls.

How to connect public telephone lines into an intercom telephone system to enable you to make calls to outside locations and also be able to receive calls from outside locations.
This setup shows how to connect public switched telephone lines into the pbx switch.

• #science_technology
• #intercom_telephone_installation
• #pbx_installation
• #pabx_installation
• #connect_public_telephone_into_telephone_intercom
• #how_to_connect_public_telephone_lines_into_intercom_telephone_system