When 1 selects call forwarding, the system will play welcome navigation words (for example, press 1 in the accounting office and 2 in the customer service department, etc.). ). After the caller presses the button, the incoming call will be connected to the set phone. The disadvantage is that one key can only correspond to one mobile phone.

2 When the switchboard calls, the system plays welcome navigation words (for example, press extension 10 1 for the finance office and extension 102 for the customer service department). ). After the caller presses the key, the phone is connected to the set cadre number, and the phone is forwarded in order. The advantage is that each extension corresponds to multiple telephones.