The extension number is relative to the switchboard number. Generally, companies or enterprises and institutions will purchase a group telephone or telephone switch in order to save external calls. The external lines or direct calls can be connected to the switch. You can set a All outside calls are connected to the switchboard and forwarded through the switchboard. You don’t need to fill in the form.

Extended information

CreditCard, also called credit card. It is a non-cash transaction payment method and a simple credit service.

A credit card is a credit certificate issued by a commercial bank or credit card company to consumers with qualified credit. Consumers holding credit cards can shop or consume at specially designated commercial service departments, and then the bank will settle the accounts with merchants and cardholders. Cardholders can overdraft within the prescribed limit.

The extension number is relative to the switchboard number. Generally, companies or enterprises and institutions will purchase a group telephone or telephone switch in order to save external calls. The external lines or direct calls can be connected to the switch. You can set a All outside calls are connected to the switchboard and forwarded through the switchboard.

Generally, the number of extensions a telephone exchange can access and branch out is determined by the model of the exchange. Each extension can be set with a 1-6 digit extension number. You can make any calls between extensions by using the extension number. For external calls and calls, the telephone exchange automatically allocates lines.

Reference materials: Credit card_Baidu Encyclopedia?Extension number_Baidu Encyclopedia