You can use an auto intercom feature button on your Expansion Module to call a specific extension in an intercom group.
The Auto icom feature button on Expansion Module displays two numbers with the label, for example, Auto icom (2 3). The first number denotes the intercom group number to which the extensions belong. The second number denotes the dial code of the destination extension. Your administrator can customize the button label. You also can edit the button label on Expansion Module. Your administrator can only edit the label text but not the numbers. Through the Expansion Module interface, you can edit the numbers as well.