This chapter focuses on connecting two pods via a T1 connection as well as a serial port connection. T1 connectivity simulates connectivity between two different companies. A serial connection is more indicative of connectivity between two sites of the same company. Lab 7-2 introduces the idea of class of restriction (COR).
Phone digits sometimes need to be translated or manipulated to create communication between different sites. Reasons for digit manipulation include the following:
• Allow Cisco IP Phone users to call each other by simply dialing an extension number
• Allow IP Phone users to access the public switched telephone network (PSTN)