What are E1 R2 Connections 

R2 signaling is a Channel Associated Signaling (CAS) system developed in the 1960s that is still in use today  in Europe, Latin America, Australia, and Asia. R2 signaling exists in several country versions or variants in  an international version called Consultative Committee for International Telegraph and Telephone (CCITT-R2). 

The E1 R2 signaling is an international signaling standard that is common to channelized E1 networks. 

In the Cisco Business Edition 3000, R2 signaling serves as a connection to the E1 interface for PSTN  connectivity. This connection is achieved by the installation of the country packs, and adding the E1 R2  connection through Cisco Business Edition 3000 Administrative Interface. 

You can set up the E1 R2 connection only if you have installed the Brazil, Mexico, or Saudi Arabia country  pack. The parameters of the E1 R2 interface may vary from one country to another and may also vary from  one service provider to another. You must install the country pack during First Time Setup (FTS) or at a later  stage import the COP file before you choose the provider for an E1 R2 PSTN connection. 

To add, edit, or delete E1 R2 connections, sign in to Cisco Business Edition 3000 Administrative Interface (Connections > PSTN Connections).