Install libopenr2-3 by entering the following commands in the terminal:
sudo apt update sudo apt install libopenr2-3
MFC/R2 (telephony) call setup library
OpenR2 is a library that implements the MFC/R2 telephony signalling over E1 lines using the DAHDI Telephony interface. . The MFC/R2 protocol is a telephony signalling protocol, widely used in Latin America, China and Africa, similar to the ISDN protocols found in most of Europe and North America . This package contains a shared library implementing the protocol. . You may want to have a look at the Asterisk PBX for a telephony application that uses this library.