libopenr2-3 1.3.3-2 (arm64 binary) in ubuntu impish

 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.