Install libopal-dbg by entering the following commands in the terminal:
sudo apt update sudo apt install libopal-dbg
OPAL library debug symbols
This package contains the shared and static debug symbols of the OPAL library. . The OPAL project aims to create a full featured, interoperable, Open Source implementation of the H.323 and SIP protocols that can be used freely by everybody. These protocols are most used for Voice over IP (VoIP) conferencing.