编译pjsip:
./configure --enable-shared --prefix=$PWD/pj_install
make install

编译uac：
g++ -L…/pjproject/pj_install/lib/ -I…/pjproject/pj_install/include -I…/pjproject/pj_install/include/pjsip-simple/ main.cpp -lpjsip -lpj -lpjlib-util -lpjsip-simple -o main

编译uas：
g++ -L…/pjproject/pj_install/lib/ -I…/pjproject/pj_install/include -I…/pjproject/pj_install/include/pjsip-simple/ main.cpp -lpjsip -lpj -lpjlib-util -lpjsip-simple -o main -fpermissive

执行：
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:…/pjproject/pj_install/lib/ ./main

参考：
程序 - https://github.com/pjsip/pjproject
样例 - https://download.csdn.net/download/dailu893/4749671