FD_ISSET 634 src/ftdm_m3ua.c if (FD_ISSET(pcon->socket, &efds) || FD_ISSET(mcon->socket, &efds)) { FD_ISSET 638 src/ftdm_m3ua.c if (FD_ISSET(pcon->socket, &rfds)) { FD_ISSET 644 src/ftdm_m3ua.c if (FD_ISSET(mcon->socket, &rfds)) {