Hi Benny, Did you know what can cause this kind of error after running more than a day? The system is running on Linux and RTP packets are handled by the hardware, not by pjmedia. 04:29:46.903 udp0xfab94 Warning: pj_ioqueue_recvfrom: [err 120009] Bad file descriptor 04:29:46.904 udp0xfab94 Warning: pj_ioqueue_recvfrom: [err 120009] Bad file descriptor 04:29:46.906 udp0xfab94 Warning: pj_ioqueue_recvfrom: [err 120009] Bad file descriptor 04:29:46.907 udp0xfab94 Warning: pj_ioqueue_recvfrom: [err 120009] Bad file descriptor 04:29:46.908 udp0xfab94 Warning: pj_ioqueue_recvfrom: [err 120009] Bad file descriptor 04:29:46.909 udp0xfab94 Warning: pj_ioqueue_recvfrom: [err 120009] Bad file descriptor 04:29:46.911 udp0xfab94 Warning: pj_ioqueue_recvfrom: [err 120009] Bad file descriptor 04:29:46.912 udp0xfab94 Warning: pj_ioqueue_recvfrom: [err 120009] Bad file descriptor 04:29:46.913 udp0xfab94 Warning: pj_ioqueue_recvfrom: [err 120009] Bad file descriptor 04:29:46.914 udp0xfab94 Warning: pj_ioqueue_recvfrom: [err 120009] Bad file descriptor Regards, Gershon Szklo