Hi Benny, First I will thank you for helping with my NAT detection problem and the deactivation of STUN and ICE at lifetime. I've tested two USB webcams on Win XP and I've seen that windows creates a network device with IP address 0.1.0.5. This address is in 0.0.0.0/8 which refers to source hosts on "this" network (RFC 3330). In pjsua and stateful proxy the detection of the local network addresses returns this address as default address and it binds the ports to this address. But using this address doesn't work. In TCPview I've seen that other applications doesn't use this address. How can I solve this problem ? Best regards, Helmut