Hi, I am developing my tool in Visual Studio 2008 using pjsip 2.0 without any video. My machine has 2 NICs as follows: Windows IP Configuration Ethernet adapter Local Area Connection 2: Connection-specific DNS Suffix . : IP Address. . . . . . . . . . . . : 10.52.230.74 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : IP Address. . . . . . . . . . . . : 131.160.81.63 Subnet Mask . . . . . . . . . . . : 255.255.252.0 Default Gateway . . . . . . . . . : 131.160.80.1 I would like my VoIP application to communicate to the Proxy over 10.52.230.74. I have set each of the following to 10.52.230.74 app_config.udp_config.public_addr app_config.udp_config.bound_addr app_config.rtp_config.public_addr app_config.rtp_config.bound_addr What is strange is that on the Wireshark trace, the packet source is shown as 10.52.230.74 but it is sent over the 131.160.81.63 interface(I have to activate the sniffer on the 131.160.81.63 to see any SIP messages) There are no SIP messages sent over 10.52.230.74 interface. I have tried to compare my tool with pjsua_app and things look the same. Any advice? Regards, Arjun -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120706/37e65418/attachment.html>