I am using Sofia with Empathy. When I try to register against an Asterisk PBX through an OpenVPN tunnel, the wrong IP is choosen when sending packets on the vpn interface: The network details: { @sigma ~ $> ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000 link/ether 00:24:e8:83:e5:d7 brd ff:ff:ff:ff:ff:ff 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 78:e4:00:6b:95:ff brd ff:ff:ff:ff:ff:ff inet 172.20.1.2/28 brd 172.20.1.15 scope global eth1 valid_lft forever preferred_lft forever 6: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 100 link/none inet 10.10.2.78 peer 10.10.2.77/32 scope global tun0 # Trimed the unnecesary routes { @sigma ~ $> ip route 10.10.2.77 dev tun0 proto kernel scope link src 10.10.2.78 172.20.1.0/28 dev eth1 proto kernel scope link src 172.20.1.2 metric 2 10.10.2.0/24 via 10.10.2.77 dev tun0 proto static 172.16.100.0/24 via 10.10.2.77 dev tun0 proto static default via 172.20.1.1 dev eth1 proto static The PBX is on the 172.16.100.0/24 network. So traffic should be generated from the 10.10.2.78 to 172.16.100.254, as stated by the routing table. Trying to register generates the following network packets. : { @sigma ~ $> sudo tcpdump -n -i tun0 host 172.16.100.254 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on tun0, link-type RAW (Raw IP), capture size 65535 bytes 11:40:19.311653 IP 172.20.1.2.51115 > 172.16.100.254.5060: SIP, length: 481 11:40:19.811837 IP 172.20.1.2.51115 > 172.16.100.254.5060: SIP, length: 481 11:40:20.811826 IP 172.20.1.2.51115 > 172.16.100.254.5060: SIP, length: 481 11:40:22.812170 IP 172.20.1.2.51115 > 172.16.100.254.5060: SIP, length: 481 11:40:26.812289 IP 172.20.1.2.51115 > 172.16.100.254.5060: SIP, length: 481 11:40:30.812746 IP 172.20.1.2.51115 > 172.16.100.254.5060: SIP, length: 481
This is a problem with sofia-sip. A workaround is to use the connection parameter local-ip-address, similarly to the Maemo recipe given here: https://bugs.maemo.org/show_bug.cgi?id=1860
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