nat=yes might cause this, since with NAT we cannot trust the IP or the port that is in the data part of the packet.

Andre Kirchner wrote:
I'm sending the following message from port X to port 5060 of another box 
running Asterisk, and it is answering back to port X from port 5060. Shouldn't 
Asterisk use the Via header to find out where to answer, and in this case send 
its answer to port 4000?

OPTIONS sip:192.168.0.103 SIP/2.0\r\n
Via: SIP/2.0/UDP 192.168.1.130:4000;branch=0.0\r\n
CSeq: 4711 OPTIONS\r\n\r\n
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