You've answered to yourself, TCP connections are session-based so the
client always uses an "ephemeral" port which is chosen dynamicaly by the
TCP stack of the OS. So depending on what you actually need to achieve,
it might be an option to set the port information in the scenario
manually to 5060 (in Via etc.) and use netfilter (iptables) to src-nat
the sent packets' source address and port to those you want (10.249.130.10:
5060)
But bear in mind that it will be possible to establish only one such TCP
session per remote socket address, as when a TCP session ends, there is
a guard time during which any packet coming from the same socket address
at client side is ignored by the server.
Pavel
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