Be careful, SIP is not an easy protocol and headers can contain tricky informations that may appear wrong but are used for something else...
I think you should play with parameters in Linphone preferences: I noticed that header content and strange behaviors are related to a particular interpretation of Linphone preferences. Take a look at the firewall settings (direct/public/STUN which gave me problems in the past) and the "default identity" in accounts menu.
(Last time I used it, I used STUN even if not required because of my strict router with strange SIP ALG behaviors. I have a special configuration and thus cannot tell you more for a normal situation...)
I also had to create a dummy account with identity "sip:1234@192.168.123.45" so as to be available in the main GUI, below, in the listbox where you can select which account you want to use... Maybe this is what you are looking for.
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