[SFLphone] Change "User-Agent" header

[Thomas Alexander Ewald]

Hello,

I like to use this software very much, but I have a problem.
My company SIP server blocks SIP client software based in the 
User-Agent. Right now the only "authorized" client doesn't run on Wine.
I was trying do find in the sources where can I change to make sflphone 
( or sflphoned ) to send another "User-Agent" header.
I found that using the python client this is possible, but I didn't find 
where to change to use the gtk client.
I also don't know if the sflphoned is always setting the "User-Agent" 
header.
Is there a way to do this?
I have average programming skills, so I'm no afraid of changing code if 
needed :-)

Thanks!
--
Thomas Alexander Ewald

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