[OpenSER-Users] editing the via header

hello, I would like to know when the via header of the openser proxy is inserted (the new one). and/or if there is a practical way to manipulate it by me in a different module, like that some additional information is added after the branch tag. I browsed through the documentation and also googled but couldn't find valuable information how the via headers are treated in this respect. I found the reference in parser/msg_parser.h:struct sip_msg, that they reference via1/via2 but I assume via1 is not the current one which will be added by the local openser proxy. any additional information is greatly appreciated. thanks. regards, Othmar