[reSIProcate] Missing 3GPP headers in SIP Stack

[sunil kumar <sunil230@xxxxxxxxx>]

Hi,

I am thinking of building IMS test system using resiprocate library. I was going over resiprocate SIP stack and I found that it is missing following P-Headers (P-Visited-Network-ID, P-Access-Network-Info, P-Charging-Function-Addresses and P-Charging-Vector). I saw the wiki page on how to add headers and parameters. Can I go ahead and add the following headers? 

If i want to contribute back to the community what is the process?

Thanks,

Sunil.