A long time ago, I opened a ticket for an issue that I had. I wanted to extract SDP from multipart messages (this was in a SIP-I scenario case). To do so, I've had to modify a function in nua_session.c. I'm not used to C programming, but I  made sure the modifications only impacted the SDP multipart case which isn't supported anyway.

  The thing is, it was an important step to make a SIP-I call go through FreeSwitch. I've discussed this in verto with you, people. But, as I understood it, this couldn't be merged since it had to undergo regression testing.