[sr-dev] persist changes in sdp_info_t

Hi guys, I am trying to change some fields in sdp_info_t structure. I am getting this structure by casting sip_msg_t->body to sdp_info_t structure. I am just wondering if there is need to somehow "persist" my changes done in sessions streams (sdp_stream_cell_t structure) to sip_info_t->raw_sdp so the changed values will be sent back to UA? I am just not really sure how this works so I am asking the community. I just want to find out if I am doing something wrong or there is not possible to change message's SDP through these structures. Thanks in advance