Variable sip copy multipart
FreeSWITCH supports only INVITEs with multipart bodies. FreeSWITCH does not support response messages such as 183 Session Progress or 200 Ok with multipart bodies. Typically SIP bodies only have one MIME part with an SDP using MIME type application/sdp. The SIP spec allows for multiple bodies defined with MIME type multipart/mixed. In this case FreeSWITCH will do it's best to find the MIME part with the SDP and parse that as it normally does. However, you can change FreeSWITCH behavior with multipart bodies and bridge using this variable.
To have FreeSWITCH keep the multiple MIME parts intact when using bridge (default):
<action application="set" data="sip_copy_multipart=true"/>
NOTE: FreeSWITCH will "do the right thing" and attach an application/sdp type generated by FreeSWITCH (per your settings) for the B leg as it normally would. The other non-SDP MIME parts just pass through.
To have FreeSWITCH strip the multiple MIME parts when using bridge:
<action application="set" data="sip_copy_multipart=false"/>