What is the Asterisk config to prevent SDP reformatting

Hi asterisk men
Please help me
I add some none standard attributes to sdp at caller(soft phone using pjsip library) and expect that receive them at callee, but received sdp at callee is reformatted sdp and my attributes are removed.
how should i config astersik to prevent reformatting sdp and removing extra sdp attributes?

I tested directmedia=yes and preferred_codec_only=yes but no getting a result.

is there any config to prevent asterisk doing such behavior or this impossible? :frowning: