Hi team, I am trying to change parameter RTP payload type (OPUS Code is dynamic) on FreePBX15 (free version) for an academic research. RTP media direct is a pre-requisite for my research, but something is wrong after debug with Wireshark, Linphone´s logs (two different extensions using PJSIP config) and FreePBX log.
During SIP/SDP negotation (200 Invite, etcetc…), FreePBX15 receive a RTP Payload type 96 from one of Linphones and delivery to the other calling leg( extension) another RTP Payload Type, 107 in my case.
So, In spite of local linked is closed (no Firewalls, no NAT, no routers …) RTP media direct does not allow pass audio (VoIP call). If I use ITU-T G.722 RTP media direct works perfectly, no connectivity problems. I have noticed on some topics in community and research with GenAI that I would need to change files like: “pjsip.endpoint_custom_post.conf”, I made it using just allowance to Opus and prefer type = 107 (or 96), I tried both. But, changing configuration files - FreePBX seems locked or somethig like that and it does´not allow me to authenticate anymore on extensions. It seems there are some kind of security or protection in Free version to avoid someone change config. files. There is no interface GUI to change them.
Is there any different way or good hint to solve it ? Locked on it, for many hours 
Thank you !
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