I'm sorry for pasting the whole code in the email. Here's a much more succinct version. pastebin of code is included below. I'm new to using freeswitch and need to set up so that i can use a webrtc data channel to connect two clients together. I'm using SIPJS. I followed the guide to setting up webrtc on freeswitch end, however to begin with it gave a 488 error and INCOMPATIBLE_DESTINATION. Finding out about this led me to codec negotation (the logs showed that when sending the invite from client A produced a CODEC NEGOTATION ERROR) Then I followed a codec negotation guide on the confluence page, however I'm new to freeswitch. The guide talked about outbound and inbound, however it then talked about a profile for outbound. I have an internal and external profile, and was setting the variables there. Having set inbound-late-negotation and inbound-zrtp-passthru and not finding the others in the profile, i restarted freeswitch to get this error: (on both internal and external profile) i'll give you the whole sip trace as it seems important. It would also be helpful to know what the internal profile is doing in terms of webrtc. the guide says that internal is only used internally. As in the local network. Im not connected to freeswitch locally. what is the purpose of the internal profile then? It was at points getting 503 service unavailable but it's gone back to 488. I'm not sure what the problem is. https://pastebin.freeswitch.org/view/ca875188 Nathan -- *Virtual Guard Ltd* *info@virtualguard.co.nz <info@virtualguard.co.nz>*