Repair WebRTC function

We have an outgoing web app for making calls using webrtc, worked great yesterday. Some coder made a change and now our calls work on all extensions, BUT when dialed number answers phone the call disconnects. All code is already written, and previously working before change was made. We require expert in WebRTC & Asterisk to help make repair. We also require remote session for all work, as we do not allow unsupervised acces to our server files.