Category Archives: new to lern


Starting Restcomm-Connect.htm:

Issue, Restcomm was not up and running
> Solution: Installed Java 7, and built from Source.

How to build Restcomm-Connect from source:


Once Restcomm is working. Used Olympus to test Restcomm


issue; web socket is not connecting

jain-sip.js:25448 WebSocket connection to ‘ws://’ failed: Connection closed before receiving a handshake responseWSMessageChannel.createWebSocket @ jain-sip.js:25448WSMessageChannel @ jain-sip.js:25439WSMessageProcessor @ jain-sip.js:25659SipStackImpl.createListeningPoint @ @ @ WebRTComm.js:4594$scope.connect @ register.js:122$parseFunctionCall @ angular.js:12336callback @ angular.js:21422$eval @ angular.js:14388$apply @ angular.js:14487(anonymous function) @ angular.js:21427dispatch @ jquery.js:4430elemData.handle @ jquery.js:4116
WebRTComm.js:4925 2016-14-11 21:34:25.110 WSMessageChannel:createWebSocket(): websocket connection has failed:[object Event]

Stack trace:
at commonLog (
at Object.console.error (
at WebSocket.websocket.onerror (



kurento monitoring java

Have a Kurento Room Application developed for company and looking for a way to monitor each call quality as well as monitor KMS components. Found very good example of kms monitoring java project. The project shows how to see media stream on a Kurento Application server developed with java.

Reference Link


WebRTC Main Links



Kurento Audio Quality during Call / Recorded

WebRTC Call quality is decided by SDP

Anatomy of a WebRTC SDP

Status on javascript.


Kurento records a call into .webm format

what is webm? WebM is defined as a video and audio container format to provide high quality, royalty-free, open video compression for use with HTML5 video. The WebM container is based on a profile of Matroska. WebM initially supported VP8 video and Vorbis audio streams. In 2013 it was updated to accommodate VP9 video and Opus audio.