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Tag Archives: voxengine

Blind transfer support for SIP phones

A lot of traditional telephony services rely on this function. It lets callee transfer a call to another person by pressing special transfer button and entering another person’s number (usually extension number). It’s called blind transfer because the person who transfers the call won’t talk with the person to whom he transfers it.

Blind transfer
The following scheme describes the process in Voximplant terms:

Promise support has arrived to VoxEngine

JS PromiseNow developers can use Promise in their VoxEngine scenarios and we also added Net.httpRequestAsync and Net.sendMailAsync functions that return Promise object in addition to standard ones that used callbacks. We will be working on additional ES6/ES7 functionality in the future to help VoxImplant developers build apps and services even faster.

Microphone testing service


Many Skype users are familiar with its microphone testing service (echo123). When you call the testing service it asks you to say something and records the stream, then it plays it back and if you hear your voice it means that your audio recording device is configured correctly. You can implement similar scenario for your VoxImplant application by using the following VoxEngine scenario:

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Microphone activity event

Mic Activity

Measuring microphone activity can be useful in many cases. For example, in case of audio conference it lets developer highlight conference participant who is talking at the moment, or another useful scenario example – measuring call participant’s speech length. Now VoxImplant developers can detect microphone activity at VoxEngine scenarios level, we’ve implement new method for Call class – handleMicStatus , set handle to true and then use new CallEvents.MicStatusChange event to receive the information about microphone activity. Please check the usage example below:

  1. // Inbound call processing
  2. VoxEngine.addEventListener(AppEvents.CallAlerting, function(e) {
  3. var call = e.call;
  4. // Enable mic status tracking
  5. call.handleMicStatus(true);
  6. call.addEventListener(CallEvents.Connected, handleCallConnected);
  7. // Add event listener for mic activity events
  8. call.addEventListener(CallEvents.MicStatusChange, handleMicStatusChange);
  9. call.answer();
  10. });
  12. function handleMicStatusChange(e) {
  13. // Write mic activity info into log file
  14. Logger.write("Mic active: "+e.active);
  15. }
  17. function handleCallConnected(e) {
  18. Logger.write("Call connected");
  19. }

Audio conferencing

Audio Conference

Audio conferencing functionality offered by VoxImplant is one of the most advanced and flexible audio conferencing implementations you can find. Developers have full control of every call connected to the conference via VoxEngine. For example, it’s possible to record particular calls connected to the conference or the whole conference, developers can record only one audio stream that goes to the conference (if you need to get the audio from particular participant). It’s possible to play audio file (or TTS) into the conference or to particular participant (call connected to the conference), mute/unmute participants, and even join different conferences together. Our Web SDK lets developers create web client applications for the conference in minutes (WebRTC will be used Chrome/Firefox/Opera or Flash in IE/Safari), same with Mobile SDKs. It’s possible to implement convenient conference controls using messaging functionality (inside the call). In addition, SIP software and devices can be connected to the conference. It’s hard to imagine audio conferencing service you can’t build using VoxImplant. There are only few things we haven’t finished yet – wideband audio support and voice activity detection (both are being developed by our brilliant engineering team, so they should become available soon).

Introducing VoxImplant Cookbook

cookbookWe are going to make things easier for VoxImplant developers by providing ready-to-use VoxEngine scenarios, How To’s and screencasts. First scenarios including cloud pbx and simple callback are already available at https://github.com/voximplant/, in addition to README we will write “How To” for each scenario and post here. Feel free to fork, make your own scenarios and share them with the community!

Debugging VoxEngine scenarios

cloud_debugger_vpIt’s much easier to develop apps with the right tools. One of the important processes during any app development is debugging. Keeping in mind that call control logic is written in Javascript and usual web developers can build apps for VoxImplant, we decided to create convenient debugger to let developers debug their apps in real-time right in a web browser. We called it call control debugger and it’s now available at VoxImplant control panel.

High quality Text-to-Speech functionality is now available for all VoxImplant developers

Text-to-SpeechWe have finished the integration of TTS functionality with VoxEngine, now developers can specify text that will be converted into speech and sent to a call as an audio stream in 25 languages (for many of the languages you can choose between male and female voice). It will help developers build better cloud IVR, cloud contact center, cloud PBX, and other apps faster and automate a lot of standard interactions with a caller. To learn more about the function please check say function of the Call class and Language namespace in the VoxEngine Reference.

In the near future we will add ASR (automatic speech recognition) function to let developers transcribe call records to text and do real-time speech recognition if required. Let us know if you have any questions and stay tuned!


Recent Posts

Feb 13, 2017 10:22
Authorization using tokens instead of passwords
Feb 03, 2017 01:45
Push Notifications for Android
Feb 03, 2017 01:45
Push Notifications for iOS
Jan 19, 2017 08:38
Speech-to-text: ASR
Jan 19, 2017 08:38
Speech-to-text: transcribing
Jan 19, 2017 08:37
Audio Recording
Dec 28, 2016 12:47
VoIP Push Notifications support for iOS SDK has arrived
Dec 14, 2016 02:00
New billing for video calls running via servers
Dec 07, 2016 02:29
Blind transfer support for SIP phones
Dec 02, 2016 06:18
Step-by-step call center tutorial part 8