Voximplant. Blog

Authorization using tokens instead of passwords

Storing and saving passwords inside applications is not safe. For better security our SDK provides two additional login methods: with the one-time login keys and with the renewable tokens. Keys omits the need to store passwords entirely by using your own backend that will generate a one-time login key each time your application needs to login the Voximplant cloud. Although very secure, the keys require your own backend to be created, while the “tokens” can be used entirely on the SDK side with some security and usability trade-offs that are explained in this article.

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Push Notifications for Android

VoxImplant push notifications for Android are based on FirebaseCloud Messaging (FCM) platform and implemented as the “data messages”. Using notifications, a device can be awakened and an app started before a call arrives. Our SDK requires Android API 16 (4.1), while push notifications support also requires Play Services 10.0.1 or higher to be available on the device. Our Android SDK contains a sample application with all the code needed to handle push notification. Following tutorial explains that code and describes additional steps that should be performed to have a working Push Notifications solution for your mobile applications.

Push notifications are available since Android SDK version 2.1.0

Push Notifications for iOS

VoxImplant push notifications for iOS are based on the Apple VoIP Push Notifications. Using notifications, a device can be awakened up and an app started before a call arrives. Our iOS SDK contains a sample application with all the code needed to handle push notification. Following tutorial explains that code and describes additional steps that should be performed to have a working Push Notifications solution for your mobile applications.

Push notifications are available since Android SDK version 1.1.0

Speech-to-text: ASR

Unlike transcription that is performed after call ends, ASR (automatic speech recognition) works during a call and allows either to recognize a word among given variants or do a “freeform” recognition of an arbitrary speech.

Speech-to-text: transcription

Transcription works just like Audio Recording with only difference that a text file is created alongside an audio file.

Audio Recording

Voximplant cloud scenario allows to record audio, video and transcribe voice-to-text for each individual call object. Recorded audio, video or text is stored at Voximplant cloud for 3 months, after that it’s automatically deleted. Recordings can be downloaded if longer storage is required.

VoIP Push Notifications support for iOS SDK has arrived

Dear Voximplant developers, we are happy to announce that Voximplant now supports VoIP Push Notifications for calls to iOS SDK. We tried to make everything as simple for developer as possible; the following steps are required to enable VoIP Push Notifications for your app:

1. Upload your Apple VoIP Push certificate at https://manage.voximplant.com/#certificates and specify (bind) Voximplant application(s) where you will be using VoIP Push functionality

2. Add

require(Modules.PushService);

in the beginning of your VoxEngine scenario

3. Now VoxEngine’s callUser and callUserDirect functions will start using VoIP Pushes to notify the SDK about incoming calls. (same applies to helper functions: forwardCallToUser and forwardCallToUserDirect)

4. Get new version of iOS SDK at http://voximplant.com/docs/references/mobilesdk/ios/

That’s it!

P.S. Android Push support is on its way to production, expect it right after the New Year in January 2017!

New billing for video calls running via servers

We are happy to announce that currently video calls that go via Voximplant servers (not P2P ones) are billed per megabyte of video traffic. Since the resolution of a video stream can be different (so as fps, video codec and other params) it means that per minute billing was a bad idea for this case – 1 minute of video call generates different load on our infrastructure depending on various parameters. So now the formula for video call going via Voximplant servers looks as follows:

SDK-platform / platform-SDK call – $0.002 per minute per call leg
+ $0.001 per megabyte of video traffic sent to the platform

See http://voximplant.com/pricing/ for the details

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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:

Step-by-step call center tutorial part 8

Call lists, PDS and SIP

There are two ways how Voximplant can handle an outgoing call. First, the outgoing call can be initiated from JavaScript session created from the incoming call. That approach is used if you want to connect two or more people, forward call into a call center or implement any other “connect two persons” logic where and outgoing call is initiated as a response to the incoming call. Second, you can initiate outgoing call via the HTTP API. That approach is used if you want to initiate a call from your service or call multiple users. You can implement any call logic via HTTP API, but you also need to setup your own backend that will initiate calls, maintain the suitable number of simultaneous calls etc. For fast “out-of-the-box” experience we have a built-in “Call list” functionality that allows calling thousands of users with a few commands and without any backend of your own.

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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: transcription
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

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