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How to add custom media codec to pjsip

How to add custom media codec to pjsip Hi, in this post, I will show you how to add a custom codec to pjsip 2.2.1 Introduction: http://www.pjsip.org pjsip is a very strong and widely use in voip. you can combine pjsip with kamailio, stund, turn server, freeswitch to build chat application like Skype with many well feature like message, call, conversation.v.v. http://www.opus-codec.org opus is a lightweight media codec with very good quality but also cost minimum bandwidth (you can customize it bitrate yourself) to port opus codec you should choose a codec and follow it config (gsm for example) (This tutorial I read from http://www.piemontewireless.net/ , but now, this link is no longer exist) A little bit you need to know about pjsip build system (make file) pjsip use a set of make files to build, if you familiar with gnumake, it’s very easy to understand pjsip. but if you are not, here are some tips to help you easily maintain pjsip and solved bug when buid notice abou
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Level up your log in React-Native with Reactotron

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A Log - Many Logs Log is the essential part of programming. If you ever worked with mobile programming or react-native, you will find that log is a the essential for monitor your app. In this post, I just want to a share a little bit trick to log in react-native app :) Console.log is bad!!! React-Native come with the default console.log to be able to see the log messages. You have to turn on Debug JS Remotely and open Inspector in chrome to view the message. This is bad because Debug mode is very slow. If you write a long message, it can crash your app The app continues warning about keeping chrome on foreground Reactotron come to rescue!!! https://github.com/infinitered/reactotron Yes!!! with reactotron, you DON’T NEED to turn-on Debug JS to be able to see log, and the log is also FASTER btw. The example below show how to configure Reactotron with redux for simulator and real device import Reactotron from 'reactotron-react-native'; import { reactotronRedux }
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iOS Push Notification with HTTP2

Setup iOS APNS with HTTP/2 Overview: There're one issue while sending iOS notification to multiple devices with old method (send by ftp write stream). Let say you send to 100 devices, ftp write work likes this: 1. connect to APNS Server 2. for each device: send notification by using device_token & payload 3. disconnect In step 2, if there're 1 invalid token (there're many reason make a token invalid: expired, wrong cert, wrong format...etc) the connection will be block without status from APNS Server, if you want to check the status, you have to wait at least 0.5s-1s and using ftp-read to read the status. It's mean you have to check status after every ftp-write and re-connect again if there're an invalid token.  So, to send to 100 devices, you need 50 seconds, that's too long. At WWDC 2015, Apple has introduce a  new notification api by using HTTP/2 This api allow you to send notification as a post request or curl and get the result
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