voip

I'm using the SIP stack in Android 2.3.4 and everything is working nicely. However, I need the system to use SSL, and have created the following code: SipProfile.Builder builder = new SipProfile.Builder("user","domain"); builder.setPassword("password"); builder.setOutboundProxy("sip:IPADDRESS:5061;transport=tls"); builder.setProtocol("TCP"); builder.setAutoRegistration(true); me = builder.build(); Intent i = new Intent(); i.setAction(Constants.INCOMING_CALL_INTENT); PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, Intent.FILL_IN_DATA); manager.open(me, pi, registrationListener);

VoIP基本原理 VoIP是通过Internet等互联网络传递语音信息的，主要包括终端设备、网关、网守和网络管理等部分。网关负责提供IP网络和传统的 PSTN 接口。 VoIP的基本原理：通过语音压缩算法对语音数据进行压缩编码处理，然后将语音数据按照 TCP/IP 标准打包，经过 IP 网络把数据包发送到接收端，之后将语音数据包串起来，经过解码解压之后，恢复成原来的语音信号，从而达到利用互联网传送语音的目的。与之相似的有公共交换电话网络(Public Swithched Telephone Network, PSTN )：这是一种日常生活中经常使用的电话网。由于PSTN是一种电路交换的方式，所以一条通路自建立直至释放，其全部带宽仅能被通路两端的设备使用，因此带宽利用率极低。 VoIP的核心与关键设备是IP网关。网关具有路由管理功能，它把各地区电话区号映射为相应的地区网关IP地址。这些信息存放在一个数据库中，数据接续处理软件将完成呼叫处理、数字语音打包、路由管理等功能。在用户拨打长途电话时，网关根据电话区号数据库资料，确定相应网关的IP地址，并将此IP地址加入IP数据包中，同时选择最佳路由以减少传输时延，IP数据包经Internet到达目的地的网关，在一些Internet尚未延伸到或暂时未设立网关的地区，可设置路由，由最近的网关经过长途电话网转接，实现通信业务。

Does anyone know how to use Android device's built-in acoustic echo cancellation? It is located somewhere in silicon and is used for GSM/CDMA speakerphone calls. We'd really like to tap into it for a VoIP application instead of rolling our own. Ben I was finally able to get echo cancellation to work on my Arm5 (WM8650) processor (Android 2.2). Below are the steps I took. I wrapped Speex with JNI and called echo processing routines before sending PCM frames to encoder. No echo was canceled no matter what Speex settings I tried. Because Speex is very sensitive to delay between playback and echo

I need my VoIP App to auto start after rebooting the device. Apple docs clearly mention that :- (=========EDIT: This is from official Apple docs please have a look at this before commenting or answering that the App cannot be launched without user interaction or silent push notification. Also have a look at Github project below, people have verified this behaviour) Values for the UIBackgroundModes array Value : voip Description : The app provides Voice-over-IP services. Apps with this key are automatically launched after system boot so that the app can reestablish VoIP services. Apps with this