dtmf controller

Pjsip source code is relatively powerful. Let's talk about what DTMF is? Dual-Tone Multi-frequency DTMF (Dual Tone Multi frequency), dual-Tone Multi-frequency, composed of high frequency groups and low frequency groups, each of which contains four frequencies. A high-frequency signal and a low-frequency signal are combined to form a combined signal, representing a number. The

This item is the starting point for accurate identification of DTMF signals. After detecting this item, the DTMF decoder is triggered to decode the received data and wait until the corresponding dial key value is reached.1. analysis of input signal features: the signal is the circuit noise in the DTMF signal plus the channel. Now, preliminary analysis shows that

DTMF encoding transmitted by rfc2833 in Voice Transmission 2007-03-23 11:13:48 The class is defined as follows: # If! Defined (afx_head_2833_h000093b5c358_6f19_475b_a49f_13bfcc9dfe1c00000000ded _)# DefineAfx_head_2833_h000093b5c358_6f19_475b_a49f_13bfcc9dfe1c00000000ded _ # If _ msc_ver> 1000# Pragma once# Endif // _ msc_ver> 1000 Class chead_2833{Public:Bool dispelhead (char *Cvalue );Int btodd (char * cvalue );Char * dtob (intNvalue );Che

This article from csdn ucser, http://blog.csdn.net/perfectpdl reprinted to indicate the source, thank you! DTMF is called multi-tone dual-join, also called secondary dialing. There are three methods for VoIP to carry DTMF: inband, RFC 2833 (the latest RFC is 4733, which is referenced in IMS), and SIP info. The inband mode transfers the buffer generated by keys to the audio RTP stream, instead of definin

In the blog that introduces the four main objects, you can basically understand the process of program initiation:Main-->uiapplicationmain--> Create instances of UIApplication and app proxy appdelegate and set up proxy---> After the program starts, that is, after the splash screen is displayed, Appdelegate Create UIWindow (can be created automatically, or can be created manually)The question now is how to create a controller and set it as the root

Jump from the Controller on one item of tabBarController to the Controller on another item, and redirect mvc to another controller. First, from the habitual tabBarController, many application boxes start with this, and from the Controller on one item of tabBarController to the other, usually, you can directly switch by

The controller is part of the MVC pattern, an object that inherits the Yii\base\controller class, and is responsible for processing requests and generating responses. Specifically, the controller analyzes the request data and transmits it to the model, transmits the model results to the view, and finally generates the output response information from the applicat

AngularJS controller inherits from another controller, and angularjs controller inherits Controller inheritance in AngularJS, commonly used is the scope nested scope. By default, when an attribute cannot be found in the current scope, it will be searched in the parent scope. If it cannot be found until $ rootScope is

@{Layout = "~/views/shared/_layout.cshtml";}@using (Html.BeginForm ("Login", "login", FormMethod.Post)) {Password: @Html. TextBox ("password")}@Html. ActionLink ("Action-action", "Again", new {str = @TempData ["Name"]})@Html. ActionLink ("Controller-and controller", "Index", "Home", new {str = @TempData ["Name"]},null)MVC background to the foreground value, the same con