dtmf relay

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

Network (8) creates an azure Point-to-site point-to-site VPN　Two. Site-to-site VPN　　Connect your local network (site) to the Azure virtual Network (site) in the cloud.Site-to-site VPN Premise requirements:-Corporate local network requires a fixed public network IPV4 address-Requires a Microsoft-certified VPN device or Windows Server. RRASFor a list of devices, please refer to:https://msdn.microsoft.com/en-us/library/azure/jj156075.aspx-The VPN device must be in front of the NAT device　　Site-to-

On many occasions, you can configure the Cisco router to become a Frame relay switch. and supports multiple routers to form a larger frame relay switch via NNI connections. In this paper, R2 and R3 are interconnected to form a large switch to communicate R1 and R4. R2: No IP routing Frame-relay switching Interface serial1/0 Encapsulation Frame-

Error message:Mysql> show slave status \ G* *************************** 1. row ***************************Slave_IO_State: Waiting for master to send eventMaster_Host: IPMaster_User: replMaster_Port: 3306Connect_Retry: 30Master_Log_File: mysql-bin.xRead_Master_Log_Pos: pos_xRelay_Log_File: relay-bin.yRelay_Log_Pos: pos_yRelay_Master_Log_File: mysql-bin.zSlave_IO_Running: YesSlave_ SQL _Running: NoReplicate_Do_DB:Replicate_Ignore_DB:Replicate_Do_Table:R

Check the mysqlerr log today and find that the following logs will always appear during mysql restart: [Warning] Neither -- relay-lognor -- relay-log-indexwereused; Check the mysql err log today and find that the following logs will always appear during mysql restart: [Warning] Neither -- relay-log nor -- relay-log-ind

Tags: signal amplifier wireless router WiFi router Repeater650) This. length = 650; "Class =" alignnone wp-image-986 size-medium "src =" http://www.jyil.cn/wp-content/uploads/2014/11/u39690098591999925078fm23gp0-300x206.jpg "alt =" How do I re-set "Height =" 206 "width =" 300 "/>Many friends have poor signals in their homes and need to relay the Wi-Fi signal sent from the WiFi router. Many friends need to reset the repeater After configuring the repea

Q : What's the role of wireless relaying? How do I set it? A: Wireless relay, is the realization of wireless amplification, can be removed from the trouble of wired connection, convenient and beautiful. You might consider setting up a wireless relay in the following situations: Already has a router, also needs to use another router to do two level route, but does not want to connect t

Understand and take: How frame-relay works Corresponding Teaching Video in: http://edu.51cto.com/lecturer/user_id-7648423.html 9.9 release, which can be viewed after the Administrator's 24-hour review. The course name is Cisco CCNA-certified Frame Relay analysis 200-120) 9 lessons. Frame Relay (Frame Relay) is an in

Frame Relay) is a group-oriented communication method used to connect to computer systems. It is mainly used for LAN interconnection and WAN connection on public or private networks. Most public telecommunications bureaus provide the Frame Relay Service as a way to establish a high-performance Virtual wide-area connection. Frame relay is a user interface that ent

DHCP Relay Configuration 25.1 Overview 25.1.1 understand DHCP DHCP protocols are widely used to dynamically allocate reusable network resources, such as IP addresses. DHCP client issues DHCP Discover broadcast messages to DHCP Server. After DHCP server receives the DHCP discover message, it assigns resources to client, such as IP address, and sends DHCP offer message according to certain policies. After the DHCP client receives a DHCP off

WAN connection has many implementation technologies, such as integrated business digital networks and point-to-point protocols. Frame Relay is undoubtedly the most ideal WAN technology for remote connection so far. Frame Relay defines the process of sending data on the public data network, which is suspected of being a high-performance data link layer. It mainly works on the OSI reference model and data lin

This experiment is to configure a general router as a frame relay switch to provide a frame relay experimental environment for other experiments in this chapter.1. Tutorial PurposeThrough this experiment, you can master the following skills:● Configure a frame relay environment with only two nodes;● Configure a star frame rel