Build protocol usage in VoIP

In VoIP, protocol usage is crucial. It is not only because it can effectively manage the network, but also because it directly affects the use of VoIP. In special circumstances, the VoIP network can be connected to the transmission telephone network. However, this is certainly not a standard practice. In other words, you may not be able to call people who are using traditional phones. Although there are various applications available on the market-including free software and proprietary software, however, calling over the Internet has some major disadvantages. The most obvious difference is that the system is unstable and the transmission speed is slow, so there may be a lot of noise on the connection line, although some service providers have taken some preventive measures, they cannot guarantee that you can connect to the party that requires the call. Or even worse, people have not yet agreed on the number allocation standard, just as the E.164 standard we use to allocate and recognize traditional fixed and mobile phone numbers ｡

Even if some integration is achieved between VoIP and traditional telephone networks, this is still different for mobile networks. The main problem is that wireless networks are not as widely covered as mobile networks, if you use a mobile phone to access the Internet, you still have to worry about the cost. For me, this means that every KB of traffic is used, the cost is equivalent to 0.50 euros. The third-generation telephone network is integrated with VoIP, which is expected to ease these questions ｡

In addition, you should also note that there is no encryption mechanism for VoIP. Therefore, it is easy for anyone to intercept the call content. Therefore, although VoIP is useful, it cannot replace fixed phone (at least for the time being )｡

Build a VoIP Server

Some well-known providers provide services free of charge, while some businesses that need to pay for them. The free services include SIPphone, Skype, SIP Broker, and Google. However, most of the free services do not allow you to connect to the traditional telephone network. The so-called Full telephone service is usually not free. The most well-known full telephone service providers include: vo-nage, Lingo, AOL TotalTalk, and SIPphone ｡

Of course, here are just a few examples, because new local and global providers are joining in almost every day. In addition, many small and medium enterprises are also building VoIP networks in the company, if you want to build your own VoIP network, you may need to consider using the Asterisk server software or sipX, which is an open-source PBX implementation solution ｡

In addition, if you want to only use a soft phone, it means that your computer needs audio systems (speakers, microphones, or headphones) and related software, consider Ekiga on the GnomeMeeting blog (formerly GnomeMeeting). Although Ekiga supports a large number of hardware, it usually needs to be configured, in order to support video conferencing features at the software level. Like sipX and asteri­ sk, Ekiga is also open source software ｡

Note: PBX represents a proprietary small telephone switch, which can centrally manage all telephones of a company ｡

Client

The client depends on the network architecture. Some applications may run better than other applications, this is due to the Protocols they use. Most standard-based solutions use H.323 or session initialization protocols (SIP). In addition to these two standards, there are also many proprietary protocols, for example, Skype from Skype and Cisco thin client Control Protocol (SCCP). The main difference between them is that SIP saves the IP address of the client in the VoIP software package, therefore, if you are behind the firewall, you will encounter difficulties ｡

Microsoft NetMeeting and GnomeMeeting use H.323, Microsoft's Messenger, Apple's iChat and SIPphone use SIP. server software usually uses several different protocols ｡

In addition to the network architecture, available bandwidth may also be a limiting factor, because some application software has been optimized for low bandwidth, some applications are used for broadband connections. This depends on which codecs are used by the VoIP system to process the sound ｡

For the client hardware, use headphones. Although PCs, especially portable computers, may have built-in microphones and speakers, the performance will be much better if you use headphones, because it can suppress echo and noise from the surrounding environment, if you can choose, select USB headphones. USB headphones are audio devices independent of the system, it works independently of existing audio hardware, so it avoids any burst between VoIP and normal sound processing ｡

Audio System

Before using the VoIP application software, you may have to perform some experiments to find the most suitable settings. Make sure that you can record and play your own sound samples before you start, because the VoIP program also uses the hardware recording function, it can be activated in the volume control program that comes with the release version ｡

In general, it feels quite good to use. Although open source code programs: KPhone and GnomeMeeting are a little more difficult to use, because they need to know URL and other content, however, it is easier to get the documentation description of the required content and to directly obtain the instructions from the program developer, instead of simply serving the general help page or some of the skills provided by the user ｡

For Skype and X-Lite, you need to connect to the server. GnomeMeeting and KPhone can be used directly on different clients even if they are not registered on the server, whether GnomeMeeting or KPhone is installed on your own network or on an external network, we don't trust Skype, their services will still be free of charge, but they are not mentioned for the software. because it uses proprietary protocols and documentation instructions are not detailed enough, users may be firmly bound by this vendor, I will insist on using gnomemeeti­ ng. Why? Because we tried it for the first time, it can be used normally, and its performance is stable, and it can also implement the features it promised ｡