IP network telephony differs from VoIP network telephony

Compared to building intercom, Internet telephony can be said to have been in our lives for a short time.

Generally speaking, network telephony refers to IP as the network layer protocol of the computer network voice communication system, it uses the technology collectively referred to as VoIP (Voiceover IP), that is, the use of the network to achieve voice transmission. From the technical point of view, IP network telephony is the result of integration of two main technologies, which is the network grouping with IP as the symbol and multimedia as the goal.

With the improvement of network construction, the network environment has been upgraded. The boundaries between computers and telecommunications have also been gradually broken. Therefore, the network telephone is also in this kind of fusion birth.

But for the network videophone, it has the low price, the flexible service, as well as facilitates the enterprise internal contact characteristic. At the same time for the integration of new technologies also has a great help. But in the network call, its speech processing aspect mainly solves two questions, namely maintains the call quality the premise to reduce the coding bit rate as far as possible. Another is in the IP network environment to ensure a certain quality of calls. And the introduction of video link, is a kind of guarantee the audio transmission based on a technology attached.

Although the same with the use of IP network to achieve video transmission work. But they are a little bit different. IP visual intercom is also known as full digital intercom, it is in the original bus-type visual intercom system based on the evolution of digital products.

The IP visual intercom system uses the latest digital audio and video compression, DSP, embedded and streaming media network transmission technology, combined with the characteristics of Home Intelligent Gateway system, using the local area network, audio and video network transmission, in addition to video transmission, it can also complete the alarm, access control, and the work effect of intelligent home appliance control.

From the above analysis, we can see that although they have a small difference in some functions, but they can meet our different end of the video communication search. So, does this commonality mean that they can achieve simpler integration? Let's do a simple analysis here.

Differences in communication patterns

Despite its very close function. But in the way they are implemented, their differences are really small. For VoIP, its communication process is mainly based on computers and computers, telephones and telephones, or between computers and network telephones. and the network visual intercom mainly exists in the doorway with each extension, or management center and indoor extension and some special regional security management system. Although the same as video communications, but their service terminals are very distinct, this is in the specific use of technology, brought more different direction of emphasis.

Differences in transmission paths

In addition to the terminal difference, the signal in the transmission path, there is no small difference. For IP network telephony, it pays more attention to the voice communication between the network devices, while the visual intercom pays more attention to the control signal transmission between the LAN. Therefore, if you want to use the network videophone for the signal control of the device, its limitations on the type of signal transmission is very strong.

Differences in audio and video quality

In the audio and video transmission process, the network videophone consider more is the influence of bandwidth. Because of the different network environment, so this transmission is based on audio and video quality and network transmission environment for the necessary trade-offs. Therefore, under such demand, the high compression becomes the essential processing link of the network videophone. However, a high proportion of compression will inevitably lead to a decline in audio and video quality. Therefore, if you want to maintain high quality audio and video effect on the network videophone, from the current technology is still very difficult.

And because of the visual intercom in the transmission, because the use of audio and video one-way, so in the LAN transmission, the quality of video will be so much better. However, due to the lack of echoes in the problem of the phone-like processing equipment. Therefore, in sound quality, the disturbance caused by the echo is very difficult.

Differences in usage requirements

In addition to the technical factors caused by the difference, the user of the network phone and visual intercom is also very large. For network telephony, users pay more attention to the transmission ability of audio and video in the application. More accurately, it should be the transmission capability of audio, that is, the biggest role of network telephony is to provide users with a bridge to communicate.

And for the visual intercom, it is more a kind of security management and communication communications. For example, the front door access control system, cell radio transceiver, security system alarm and so on. And for network telephony work relatively low quality of the picture, to a certain extent, is also an intolerable security application.

From the above analysis, we can see that both the technical and application requirements, the visual intercom and the difference between the telephone network is very large.

However, due to the huge cost difference between network telephony and network visual intercom, therefore, many manufacturers have made the network telephony technology almost unchanged transplant to the application of visual intercom, although such changes in the cost savings have a great deal of innovation, but the side effects of security work is huge, Even sometimes in the use of a kind of "farfetched" feeling.