Users of TM voice communication services can use at least telephone sets with touch-tone dialing capabilities as subscriber terminals.

Depending on the mode of information transmission, TM voice communication services are divided into:

CLASSIFICATION OF VOICE SERVICES

Voice services

The provision of voice communication services is the provision of local telephone services with the allocation of local phone number with the ability to access long-distance and international telephone services. This number allows you to service several calls simultaneously, the number of which is determined by the number of telephone lines.

Additional services: abbreviated dialing under subscriber control, direct call with delay, call redirection (to any number, when the called subscriber is busy, when the called subscriber does not answer), restriction of outgoing calls under subscriber control, temporary barring of all incoming calls, call hold, notification of a new call, conference call, voice mail and etc.

Voice communication via IP telephony

IP telephony is a technology that provides voice communications over data networks. In other words, IP telephony allows you to carry out international and long-distance conversations in real time via the Internet or any other IP network. Thanks to this technology, contact is established between many disparate objects. Communicating with remote objects using the classic method is usually expensive. Communication via IP telephony is a significant saving in the costs spent on negotiations, since the functions of voice communication and data transmission are combined into one network.

IP telephony allows you to organize telephone communication or sending a fax message using the Internet, local network, dedicated channel. The advantages of IP telephony are the economical use of channel capacity, which can significantly reduce the cost of a call and thereby reduce the cost of negotiations with international and long-distance objects.

Operating principle of IP telephony

The operating principle of IP telephony is extremely simple. When you talk, your voice is digitized and converted into digital data packets, and this information is then sent over the Internet to the other end of the line. The other side, having received these packets, performs the reverse procedure, decodes the signals and converts them into a voice that your interlocutor hears.

Types of IP telephony

Conversation methods can be divided into several types.

• Computer-Phone - with this method, subscribers need to have a computer with sound card and speakers or headphones and a microphone connected to it (an IP phone can also be used) and on the other hand the most regular phone connected to a telephone line.
• Telephone - Telephone - with this method, one of the subscribers will have to use one of the many companies providing IP telephony services, and on the other hand, the most ordinary telephone connected to a telephone line.
• Computer-Computer - with this method, subscribers need to have a computer on both sides with a sound card and speakers or headphones connected to it and a microphone (an IP phone can also be used). This is the simplest and cheap way Internet telephony, because the costs of both interlocutors are reduced to the cost of their Internet connection.

Advantages of IP telephony

The advantages of IP telephony undoubtedly include its low cost, reliability, high communication speed and ease of use. IP telephony is currently in a real way communications and in the foreseeable future will be as commonplace as landline phone for a modern person.

Does it ever happen that you can’t receive a call because you didn’t hear it, you can’t pick up the phone, or you don’t have the phone at all? And if they call with serious information, do they want to make you an attractive business offer or warn you about something? If such cases happen in your life, then you should think about what voicemail is in a mobile device and how to activate such a service.

Voicemail: connection and activation

First you need to purchase the mobile device itself, select Nokia phone You can follow the link http://shop.mts.by/phones/nokia. Next, you need to activate and connect the service itself. There is usually no charge for activation, listening to and downloading messages is also free, only subscription fee is consumed evenly throughout the month. To connect, you must take into account your tariff and telecom operator. It’s better to either simply contact the center in person to connect, or dial a special number from your mobile phone. service number and consult the operator. The operator will guide you to current tariffs, will instruct you about connecting and send you voicemail settings.

How voicemail works

During a call, the subscriber is waiting for your answer. When using voice mail, a certain timer is set until the service is activated on the phone. As soon as the caller has waited this time (30-40 seconds), he will hear a signal saying that “the subscriber, unfortunately, is in currently cannot answer your call. Please leave a message after sound signal". And then you can provide all the necessary information, and then just hang up. Calling voicemail is assessed in the same way as an ordinary call.

The receiving party will immediately receive a message signal after the call. You can listen to it immediately or a little later when it appears. free time, and only then decide whether it’s worth calling back. Voice messages You can save them on your phone and listen to them as often as you need. Fee per audition voice box not charged. The message will not randomly reach anyone other than the intended subscriber. So if you decide to buy a Prestigio or any other phone, you can be absolutely sure of the complete confidentiality of the information received or transmitted and not worry about whether it’s good or bad - voice mail in mobile phone.

In modern times, all phones are smart, they are called smartphones. If we talk about the phone, then this is an unusual device. Almost one hundred percent, a smartphone is a computer with high performance, a serious processor, a colorful screen, and a touch screen that turn the device into a fashionable gaming and multimedia center. At the forefront is an excellent data transfer speed and a huge range of interfaces. As a result, the main function of a smartphone - voice communication - is lost in such diversity. Some may even ask if there is room for it. Experts say that voice communication will disappear, and mobile operators will only provide data service.
When the 3G standard appeared, some began to predict that the GSM network would die. This was associated with the growing use of data transfer services, as well as the emergence of high-speed technologies. 4G appeared here; equipment and protocols for voice communication were not even provided here. But the situation should be looked at not from the side of the enormous pace of technology development, but from the side of the material component in the earnings of mobile operators and the need for a standard service. Even with high speeds, people still need voice service. Operators receive about 90% of their revenue from voice communications. Naturally, no one will refuse this service. Some assumed that the 2G standard would die, but it did not. All global operators continue to develop GSM networks. In 2G they only reduced some of the voice communication, but did not abandon it. GSM communications are relevant for subscribers who live in small towns and villages. After all, wired communications are not available everywhere, but with the help of a mobile phone a person can make calls over a large area.
This is where contradictions arise. Data transmission dimensions are growing dramatically. All information exchange and social activity is located on the Internet. Smartphones are equipped with excellent screens and cameras, and they can become substitutes for voice communication. But we must remember that no one has yet canceled a person’s feelings. Communication through speech is the main method for exchanging information. Communication becomes personal, personal qualities are introduced, and emotional coloring is given. But it’s impossible to express all this in text or video. Accordingly, you should not expect another smartphone to appear without voice communication.
The developers of LTE were convinced that there was no need for voice communications. These were the initiators of the improvement, which consisted of the VoLTE add-on. This device should have been added to the finished circuit. But when everyone was ready to implement improvements to the 4G network, then mobile operators Still, we couldn’t refuse voice communication. After all, this is the main source of their profit.
Even earlier, they predicted that the messages would go away, but years pass, and the messages remain relevant. If you imagine that financial institutions will stop sending messages about financial transactions and will stop receiving notifications about topping up your mobile phone account, then this is a real nightmare. These are familiar moments, they have really taken root among people, so it’s too early to talk about refusing messages.

It's no secret that one of the important factors victory is Voice connection , which allows you to intelligently adjust team interaction.
We present to your attention the 3 most popular programs that allow you to implement this function.

Mumble

Free, cross-platform VoIP application with open source. Includes a special technology (“Sound Positioning”) that allows you to make the sound of other players’ voices dependent on their specific location in the game.

What is Mumble?
It is an open source voice conferencing client.
What is Murmur?
This is a Mumble voice chat server for users to communicate online.
Why is it better than Ventrilo or Teamspeak3?
Ventrilo server is commercial and not available to ordinary users. It is almost impossible to install a server on your host. You can only rent a server from Ventrilo representatives.
Teamspeak3 is also commercial. Free version has a limit on a certain number of slots. The quality of communication leaves much to be desired.

Raidcall

A computer program designed specifically for voice communication via VoIP technology. Programs of this type are most often used by gamers, but can be used anywhere where you need to maintain voice communication or coordinate the actions of a certain group of people. Created on the modern Speex audio engine, which allows you to effectively reduce echo (noise) and improve the quality of the transmitted/received signal.
Raidcall is more or less similar in functionality to programs such as (Skype, TeamSpeak, Ventrilo). There are a number of both pros and cons.
In 2011, two well-known gaming teams Fnatic and SK Gaming, for which Raidcall became a sponsor, acted as a guarantee that the software is a quality product.

TeamSpeak 3

A computer program designed for voice communication on the Internet using VoIP technology. It differs from a classic telephone in its almost unlimited number of subscribers talking simultaneously. Most of all, it is similar to a multi-channel walkie-talkie, in which you can use several channels simultaneously. At the same time, all options that were previously developed for the convenience of using walkie-talkies in field (combat) conditions are available. Programs of this type are intended primarily for gamers, but can be used anywhere where voice communication and coordination of a large group of people is necessary.
It is worth noting that such services can be implemented within the gaming applications themselves, where communication between participants and coordination of actions are essential for gameplay. There are programs with a similar set of functions, such as Ventrilo, Skype, Roger Wilco, Mumble, TeamTalk. and TeamSpeak are the most popular programs among computer users

High quality of data exchange, including voice, in wireless networks implies, first of all, stability and high speed of information transfer. Work to improve the quality of mobile networks is ongoing and it should be noted that over the past few years a lot of success has been achieved in this area. Newer and more advanced communication standards are becoming available, for example, Long Term Evolution or LTE for short. This standard is also known as 4G.

According to the specification, the maximum speed that 3G networks can provide is 42 Mb/s, but in reality it rarely exceeds 2-3 Mb/s, while the fourth generation network already allows data transfer at speeds of about 20 Mb/s, a clear example what is the Moscow LTE network Megafon. LTE/4G is also good because it is fully compatible with 3G based on UMTS/HSPA and CDMA, which allows its implementation without significant infrastructure reconstruction. But LTE also has its drawbacks, of which perhaps the main one is the lack of support for telephone voice communications.

VoLTE – what is it and how does it work?

To make calls, the user can switch to 3G, but this is not an option. Instead of returning to outdated standards, it is better to use a new technology called VoLTE. But what is VoLTE? The closest analogy to this new standard is Skype. In VoLTE, as in Skype, voice is transmitted not over switch channels, but over the Internet. In short, VoLTE is a voice transmission technology over an LTE network that allows you to make calls at high speed, while taking advantage of all the benefits that the fourth generation network provides.

But that's not all. Previously, when making a voice call, the operator transferred the subscriber from LTE mode to 2G or 3G using the widely used Circuit-Switched Fallback (CSFB) technology.

When the user ended the call, their phone automatically switched to LTE. This time-tested method, however, has a number of disadvantages. In particular, the use of CSFB created unnecessary load on the mobile network, and also increased the connection time between the user and the subscriber, although neither the caller nor the recipient of the call, as a rule, noticed this. With LTE everything is much faster and simpler, because now calls are made within the network itself.

Advantages and disadvantages of the standard

Although VoLTE technology is still in its development stage at the moment, its advantages are quite obvious. These include:

• Higher connection speeds achieved by eliminating the need to switch your mobile device to GSM or 3G when making a call.
• More high quality vote. The data transmission speed in 2G and 3G networks is limited, which does not allow the transmission of voice modulation components in full. Bandwidth LTE is much higher, more voice data is transmitted through such a network, and the use of HD Voice codecs gives volume to the sound and reduces the amount of noise.
• With VoLTE, simultaneous transmission of voice and other data is possible. In 2G and 3G networks, when making calls, the transmission of Internet traffic was usually temporarily suspended. This is due to the fact that with the simultaneous transmission of voice and other data, the quality of communication sharply decreased, while the load on the network, on the contrary, increased. VoLTE does not have these restrictions.
• Increasing capacity cellular networks. The use of VoLTE technology allows you to increase the number of simultaneously using communications subscribers up to three times compared to 3G without significantly increasing the load on the network.
• Free calls. Since voice is transmitted in packet mode when using VoLTE, only Internet traffic is consumed. If the user is connected to unlimited tariff, all calls he makes can be considered practically free.
• Save battery power. The VoLTE standard provides a special DRX mode that ensures signal reception base station with short breaks. During such breaks, the device's radio is turned off, therefore, battery consumption is reduced.

These were the main advantages of VoLTE. On the other hand, it has its own number of disadvantages, due to which users often refuse new technology. At the moment, the main disadvantages include:

• Increased demands on the hardware resources of a mobile phone. The VoLTE operating algorithm must be implemented at the processor level; if the requirements do not meet, the load on the mobile device may increase.
• Limited number of phone models supporting VoLTE. New technology is supported only by the most latest models mobile devices.
• To ensure the stated sound quality, VoLTE must be used by both the caller and the recipient of the call.
• Difficulties in transition to a new standard by operators mobile communications. It will be possible to take advantage of VoLTE only after all operators decide to make the standard the main one.
• VoLTE is not supported by all operators or in all regions due to the lack of appropriate equipment on the towers.
• Vulnerabilities in VoLTE technology.
• The standard may not be available in intranet and international roaming.

How to enable VoLTE on your phone

The use of the new standard is possible subject to two main conditions. Firstly, your operator must support it, and secondly, the standard must be supported by itself mobile device. Everything is more or less clear with the operator; to find out whether it supports the new standard or not, just call the support service. Now let's see what VoLTE is in a phone. This is an option that can be enabled manually or automatically in the mobile settings. If your phone does not have this option, VoLTE is not supported either by the firmware or the device.

Currently, VoLTE is supported by more than thirty smartphone models from leading manufacturers. Among them are iPhone, LG, Vertex Saturn, Samsung Galaxy, Sony Xperia and ZTE. How to enable/disable VoLTE? It all depends on the device model. On the iPhone, for example, the VoLTE standard is enabled in the settings cellular– Data settings – Enable LTE – Voice and data.

To enable the option in Samsung Galaxy, you need to follow the chain Settings – Connections – Mobile networks– VoLTE calls. In LG smartphones you need to go to Settings, and then follow the path Networks – Advanced – Mobile networks – VoLTE. VoLTE is disabled in the same place where it was enabled.

Development prospects

Despite the many difficulties and obstacles faced in the implementation of VoLTE, the future of the new technology seems very promising, especially considering that the advent of 5G networks is just around the corner. The main obstacle to the development of the standard - the lack of an appropriate legal framework in Russian legislation - has already been successfully eliminated, and now the matter is up to the leading mobile operators, as well as the users themselves.

However, one should not expect rapid spread of VoLTE, especially in the regions. There are still too few devices in the hands of cellular network subscribers that can work with this technology; secondly, there is still no complete and final agreement between operators regarding the transition to a single standard. The victory of VoLTE can only be expected if uniform principles are created and adopted by all operators, and also provided that the standard manages to withstand competition with services providing OTT voice services.