Benefit and Weakness of VOIP (Voice Over Internet Protocol)

Voice over Internet Protocol (also called VoIP, IP Telephony, Internet telephony or Digital Phone) is a technology that allows remote voice conversation through internet media. Voice data is converted to digital code and streamed through networks that transmit data packets, and not through ordinary telephone analog circuits.

The definition of VoIP is the voice sent via the internet protocol (IP).

Protocol

Voice over IP has been implemented in various ways using proprietary rights and open standards and protocols. Examples of network protocols used to implement VoIP include:

H.323

Media Gateway Control Protocol (MGCP)

Session Initiation Protocol (SIP)

Real-time Transport Protocol (RTP)

Session Description Protocol (SDP)

Inter-Asterisk eXchange (IAX)

The H.323 protocol is one of the VoIP protocols whose application is found widely for long-distance traffic, such as Local Area Network (LAN) services. However, due to new developments, more complex protocols such as MGCP and SIP, H.323 deployment is increasingly limited to carrying long-distance existing network traffic. In particular, the Session Initiation Protocol (SIP) has gained wide VoIP market penetration.

An important proprietary implementation is the Skype protocol, which is based in part on the principles of peer-to-peer (P2P) networks.

Comparison with conventional voice networks

The simplest form in a VoIP system is two computers connected to the internet. The basic conditions for holding a VoIP connection are computers that are connected to the internet, have a sound card connected to the speaker and microphone. With the support of special software, both computer users can connect to each other in a VoIP connection with each other.

The form of the relationship can be in the form of exchanging files, sounds, images. The main emphasis for VoIP is the relationship between the two in the form of voice. If both locations are connected with a considerable distance (between cities, between countries), then it can be seen from the cost advantages. Both parties only have to pay the internet credit fee, which is usually cheaper than telephone credit charges.

In its development, VoIP connection systems have evolved. The form of equipment also develops, not only in the form of interconnected computers, but other equipment such as ordinary telephone sets connected with VoIP networks. Digital data networks with gateways for VoIP allow connecting to PABX or traditional telephone analog networks. Communication between computers and planes in the office is possible. This form of communication is not just sound. Can be in the form of writing (chat) or if the network is large enough can be used for Video Conference. In a further form this communication is better known as IP Telephony which is a form of multimedia communication as a continuation of the form of voice communication (VoIP). Flexibility of VoIP in the form of networks, equipment and communication media makes VoIP quickly popular in the general public.

Especially for VoIP the primitive form of the network is PC to PC. By using a PC with a soundcard and connected to the network, VoIP activities can be done. The next development is the incorporation of PABX networks with VoIP networks. VoIP gateway is needed here. The picture is the other person using a computer to contact an office that has a VoIP gateway. Further development of this configuration is in the form of PABX merging between two locations using a VoIP network. Not too concerned about the form of the network while using the TCP / IP protocol, the two locations can be interconnected. The most complex is a form of network that uses all the possibilities that exist with various forms of available networks. It takes a little extra expertise for complex network forms like that.

VoIP application and security

One of the VoIP applications available is Skype. Skype is a "software" IP-based voice communication application over the internet between Skype users. When using Skype, Skype users who are online will search for other Skype users and then start building networks to find other users. Skype has a variety of features that can make it easier for users. Skype is also equipped with SkypeOut and SkypeIn which allows Skype users to connect with conventional and mobile phone users.



Skype uses the HTTP protocol to communicate with Skype servers to authenticate usernames / passwords and register with the Skype server directory. A modified version of the HTTP protocol is used to communicate with fellow Skype clients. The advantage of this application is the availability of security services in the transmission of data in the form of sound. The security services provided are as follows:

Privacy

Skype uses 256-bit AES (Advanced Encryption Standard) for the encryption process with a total probability of a brute-force attack of 1.1 x E-77 times, while for a symmetric key exchange process using a 1024-bit RSA . Public key users will be certified by the Skype server when logging in using RSA 1536 or 2048-bit certificates. Skype will automatically encrypt all data before being transmitted over the internet.

Authentication

Every Skype user has a username and a password. And each username has a registered e-mail address. To enter the Skype system, the user must include the username and password pair. If the user forgets the password, Skype will change it and send the new password to the registered e-mail address of the user. This approach is known as E-mail Based Identification and Authentication. Because Skype is a voice communication system, each user can directly identify his interlocutor through his voice.

VoIP benefits

Lower charges for long distance connections. The main emphasis of VoIP is cost. With two locations connected to the internet, the cost of the conversation is very low. Make use of existing data network infrastructure for voice. Useful if the company already has a network. If it allows an existing network, VoIP networks can be built easily. No additional monthly fees are needed for additional voice communication.

Use of a smaller bandwidth than a regular telephone. With the advancement of technology bandwidth usage for voice is now very small. Data compression techniques allow sound to only require about 8kbps bandwidth. Allows to be combined with an existing local telephone network. With the gateway to the form of VoIP networks can be connected with PABX in the office. Inter-office communication can use ordinary telephone

Various forms of VoIP networks can be combined into large networks.

Weakness of VoIP

Sound quality is not as clear as the telephone network. Is the effect of sound compression with small bandwidth, there will be a decrease in sound quality compared to conventional etworks. But if the internet connection used is broadband / broadband internet connection, then the sound quality will be clear - even clearer than the phone connection and not intermittent.

There is a pause in communication. The process of changing data into sound, pausing the network, makes a pause in communication using VoIP. Except if you use a Broadband connection (see above).
If you have not been connected 24 hours to the internet, you need an appointment to connect.
If you use the internet and a computer behind a NAT (Network Address Translation), a special configuration is needed to make the VoIP run

There is never a quality guarantee if VoIP passes the internet







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