Compliance
In order for the software of different manufacturers to work in concert, it is necessary to support standards, such as H. 323. Standards are a critical factor for the world of IP telephony. One of the most important areas of standardization is the messaging protocol in IP telephony. Follow this link to get more information on a-z voip termination wholesale - portal.voiplatinum.com
In order for the software of different manufacturers to work in concert, it is necessary to support standards, such as H. 323. Standards are a critical factor for the world of IP telephony. One of the most important areas of standardization is the messaging protocol in IP telephony. Follow this link to get more information on a-z voip termination wholesale - portal.voiplatinum.com
Previously, IP-telephony used closed protocols; Accordingly, the participants in the conversation had to have similar products. Intel and Microsoft led the development of standards based on H. 323, recommended by the International Telecommunications Union (ITU). This standard formulates technical requirements for the transmission of audio and video data over data networks and includes standards for video codecs, voice codecs, public applications, call management and system management.
Let's list the technical requirements for voice codecs:
Small bandwidth (8 Kbps or less);
High quality of voice;
Small delays;
The possibility of reconstructing lost packets.
When transmitting in real time, up to 30% of the packets can be lost, therefore, the IP telephony application must be able to recover lost data, given the complexity of the encoding algorithms.
In addition, IP-telephony systems should be able to support different codecs and, if necessary, add new ones. By default, voice codecs in the H. 323 standard use the standard G. 711. However, the bandwidth of 64 kbps required in G. 711 is unacceptable when used on the Internet, where most users have a channel of much smaller width.
In addition to G. 711, the H. 323 standard allows the use of G. 722, G. 723, G. 723. 1, MPEG1, G. 728, and G. 729 codecs. Standards that define a low bandwidth are G. 729 in 8 Kbps and G. 723 at 5. 3/6. 3 Kbps, - are quite suitable for use on the Internet. In particular, Intel, Microsoft and Netscape have announced support for G. 723 in IP telephony applications. The main drawback of G. 723 is that it requires very large CPU resources. Intel, for example, defines a 100-MHz Pentium processor as the minimum for use in Internet telephony.
Great hopes are placed on the Resource Reservation Protocol (RSVP), through which it is possible to pass through the reservation of the Internet bandwidth for the transmission of a delay-sensitive schedule. RSVP was designed to transfer multimedia over IP networks, but it can work well for voice transmission. According to this protocol, the routers exchange signals, requesting a free path through the network. Its main drawback is that there can be so many requests that the routers will not be able to service them.
Let's list the technical requirements for voice codecs:
Small bandwidth (8 Kbps or less);
High quality of voice;
Small delays;
The possibility of reconstructing lost packets.
When transmitting in real time, up to 30% of the packets can be lost, therefore, the IP telephony application must be able to recover lost data, given the complexity of the encoding algorithms.
In addition, IP-telephony systems should be able to support different codecs and, if necessary, add new ones. By default, voice codecs in the H. 323 standard use the standard G. 711. However, the bandwidth of 64 kbps required in G. 711 is unacceptable when used on the Internet, where most users have a channel of much smaller width.
In addition to G. 711, the H. 323 standard allows the use of G. 722, G. 723, G. 723. 1, MPEG1, G. 728, and G. 729 codecs. Standards that define a low bandwidth are G. 729 in 8 Kbps and G. 723 at 5. 3/6. 3 Kbps, - are quite suitable for use on the Internet. In particular, Intel, Microsoft and Netscape have announced support for G. 723 in IP telephony applications. The main drawback of G. 723 is that it requires very large CPU resources. Intel, for example, defines a 100-MHz Pentium processor as the minimum for use in Internet telephony.
Great hopes are placed on the Resource Reservation Protocol (RSVP), through which it is possible to pass through the reservation of the Internet bandwidth for the transmission of a delay-sensitive schedule. RSVP was designed to transfer multimedia over IP networks, but it can work well for voice transmission. According to this protocol, the routers exchange signals, requesting a free path through the network. Its main drawback is that there can be so many requests that the routers will not be able to service them.