How to convert VoIP in CT?

Channel voices of time-division multiplexing (TDM) is a 64-kbit/s data stream, the voice according to the rules of the PCM (Pulse Code Modulation) encoded.

Voice over IP (VoIP) can be encoded in several ways. Encoder / decoded a codec such as digitized voice called determined.

Codecs

The codec determines the pattern of bits used, to represent the voice.The codec voice digitized with PCM is the g. g.711 codec.

VoIP codecs belonging to 729 and G.. 723. 1. Analysis of each codec encoded a small sample of the voice. Get noise by phone the encoded representation. Each codec uses different rules to encode the voice.

Real time protocol

Real time protocol contains calendar information bits, convert to actual digitized world signals.The allow example produced by the codec header is placed in a RTP (real time protocol).

RTP header contains the synchronization information at the end of the remote control to play the sound with the right schedule required. RTP header contains a field of type payload distance to tell what codec was used to create the voice data.

Conversion CT

CT signal can be converted to real sound.At destination, type of the payload in the RTP header field determines the type of codec.

Synchronization information is extracted from the RTP header. The output codec at the reception desk is a stream of data from the ECHP that can be transmitted over a network CT 64-kbit/s.