 
 <prompt> The field of technology wey involve developing and applying telecommunication services to transmit voices or data between parties na wetin dem dey call? Given the previous question, write a context wey contain the answer. E fit be 1 - 20 sentences. Context: <response>: E no reach until di 1980s wey digital telephony transmission networks start dey possible, like ISDN networks wey dey assure minimum bit rate (usually 128 kilobits/s) for compressed video and audio transmission. During dis time, research dey go on for other forms of digital video and audio communication. Many of these technologies, like the Media space, no dey widely used like videoconferencing but dem still dey important for research. The first systems wey dey dedicated start to show for market as ISDN networks dey expand all over the world. One of di first commercial videoconferencing systems wey companies buy come from PictureTel Corp., wey do Initial Public Offering for November, 1984. 