Glossary

Acoustic echo is caused by direct and indirect feedback from the speaker(s) to the microphone(s). An Acoustic Echo Canceller electronically removes both the direct coupling and the reflected echo, enabling true full-duplex hands-free telephony for both mobile phones and desktop speakerphones. There are many AEC algorithms to choose from and ...

The devices we use today for communications generate noise - it can be the A/C supply connected to them, the fans they have internally to keep their CPUs cool, or a myriad of other such "noise generators". While this noise may not be loud, the microphones will usually be close ...

Abstract Syntax Notation One, a language used to describe the complex data structures independently from the underlying hardware. ASN.1 is a standard developed by the ITU-T and is described in X.680-X.694. ASN.1 is used in the H.323 and 3G-324M Recommendations in order to describe all the messages that are exchanged ...

Representation of an image width to its height. A general notation is the form of X:Y where X represent the image width and Y represent the image height.While there are several video standards that are currently used in video applications, it is necessary to keep aspect ratio stable when converting ...

An ATA is a device which connects on one side to an analog phone and on the other side connects to the internet using VoIP.In most cases, ATAs are considered IADs if they can terminate more than a single phone line.RADVISION's Multimedia Terminal Framework is especially suited for use in ...

In telephony, Auto Attendant (Automated Attendent) allows callers to be automatically transferred to a specific extension without any intervention from an operator.Most auto attendants offer a menu system, that allows user to be routed to its desired location.With the introduction of Video Telephony, auto attendant is usually implemented using visual ...