VoIP Acronyms: A Link - Access Link - is a SL (Signalling Link) connecting a signalling end point to an STP (Signalling Transfer Point). Only messages that are originating from or destined to the signalling end point are transmitted on this link. ANI - Automatic Number Identification tor Ar ASR - Answer Seizure Ratio ? (successfull calls / total calls) * 100 BHCA - Busy Hour Call Attempts CIC - Circuit Identification Code - On the signalling path the CIC provides information about where the voice part of the call is carried - on which trunk and in which timeslot. Disconnect Cause Codes LERG - Local Exchange Routing Guide. Telcordia produced guide used primarily within the North American Numbering Plan (NANP). LNP - Local Number Portability F Link - Fully Associated Link, connects two signalling end points. "F" links are not usually used in networks with STP (Signalling Transfer Points). In networks without STPs, "F" links directly connect signalling points. MOU - Minutes of Use PDD - Post Dial Delay SBC - Session Border Controller STP - Signalling Transfer Point VAD - Voice activity detection is an algorithm used in speech processing wherein the presence or absence of human speech is detected in regions of audio. Voice activity detection (VAD) may not only indicate the presence or absence of speech, but also other aspects of the speech, for example whether the speech is voiced, unvoiced or sustained. Voice activity detection is usually language independent. A VAD feature in VOIP can disable the silence packets and use the silent period to transmit some traffic other than voice.