Glossary VoIP Terms ANI Automatic Number Identification A telephone function that transmits the billing number of the incoming call (Caller ID, for example). MGCP Media Gateway Control Protocol A protocol for IP telephony that enables a caller with a PSTN phone number to locate the destination device and establish a session. BLI Busy Lamp Indicator A light or LED on a telephone that shows which line is in use. PBX Private
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