Busy Lamp Field (BLF)
Allows users tracking the condition of the other telephone or the subscriber, for example, there will appear a signal on the screen of the telephone device informing that the subscriber is on the line and is temporarily unavailable.
A Real-time Transport Protocol (RTP) is a protocol standard defined by the Internet Engineering Task Force (IETF) that outlines a management system for programs using real-time transmission of data through mutlicast or unicast network services in multimedia situations. Originally designed by the IETF for videoconferencing for multiple participants, the protocol is largely used in Voice over Internet Protocol applications. Despite its name, the protocol cannot guarantee real-time delivery of data, however, the RTP does compensate for jitters and can detect when data arrives out of sequence, both issues being popular in VoIP communication. In IP telephony, RTP works with a signaling protocol, such as SIP or H.323, in order to set up connections in a network.
Kortel Communications
Kortel has a physical presence in Los Angeles, CA USA and prefers connectivity via VoIP packet interfaces with either H.323 or SIP. This reach minimises, or can even eliminate, the local access circuit cost which all too often becomes the highest cost ite
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