VoIP Phrases - An A-ZM- VoIP Phrases MGCP - Media Gateway Control Protocol is an internal protocol used within a Voice Over IP network. It is used by telecommunications providers to gain more control over subscribers. It consists of a Call Agent, at least one Media Gateway and one Signaling Gateway. The Call Agent’s principle job is to direct the Media and Signaling Gateways, rather than getting directly involved in the coding and decoding. Media Gateway - A device that is used on the edge of an IP network, which converts data from one network into a format so it can pass on another different network, eg from the PSTN to an IP network. MPLS - Multiprotocol Label Switching is a mechanism of carrying data which emulates the characteristics of a circuit-switched network over a packet-switched network. It can be ised to carry all sorts of different traffic types, including packet data, ATM and Ethernet. N- VoIP Phrases NAT (Network Address Translation) - This is the process of re-writing both the origin and destination IP Addresses for IP packets as they pass through a router or a firewall. In most cases, this is to allow multiple users on a LAN or other network access to use the Internet through a single public IP address. O- VoIP Phrases OSI reference model – see link P- VoIP Phrases Packetised voice - Any voice call which is converted into discrete packets in order to be transported over an IP network. Packet loss - A situation where one or more packets does not arrive at its final destination. This causes a noticeable gap in the flow of voice that may seem like the person talking is missing parts of their speech! PBX - This is simply a telephone exchange which is located with and run by a business as opposed to a telecoms operator. The benefit of a PBX is that the business has a full control over its internal network. PDD - Post Dial Delay – the period of time between the caller completing the dialing of a number and the ringing tone being heard at the other end. For some networks, PDD can be as long as 20 seconds, depending on how long it takes to establish a connection. This is particularly an issue on international calls over traditional networks. Peering (IP) – this is the interconnection of discretely separate IP networks by IP Service Providers. The aim of IP Peering is to gain access to each other’s network, and therefore to increase the throughput of traffic on the networks, as well as broadening their own reach. The basis on which IP Peering works is to have no revenue exchange, but simply to allow the other party’s traffic to pass on your network, but gain increased revenue from your existing customers, given that they can now reach more destinations, more flexibly. PCM (Pulse Code Modulation) – a method of encoding an analogue voice signal into a digital stream of 1’s and 0’s. PSTN (Public Switched Telephony Network) – refers to the national network within a country, made up of all the circuit-switched networks linked together. In other words, the PSTN is the traditional network for transporting voice traffic, as opposed to an IP network. Q-R- VoIP Phrases QoS (Quality of Service) – see the section Quality of Service Q.931 - This is a connection control protocol used for ISDN, and can be directly compared to TCP for the Internet. It has also recently been used in some mobile phone transmission systems. Router (IP) - A router sits in the Network Layer of the OSI Interconnect model and serves to pass data packets across the network to their end destination. Intelligent routers will choose the most efficient path to send that traffic. Navigate From VoIP Phrases To Home Page
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