. Call Admission Control (CAC)—A method of preventing oversubscription of VoIP networks. Unlike QoS tools, CAC is call-aware and acts as a preventive congestion control by attempting to route calls across other media before making a determination to block a call rather than impacting the quality of existing calls.
. Call Detail Records (CDR)—A record produced by a phone system containing details of calls that have passed through it. They track information such as the number of the calling party, the number of the called party, the time of call initiation, the duration of the call, the route by which the call was routed, and any fault condition encountered. These records might be used for cross billing, for tracking of an employee’s usage of the system, or for monitoring system uptime and issues.
. Client Access License (CAL)—A software license that entitles a user to access specific systems or specific features in a system. Usually these come in two flavors: Standard and Enterprise.
. Common Intermediate Format (CIF)—A format used to standardize the vertical and horizontal resolutions in video signals, often in video conferencing systems.
. Communicator Web Access (CWA)—The browser-based Communicator client provided by Lync Server.
. Direct Inward Dialing (DID)—A service offered by telephone companies wherein one or more trunk links is provided to a customer for connection to the customer’s PBX. Incoming calls are routed to internal destination numbers at the PBX. This enables a company to have significantly more internal lines than it does external lines.
. Dual-tone multi-frequency (DTMF)—A method for providing telecommunication
signaling over analog telephones lines in the voice frequency band. DTMF is also
referred to as Touch Tone. This technology enables users to initiate events in the
phone system by simply pressing a button on a keypad.
. Extensible Markup Language (XML)—A set of rules for encoding documents in a
machine-readable format. The goal of XML is to be a simple and open standard for
representing arbitrary data structures, most often in web services.
. Extensible Messaging and Presence Protocol (XMPP)—An open, XML-based protocol designed to provide near real-time extensible IM and presence information. It has since expanded into VoIP and file transfer signaling.
. Hardware Load Balancing (HLB)—A method of distributing a workload across multiple computers to optimize resource utilization, increase throughput, and provide a level of redundancy through the use of an external hardware device.
. IM—A form of real-time, direct, text-based communication between multiple parties. IM is sometimes referred to as online chat.
. Interactive Voice Response (IVR)—A technology that enables a system to detect voice and dual-tone multifrequency inputs. IVR is often used in telecommunications for automated decision trees. This technology powers concepts such as “press 1 for English” when providing for call routing.
. Mean Opinion Score (MOS)—In multimedia, MOS provides a numerical indication of the perceived quality of a call after compression and/or transmissions. MOS is expressed as a single number ranging from 1 to 5 where 1 is the lowest perceived audio quality and 5 is the highest perceived audio quality.
. Network Address Translation (NAT)—A method of modifying network address information when packets pass through a traffic routing device. This effectively remaps a packet from one IP space to another. NAT is common in home usage where multiple computers with a private IP addressing site behind a router or firewall that holds a publically routable address. NAT maps a port back to the initiating internal host and reroutes responses back to the originating host.
. Network Load Balancing (NLB)—A method of distributing a workload across multiple computers to optimize resource utilization, increase throughput, and provide a level of redundancy through the use of software running in the operating system.
. Personal Identification Number (PIN)—A secret numeric password shared between a user and a system that is used to authenticate the user to the system.
. PSTN—The network of the world’s public circuit-switched telephone networks. The first company to provide PSTN services was Bell Telephone.
. Plain Old Telephone Service (POTS)—Another term for a PSTN.
. Private Branch Exchange (PBX)—A telephone system that serves a particular business or office as opposed to a common carrier or a system for the general public. This is what traditionally provides voice services to companies that are connected to the local exchange to provide external connectivity for telephone calls.
. Quality of Experience (QoE)—A subjective measure of a customer’s experiences with a vendor or service.
. Quality of Service (QoS)—A mechanism to control resource reservation in a system; typically, it is a method to prioritize various traffic types to ensure a minimum level of performance for a particular type of traffic.
. Real Time Protocol (RTP)—A standardized packet format for delivering audio and video over the Internet. RTP’s claim to fame is the capability to deal with large amounts of packet loss before the impact on the call becomes noticeable.
. Remote Call Control (RCC)—A method of utilizing a phone resource on one system with a resource on another. Typically, in the context of Lync Server, this is the capability to use a Communicator client to place a call through a desk phone that is controlled by a PBX rather than by Lync Server.
. SIP—An Internet Engineering Task Force (IETF) defined protocol used for controlling multimedia communications sessions. The goal of SIP is to provide a common signaling and call setup protocol for IP-based communications.
. SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE)—An open standard protocol suite that provides for the registration of presence information and the receipt of presence status notifications.
. Survivable Branch Appliance (SBA)—A combination of Registrar, Mediation Server, and PSTN gateway that is designed to maintain most voice services for a site that has lost connectivity to the main Lync Server site.
. Role Based Access Control (RBAC)—An approach to restricting system access to authorized users by granting the rights based on the role served by the user. This normally results in granular permissions with an eye toward granting the minimum level of rights needed to perform a task.
. Transmission Control Protocol (TCP)—Generally considered one of the core protocols of the Internet. TCP is a protocol that provides reliable ordered delivery of a stream of packets from one device to another. TCP has the reliability advantage of performing an acknowledgement of receipt of a packet back to the sender. This acknowledgement, however, comes at a performance price and ultimately limits the scalability of TCP.’
. Uniform Resource Identifier (URI)—A string of characters used to identify a name or a resource on the Internet. This allows interaction with representations of the resource over a network, often the Internet, using various protocols.
. User Datagram Protocol (UDP)—Another method of delivering a stream of packets from one device to another. UDP does not attempt to order or verify delivery of packets, nor does it need to first initiate a conversation with a destination host via a handshake. This behavior makes it faster and more scalable than TCP, but ultimately, it is less reliable.
. Virtual Private Network (VPN)—A method of passing packets across a public network in a secured and authenticated manner. VPNs enables users to access their private corporate networks through connections to the public Internet.
. Voice over IP (VoIP)—A generic term for transmission technologies that deliver voice communications over IP-based networks. Also referred to as IP Telephony or Internet Telephony.
Source of Information : Pearson-Microsoft Lync Server 2010 Unleashed
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