Telecommunications Glossary of terms used on this site

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Term Definition

Synchronous Digital Hierarchy

Service Frame

A Service Frame is a an Ethernet frame transmitted across the User Network Interface (UNI) toward the Service Provider or an Ethernet frame transmitted across the UNI toward the Subscriber.

Service Level Agreements

A Service Level Agreement, or SLA, is a set of contractual stipulations, i.e. obligations, on behalf of a telecommunications carrier or service provider to meet or exceed predefined service performance metrics.

Aliases (separate with |): Service Level Agreement|SLA
Service Multiplexing

A User Network Interface (UNI) attribute in which the UNI can be in more than one Ethernet Virtual Connection (EVC) instance.

Session Announcement Protocol

Session Announcement Protocol or SAP is a protocol for broadcasting multicast session information.

Aliases (separate with |): SAP
Session Border Controller

Session Border Controller or SBC is a device used in some Voice over Internet Protocol or VoIP networks to exert control over the signaling and often the media streams concerned with setting up, conducting, and tearing down telephone calls or other interactive media communications. SBCs usually reside between two service provider networks and perform security, connectivity, quality of service, regulatory and statistical functions.

Aliases (separate with |): SBC
Session Description Protocol

Session Description Protocol or SDP is a mechanism for describing streaming media initialization parameters in an ASCII string. After preliminary iterations, the Internet Engineering Task Force or IETF defines SDP as Request for Comments or RFC 4566. SDP is designed for describing multimedia communication sessions for the purposes of session announcement, session invitation, and parameter negotiation. SDP does not deliver any media, but is used for negotiation between end points of media type, format, and all associated properties. The set of properties and parameters are often called the session profile. SDP is designed to be extensible to support new media types and formats.

Aliases (separate with |): SDP
Session Initiation Protocol

Session Initiation Protocol or SIP is an Internet Engineering Task Force (IETF) signaling protocol (RFC 3261), widely used for controlling multimedia communication sessions such as voice calls, video calls, video conferencing, streaming multimedia distribution, instant messaging, presence information and file transfer over Internet Protocol (IP). The SIP protocol can be used for creating, modifying and terminating two-party (unicast) or multiparty (multicast) sessions consisting of one or several media streams. Modification can include changing addresses or ports, inviting more participants, and adding or deleting media streams.

Aliases (separate with |): SIP
SIP Trunking

Session Initiation Protocol Trunking, or SIP Trunking, uses an IP-enabled network to faciliate a connection between a voice service provider and a customer premise, replacing conventional telephone trunk lines. SIP enabled devices, using the SIP protocol, can include IP Phones, Mobile Phones, IP-PBX, gateways and other equipment facilitating true end-to-end transport of Voice over IP, and further application integrations. SIP manages call connections, and facilitating the VoIP calls, typically alongside data on converged networks, reducing an organizations operational, administrative, management and recurring expenses.

Aliases (separate with |): SIP Trunk|SIP Trunks

Service Level Agreement

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