Signal to Noise Ratio - is the ratio between the strength of the signal and the strength of the noise in a specific bandwidth.
Session Initiation Protocol - this is the signalling protocol of IP telephony. SIP is a text-based protocol suitable for integrated voice and data applications.
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Short Message Service - the transfer of short text messages into a mobile phone.
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Simple Network Management Protocol - the online monitoring of a telecommunication device using a TCP/IP protocol (over a LAN or the Internet).
Also known as a media gateway controller or a call agent. An encompassing term for the new approach to telephony switching, developed to make voice traffic possible on packet-switched networks. On the most basic level, a softswitch is defined as the software for the media gateway controller which provides call management and source management for a media gateway. Call management relates to call settings and call termination, including call routing. A softswitch also provides the verification of calls, authorisation, and accounting services by providing access to information available in the existing network.
Session Traversal Utilities for NAT (network address translators) - STUN services help a VoIP device determine a public IP address of a router that connects the VoIP device to the Internet.
a mechanical or electronic device that opens and closes circuits, alters operating parameters, or selects routings for circuits on the basis of a space and time division.