A CDE Definition
A network device that converts control signals from one format to another. For example, a SIGTRAN signaling gateway converts SS7 signals of the PSTN to SIGTRAN for transport over IP. Contrast with media gateway. See SIGTRAN.
(SIGnaling TRANsport) An IP telephony protocol from the IETF that is used to transfer SS7 signals over IP networks. The telco switch sends SS7 signals to a signaling gateway (SG) that converts them into SIGTRAN packets, which travel over IP to the next signaling gateway or to a softswitch if the destination is not another PSTN. SIGTRAN uses the Stream Control Transmission Protocol (SCTP) for reliable transport. See IP telephony and SCTP.
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