SIGTRAN

SIGTRAN is the name, derived from signaling transport, of the former Internet Task Force (I) working group that produced specifications for a family of protocols that provide reliable datagram service and user layer adaptations for Signaling System and ISDN communications protocols.wikipedia
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Stream Control Transmission Protocol

SCTPStream Control Transmission Protocol (SCTP)
It supports the same application and call management paradigms as SS7 but uses an Internet Protocol (IP) transport called Stream Control Transmission Protocol (SCTP), instead of TCP or UDP. The Stream Control Transmission Protocol provides the transport protocol for SIGTRAN user adaptation layer messages across an IP network.
The IETF Signaling Transport (SIGTRAN) working group defined the protocol (number 132 ) in 2000, and the IETF Transport Area (TSVWG) working group maintains it. RFC 4960 defines the protocol.

Signaling gateway

signalling gatewayGoogle VoiceSignaling Gateways
RFC 2719 also defines the concept of a signaling gateway (SG), which converts Common Channel Signaling (CCS) messages from SS7 to SIGTRAN.
A SIGTRAN Signaling Gateway is a network component that performs packet level translation of signaling from common channel signaling (based upon SS7) to SIGTRAN signaling (based upon IP).

Softswitch

soft switchesVoIP softswitch
Implemented in a variety of network elements including softswitches, the SG function can provide significant value to existing common channel signaling networks, leveraging investments associated with SS7 and delivering the cost/performance values associated with IP transport.
Note here that Analogue (ATA), PSTN telephone devices can only be reached by a softswitch that has embedded SS7 or SIGTRAN cards, software in terms of signalling AND Trunking Gateway for Voice traffic IP/TDM, TDM/IP, TDM/TDM functions.

Signalling System No. 7

SS7SS7 NetworkCCS7
SIGTRAN is the name, derived from signaling transport, of the former Internet Task Force (I) working group that produced specifications for a family of protocols that provide reliable datagram service and user layer adaptations for Signaling System and ISDN communications protocols.
The Internet Engineering Task Force (IETF) has defined the SIGTRAN protocol suite that implements levels 2, 3, and 4 protocols compatible with SS7.

Message Transfer Part

MTPMTP 2MTP layer 3
Message Transfer Part 2 (MTP) User Peer-to-Peer Adaptation Layer (M2PA), RFC 4165.
The signalling link functional level may also be provided using the SIGTRAN protocol M2PA described in RFC 4165.

Signalling Connection Control Part

SCCPNSP
Signalling Connection Control Part (SCCP) User Adaptation (SUA), RFC 3868.
In the SIGTRAN suite of protocols, there are two primary methods of transporting SCCP applications across Internet Protocol networks: SCCP can be transported indirectly using the MTP level 3 User Adaptation protocol (M3UA), a protocol which provides support for users of MTP-3—including SCCP.

Internet Engineering Task Force

IETFInternet Engineering Task Force (IETF)working group
SIGTRAN is the name, derived from signaling transport, of the former Internet Task Force (I) working group that produced specifications for a family of protocols that provide reliable datagram service and user layer adaptations for Signaling System and ISDN communications protocols.

Datagram

datagramsdatagram servicedatagram'' service
SIGTRAN is the name, derived from signaling transport, of the former Internet Task Force (I) working group that produced specifications for a family of protocols that provide reliable datagram service and user layer adaptations for Signaling System and ISDN communications protocols.

Integrated Services Digital Network

ISDN ISDNISDN30
SIGTRAN is the name, derived from signaling transport, of the former Internet Task Force (I) working group that produced specifications for a family of protocols that provide reliable datagram service and user layer adaptations for Signaling System and ISDN communications protocols.

Communication protocol

protocolprotocolscommunications protocol
SIGTRAN is the name, derived from signaling transport, of the former Internet Task Force (I) working group that produced specifications for a family of protocols that provide reliable datagram service and user layer adaptations for Signaling System and ISDN communications protocols.

Internet Protocol

IPInternet Protocol (IP)IP-based
It supports the same application and call management paradigms as SS7 but uses an Internet Protocol (IP) transport called Stream Control Transmission Protocol (SCTP), instead of TCP or UDP.

Public switched telephone network

PSTNtelephone networkpublic telephone network
Indeed, the most significant protocol defined by the SIGTRAN group is SCTP, which is used to carry PSTN signaling over IP. The SIGTRAN group was significantly influenced by telecommunications engineers intent on using the new protocols for adapting IP networks to the PSTN with special regard to signaling applications.

Telecommunication

telecommunicationscommunicationstelecom
The SIGTRAN group was significantly influenced by telecommunications engineers intent on using the new protocols for adapting IP networks to the PSTN with special regard to signaling applications.

Voice over IP

VoIPvoice over Internet Protocolvoice-over-IP
The SIGTRAN group was significantly influenced by telecommunications engineers intent on using the new protocols for adapting IP networks to the PSTN with special regard to signaling applications.

Transport layer

transporttransport protocollayer 4
The Stream Control Transmission Protocol provides the transport protocol for SIGTRAN user adaptation layer messages across an IP network.

Backhaul (telecommunications)

backhaulbackhaul networkback-haul
IUA provides an SCTP adaptation layer for the seamless backhaul of Q.921 user messages and service interface across an IP network.

Q.931

ITU-T Q.931
Some users that it supports are Q.931 and QSIG.

Chaos Computer Club

CCCBundestrojanerdiscovered by Chaos Computer Club
* Karsten Nohl, Mobile Self Defense, 31c3, CCC, 2 and Snort, 2018-03-31.