Signaling System No. 7 (SS7)

Everything that happens within a company to keep it running and earning money is referred to collectively as business operations.

The sigtran is the set of new protocol layers, uses SCTP protocol for transport of SS7 messages. The user of sigtran layer is an SS7 application or an SS7 layer. The application e.g SMSC, HLR etc. is the same for SS7 or Sigtran.