What is SS7?
Signaling System number 7 (SS7) is a legacy PSTN protocol that is in use in carrier networks Some markets use SS7 to connect to large enterprises (such as a call center) It is a very vast protocol set It is the base for the PTSN. All GSM networks run on SS7. Network Nodes are identified with Point Codes. SS7 protocol has several layers MTP 1, 2, 3 for routing messages ISUP for call set-up TCAP for transactions (800, CNAM, LNP)
SS7 VoIP Gateway Components
As networks are moving to VoIP, there is a need for Media Gateways to convert PSTN Media and Protocols to IP based Media and Protocols An SS7 Media Gateway needs Telecom Interface (typically T1/E1) IP Network Interface (typically Ethernet) Protocol interpreters (or stacks) – SS7 ISUP / SIP Lots of software to transform and translate how things are done on each side of the gateway.
- Service Providers
- IVR and Contact Centers
- Open Source Telephony
- Mobile Value Added Services
