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Reply To: What’s SS7


Aaron, SS7 is a very complex interofice signalling protocol. It has the following blocks:

  • OMAP (Operation and Maintenance Part)
  • TCAP (Transaction Capability Part)
  • ISUP (ISDN Userp Part)
  • SCCP Signalling Connection Control Part)
  • MTP (Message Transfer Part)

Each part is applied based on what type of portion of the protocol is needed. You may require a further definition of ‘each’ part.

All these messages are totally digital and each part has their own set of information.

R2 is based on tones. An extreme simple protocol compared with the complexity of SS7. For every R2 tone there is another tone back. Message on R2 are defined in Forward (2 types) and Backward (2 Types).