C Interface

C interface is between the MSC and HLR.

Overview

C interface is between the MSC and HLR. It uses MAP over TCAP, SCCP, SIGTRAN XUA, SCTP transport protocol.

Network Diagram

Messages

  • SendAuthenticationInfoArg
  • SendAuthenticationInfoRes
  • UpdateLocationArg
  • UpdateLocationRes
  • MO_ForwardSM_Arg
  • MO_ForwardSM_Res
  • InsertSubscriberDataArg
  • InsertSubscriberDataRes

Call Flows

Standards

  • 3GPP TS 09.02 (MAP v1, MAP v2)
  • 3GPP TS 29.002 (MAP v3) - MAP for 3G UMTS & GSM (Release 99 and later)