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3GPP Glossaries



Interfaces / Reference Points





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 C     #  Cr     #  Cx    


C   (MAP)

between  HLR  and  MSC


The Gateway MSC server must interrogate the HLR of the required subscriber to obtain routing information for a call or a short message directed to that subscriber.

Signalling on this interface uses MAP (TS 29.002). For CAMEL purposes, this interface is used as described in TS 23.078. It is used e.g. at terminating calls to exchange routeing information, subscriber status, location information, subscription information, etc.

Source:   TS 23.002, clause

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Cr  (SIP)

between  AS  and  MRFC

specified, from Rel-8, in TS 23.218
clauses 8.2 and 9.2 

This reference point enables the MRFC to fetch and cache documents and resources from an Application Server and to return data to an Application Server. It enables media control protocol requests, responses and notifications to be sent between the MRFC and an Application Server.

Source:   TS 23.002, clause 6a.7.5a

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Cx  (Diameter)

between  HSS  and  S-CSCF / I-CSCF

specified from  Rel-5
in  TS 23.228  and  TS 29.229

Main procedures:
  • Serving CSCF assignment
  • Routing information retrieval from HSS to CSCF
  • Authorisation (e.g., checking of roaming agreement)
  • Authentication: transfer of security parameters of the subscriber between HSS and CSCF
  • Filter control: transfer of filter parameters of the subscriber from HSS to CSCF.
  • UAR/UAA:  User-Authorization-Request/Answer
  • SAR/SAA:  Server-Assignment-Request/Answer
  • LIR/LIA:  Location-Info-Request/Answer
  • MAR/MAA:  Multimedia-Auth-Request/Answer
  • RTR/RTA:  Registration-Termination-Request/Answer
  • PPR/PPA:  Push-Profile-Request/Answer
See also  RFC 6733  for Diameter Base Protocol, and  TS 29.230  for 3GPP-specific Diameter codes and identifiers.

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