SIP Application

CSCF

  • P-CSCF: Proxy Call Session Control Function
  • S-CSCF: Serving Call Session Control Function
  • I-CSCF: Interrogate Call Session Control Function

Diameter

  • User-Authorization-Request [UAR](https://tools.ietf.org/html/rfc4740#page-22”>User-Authorization-Request{:target=”_blank”}
  • User-Authorization-Answer UAA

  • Server-Assignment-Request SAR
  • Server-Assignment-Answer SAA

  • Location-Info-Request LIR
  • Location-Info-Answer LIA

  • Multimedia-Auth-Request MAR
  • Multimedia-Auth-Answer MAA

  • Registration-Termination-Request RTR
  • Registration-Termination-Answer RTA

  • Push-Profile-Request PPR
  • Push-Profile-Answer PPA

PCRF

  • Credit-Control-Request CCR
  • Credit-Control-Answer CCA

  • Re-Auth-Request RAR
  • Re-Auth-Answer RAA

  • Bearer Binding and Event Reporting Function [BBERF]
  • Policy and Charging Enforcement Function [PCEF]
  • Policy and Charging Rule Function [PCRF]