Tech-invite3GPPspecsGlossariesIETFRFCsGroupsSIPABNFsWorld Map


IMS architecture evolution (up to Rel‑9)

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3GPP Rel-5 IMS architecture


Network element functions

AS     BGCF     HSS     I-CSCF     IMS-MGW     IP-CAN     MGCF     MRFC     MRFP     P-CSCF     S-CSCF     SLF    


Reference points

Cx     Dx     Go     Gm     ISC     Mb     Mg     Mi     Mj     Mk     Mm     Mn     Mp     Mr     Mw     Sh