This section describes the interfaces supported between the SMF and other network functions in the 5GC.
* N4—Reference point between the SMF and UPF.
* N7—Reference point between the SMF and PCF.
* N10—Reference point between the UDM and SMF.
* N11—Reference point between the AMF and SMF.
* N40—Reference point between the SMF and CHF.
* S5—Interface between the PGW-C and S-GW.
* S2b—Interface between the PGW-C and ePDG.
