5.13 ISC gateway function

5.9 Void

5.10 Procedures at the IBCF

5.11 Procedures at the E-CSCF

5.12 Location Retrieval Function (LRF)

5.8A Procedures at the MRB

5.8 Procedures at the MRFC

5.7 Procedures at the Application Server (AS)

5.4.7A GRUU management

5.4.8 Emergency service