IMS Network Element - AGCF Overview (TISPAN IMS-Based PES)

IMS Network Element - AGCF Overview (TISPAN IMS-Based PES) (Study Note)

Discussion: CS-Based PES, IMS-Based PES and IMS PSS

AGCF Function OV:
- AGCF appears as a P-CSCF to the other CSCFs
- Act as an MGC for controlling media gateways functions
- The first point of contact for residential and access media gateways
- Perform signalling interworking between SIP and analog signalling via the P1 reference point.
- Act as a SIP User Agent
- Delivering the appropriate dialtone pattern;
- Processing mid-call events

AGCF to interact with the resource control subsystem (SPDF in RACS) for the following purposes:
- authorization of QoS resources;
- resource reservation;
- gate control (including NAPT binding information relay)

e2 supports information transfer between the P-CSCF or the AGCF and the CLF of Network Attachment Subsystem.
- AGCF may require to control residential or access media gateways
- Receipt of an off-hook or flash-hook event from MG, AGCF shall autonomously request the MG to play a dial tone, or aware of dial tone changes in case some specific supplementary services are activated, or Special dial tone if using service code
- etc.

Further Information: https://docs.google.com/fileview?id=F.c094cbfe-f59d-4d0c-87eb-2fe62d24f562