Via the Mb reference point IPv6 network services are accessed. These IPv6 network services are used for user data
transport. Note, that GPRS provides IPv6 network services to the UE, i.e. the GPRS Gi reference point and the IMS Mb reference point may be the same.
The Mc reference point describes the interfaces between the MSC Server and CS-MGW, and between the GMSC
Server and CS-MGW. It has the following properties:
Full compliance with the H.248 standard, baseline work of which is currently carried out in ITU-T Study
Group 16, in conjunction with IETF MEGACO WG.
Flexible connection handling which allows support of different call models and different media processing
purposes not restricted to H.323 usage.
Open architecture where extensions/Packages definition work on the interface may be carried out.
Dynamic sharing of MGW physical node resources. A physical MGW can be partitioned into logically separate
virtual MGWs/domains consisting of a set of statically allocated Terminations.
Dynamic sharing of transmission resources between the domains as the MGW controls bearers and manage
resources according to the H.248 protocols.
The functionality across the Mc reference point will need to support mobile specific functions such as SRNS
relocation/handover and anchoring. It is expected that current H.248/IETF Megaco standard mechanisms can be
applied to enable this.