Cisco Cisco Packet Data Gateway (PDG) Wartungshandbuch

Generally Available    06-30-2010

SCM Features in Release 9.0

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This section provides information for new features in Release 9.0 for the Session Control 
Manager (SCM). Additional information on these features can be found in the Session 
Control Manager Overview section of the Product Overview, in the Session Control 
Manager Administration Guide, and in the CLI Reference Guide.

This feature allows the P-CSCF to provide IPv4-IPv6 interworking in the following 
scenarios:

●

When UEs are IPv6-only and the IMS core network is IPv4-only 

●

When UEs are IPv4-only and the IMS core network is IPv6-only 

In addition, IPv4-IPv6 interworking helps an IPv4 IMS network transition to an all-IPv6 
IMS network. 

The following interworking requirements are currently supported:

●

IPv4 TCP and IPv6 TCP

●

Transport switching allowed based on size for both v4 and v6 network

●

UDP fragmentation allowed for both v4 and v6 networks

●

P-CSCF supports Mw and Gm interfaces on both v4 and v6

●

KPIs for Mw and Gm interfaces are supported on both v4 and v6 

●

DNS supported for v4 and v6 networks

●

Interworking supported for IM and presence

●

Both v4 and v6 handsets are supported simultaneously on the same P-CSCF node

P-CSCF will provide IPv4-IPv6 interworking functionality between IPv6-only UEs and 
IPv4-only core network elements (I/S-CSCF) by acting as a dual stack. To achieve the 
dual-stack behavior, P-CSCF will be configured in two services with the first service 
(V6-SVC) listening on an IPv6 address and the second service (V4-SVC) listening on an 
IPv4 address. SIP messages coming from IPv6 UEs will come to V6-SVC and will be 
forwarded to the IPv4 core network through V4-SVC. Similarly, messages from the IPv4 
core network come to V4-SVC and will be forwarded to IPv6 UEs via V6-SVC. P-CSCF 
also provides interworking functionality between IPV4-only UEs and IPv6-only core 
network elements.