Cisco ASR 5000 Series User Manual

Session Control Manager Overview
▀ Features and Functionality - Licensed Enhanced Feature Support
▄ Cisco ASR 5000 Series Product Overview
OL-22938-02
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:
MSRP support when IPv4-IPv6 interworking is enabled
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.
P-CSCF handling different v4-v6 interworking scenarios is shown below.
Figure 149. Interworking Between IPv6 UE and IPv4 IMS Core Network
IPv 6
UE
P - CSCF
IPv 6 / IPv 4
I - CSCF
IPv 4
S - CSCF
IPv4
Dual Stack IPv 4 IMS Core network
CCF
PCRF
Rf
IPv4/IPv6
Rx
IPv 4 / IPv 6
IPv 4 / IPv 6
DNS

Cisco ASR 5000 Series Specifications

General

Brand	Cisco
Model	ASR 5000 Series
Category	Network Router
Language	English