Session Control Manager Overview
Features and Functionality - Licensed Enhanced Feature Support ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
Figure 150.
Interworking Between IPv4 UE and IPv6 IMS Core Network
IPv
4
UE
P
-
CSCF
IPv
4
/
IPv
6
I
-
CSCF
IPv
6
S
-
CSCF
IPv6
Dual Stack
IPv
6
IMS Core network
CCF
PCRF
Rf
IPv4/IPv6
Rx
IPv
4
/
IPv
6
DNS
IPv
4
/
IPv
6
To identify the need for IPv4-IPv6 interworking for a new incoming IPv6 REGISTER arriving at V6-SVC, a route
lookup is performed based on the request-uri, first in V4-SVC context and then in V6-SVC context if the first lookup
does not return any matching route entry. If a matching IPv4 next-hop route entry is found, then this indicates that
interworking needs to be done. If no route entry is found, then a DNS query on request-uri domain is done for both A
and AAAA type records. If DNS response yields only an IPv4 address, then this is also the case for performing IPv4-
IPv6 interworking.
Headers (such as Via, Path, etc.) are automatically set to IPv4 bind address of P-CSCF V4-SVC. Remaining headers
will be not be altered and sent as is toward the S-CSCF. The IPv4 address in a Path header received from S-CSCF in
200Ok of REGISTER will be replaced with V6-SVC‘s IPv6 address before forwarding to UE.
IPv6 Support
In addition to supporting IPv4, the SCM supports IPv6 addressing. A CSCF service can be configured with v6 addresses
to support an all v6 network.
Important:
For this feature, you may bind a CSCF service to either an IPv4 address or to an IPv6 address, but
not both simultaneously.
The following diagram shows the implementation where CSCF supports only IPv4.
Summary of Contents for ASR 5000 Series
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