Cisco ASR 5000 series Product Overview page 598

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Table of Contents

▀ Features and Functionality - Licensed Enhanced Feature Support

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 4 / IPv 6

▄ Cisco ASR 5000 Series Product Overview

IPv 4 / IPv 6

IPv 6 / IPv 4

IPv 4 IMS Core network

Session Control Manager Overview