This document covers the Procedure for Configuring the SIP Voice Gateway for IPV6 with examples.
Configuring a SIP Voice Gateway for IPv6
Users in a SIP network are identified by unique SIP addresses. A SIP address is similar to an e-mail address and is in the format of sip:userID@gateway.com. The user ID can be either a username or an E.164 address. The gateway can be either a domain (with or without a hostname) or a specific Internet IPv4 or IPv6 address.
A SIP trunk can operate in one of three modes: SIP trunk in IPv4-only mode, SIP trunk in IPv6-only mode, and SIP trunk in dual-stack mode, which supports both IPv4 and IPv6.
A Cisco Unified Border Element can interoperate between H.323/SIP IPv4 and SIP IPv6 networks in media flow-through mode. In media flow-through mode, both signaling and media flows through the Cisco Unified Border Element, and the Cisco Unified Border Element performs both signaling and media interoperation between H.323/SIP IPv4 and SIP IPv6 networks as shown in the below diagram.
Procedure to configure SIP Voice Gateway for IPv6
Step1: Enabling VoIPv6 Service on Cisco Gateway
Router> enable Router # configure terminal Router(config)# voice service voip Router(config-voi-serv)# shutdown forced
Step2: Enabling VoIPv6 Submodes on Cisco Gateways
Router> enable Router # configure terminal Router(config)# voice service voip Router(config-voi-serv)# sip Router(config-serv-sip)# call service stop
Step3: Configuring the Protocol Mode of the SIP Stack
SIP service should be shut down before configuring the protocol mode. After configuring the protocol mode as IPv6, IPv4, or dual-stack, SIP service should be reenabled.
ANAT is automatically enabled on SIP trunks in dual-stack mode. This task describes how to disable ANAT in order to use a single-stack mode.
Router> enable Router # configure terminal Router(config)# voice service voip Router(config-voi-serv)# sip Router(conf-serv-sip)# no anat
Step5: Configuring the Source IPv6 Address of Signaling and Media Packets
Users can configure the source IPv4 or IPv6 address of signaling and media packets to a specific interface’s IPv4 or IPv6 address. Thus, the address that goes out on the packet is bound to the IPv4 or IPv6 address of the interface specified with the bind command. The bind command also can be configured with one IPv6 address to force the gateway to use the configured address when the bind interface has multiple IPv6 addresses. The bind interface should have both IPv4 and IPv6 addresses to send out ANAT.
Router> enable Router # configure terminal Router(config)# voice service voip Router(config-voi-serv)# sip
Router(config-serv-sip)# bind control sourceinterface FastEthernet0/0
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