Introduction
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
Procedure to configure SIP Voice Gateway for IPv6
Step1: Enabling VoIPv6 Service on Cisco Gateway
Router> enable
Step2: Enabling VoIPv6 Submodes on Cisco Gateways
Router> enable
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.
Router> enable
Router(config-sip-ua)# protocol mode dual-stack Syntax: protocol mode {ipv4 | ipv6 | dual-stack [preference {ipv4 | ipv6}]}
Step4: Disabling ANAT Mode
Router> enable
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(config-serv-sip)# bind control sourceinterface FastEthernet0/0 Syntax: bind {control | media | all} source-interface interface-id [ipv6-address ipv6-address]
Router> enable
Router(config-sip-ua)# sip-serveripv6:[2001:0DB8:0:0:8:800:200C:417A] Syntax: sip-server {dns:[host-name] | ipv4:ipv4-address | ipv6:[ipv6-address][:port-num]}
Router(config-sip-ua)# keepalive target ipv6:[2001:0DB8:0:0:8:800:200C:417A] Syntax: keepalive target {{ipv4:address | ipv6:address} | [:port] | dns:hostname} [tcp [tls]] | udp] [secondary]
Step7: Configuring the Session Target
Router> enable Router(config)# dial-peer voice 29 voip Syntax: dial-peer voice tag {mmoip | pots | vofr | voip}
Router(config-dial-peer)# destination-pattern 7777 Syntax: destination-pattern [+]string[T]
Router(config-dial-peer)# session target [ipv6:2001:0DB8:0:0:8:800:200C:417A] Syntax: session target {ipv4:destination-address | ipv6:[destination-address] | dns:[$s$. | $d$. | $e$. | $u$.]
Step8: Configuring SIP Register Support
Router> enable
Router(config-sip-ua)# registrar ipv6:[3FFE:501:FFFF:5:20F:F7FF:FE0B:2972] Syntax:registrar {dns:address | ipv4:destination-address [:port] | ipv6:destination-address[:port]} aor-domain expires seconds [tcp [tls]] type [secondary] [scheme string] expires 3600 secondary
Router(config-sip-ua)# retry register 10 Router(config-sip-ua)# timers register 500
Step9: Configuring Outbound Proxy Server Globally on a SIP Gateway
Router> enable Router(config-voi-serv)# sip
Router(config-serv-sip)# outbound-proxy ipv6[2001:0DB8:0:0:8:800:200C:417A] Syntax: outbound-proxy {ipv4:ipv4-address |]ipv6:ipv6-address | dns:host:domain} [:port-number]
Step10: IPv4 to IPv6 Media Interoperating Through Cisco IOS MTP
Cisco Unified Border Element must be configured in IPv6-only or dual-stack mode to support IPv6 calls.
Router> enable
Router(config-voi-serv)# allow-connections h323 to sip Syntax: allow-connections from-type to to-type |
Configuration Examples for Implementing VOIP over IPv6
1. Configuring the SIP Trunk
This example shows how to configure the SIP trunk to use dual-stack mode, with IPv6 as the preferred mode. The SIP service must be shut down before any changes are made to protocol mode configuration.
Router(config)# sip-ua
Router(config-sip-ua)# protocol mode dual-stack preference ipv6
2. Configuring the Source IPv6 Address of Signaling and Media Packets
This example shows how to configure the bind command:
Router(config)# voice service voip
Router(config-voi-serv)# sip
Router(config-serv-sip)# bind control source-interface FastEthernet 0/0
3. Configuring the SIP Server
This example shows how to configure the SIP server:
Router(config)# sip-ua
Router(config-sip-ua)# sip-server ipv6:[2001:0DB8:0:0:8:800:200C:417A]
4. Configuring the Session Target
This example shows how to configure the session target:
Router(config)# dial-peer voice 29 voip
Router(config-dial-peer)# destination-pattern 7777
Router(config-dial-peer)# session target ipv6:[2001:0DB8:0:0:8:800:200C:417A]
5. Configuring SIP Register Support
This example shows how to configure SIP register support:
Router(config)# sip-ua
Router(config-sip-ua)# registrar ipv6:[2001:0DB8:0:0:8:800:200C:417A] expires 3600 secondary
Router(config-sip-ua)# retry register 10
Router(config-sip-ua)# timers register 500
6. Configuring H.323 IPv4 to SIPv6 Connections in a Cisco Unified Border Element:
This example shows how to configure H.323 IPv4 to IPv6 connections in an Cisco Unified Border Element.
Router(config)# voice service voip
Router(config-voi-serv)# allow-connections h323 to sip
7. Configuring MTP for IPv4-to-IPv6 Translation
The following example shows how to configure MTP for IPv4-to-IPv6 translation and provides sample configuration output:
Router(global)# sccp ccm group 1
Router(config-sccp-ccm)# associate profile 5 register MTP3825
Router(config-sccp-ccm)# exit
Router(config)# dspfarm profile 5 mtp
Router(config-dspfarm-profile)# codec g711ulaw
Router(config-dspfarm-profile)# maximum sessions software 100
Router(config-dspfarm-profile)# associate application SCCP
Router# show sccp
sccp ccm group 1
associate profile 5 register MTP3825
!
dspfarm profile 5 mtp
codec g711ulaw
maximum sessions software 100
associate application SCCP
Verify
Verifying SIP Gateway Status
The show sip-ua calls command displays active user agent client (UAC) and user agent server (UAS) information on SIP calls:
Router# show sip-ua calls
Use the show sip-ua connections command to display SIP UA transport connection tables:
Router# show sip-ua connections udp brief
Router# show sip-ua connections udp detail
Use the show sip-ua status command to display the status of the SIP UA:
Router# show sip-ua status