The document discusses the compatibility of SIP (Session Initiation Protocol) and IPv6, highlighting that IPv6 functions properly with various SIP software and devices. It identifies challenges related to NAT, address formatting, DNS, and interoperability, while providing insights into the transition strategies and the necessity of adapting software and infrastructure for IPv6. Additionally, it encourages collaboration among technical communities to facilitate the adoption of SIP over IPv6 through shared knowledge and best practices.

1. SIP and IPv6 – Can They Get Along?
SIP Network Operators Conference (SIPNOC)
June 26, 2012
Dan York
Senior Content Strategist
york@isoc.org
+1-802-735-1624
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2. Dan York
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www.danyork.me
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3. www.worldipv6launch.org/infographic/
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4. The Good News!
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5. IPv6 Works Fine!
Linphone – http://www.linphone.org
Open source, free and available for Linux, Windows and MacOS X
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6. Linphone and IPv6
Linphone – http://www.linphone.org
Open source, free and available for Linux, Windows and MacOS X
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7. More SIP Softphones Supporting IPv6
Jitsi (formerly SIP Communicator)
§ www.jitsi.org
Counterpath Bria
§ www.counterpath.com
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8. In Fact, There Are Many More:
IP Phones (Desktop): Other SIP Devices
• Avaya (unclear on exact models) • Cisco SIP Gateways ( ISR 28XX
• Mitel 53xx Series & 38XX, AS5400 )
• Mocet • Mediatrix
• Siemens OpenStage
• Mitel Border Gateway (MBG)
• Snom
IP-PBXs/Call Servers
• Asterisk 1.8+ SIP Services (in the cloud)
• Brekeke SIP • INUM.net
• Cisco Unified Communications
Manager 7.1
• Freeswitch 1.1+
• Kamailio 3.1+
• OpenSIPS
• Voxeo Prophecy and PRISM
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9. Why IPv6?
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10. In The Beginning...
192.168.20.12
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11. Mobility
www.flickr.com/photos/kapungo/3396823518/
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12. A Plethora of Portable Platforms
www.flickr.com/photos/clonedmilkmen/5111779335/
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13. Internet of Things
www.flickr.com/photos/dmje/5159177886/
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14. Internet of Things
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15. Internet of Things
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16. EVERYTHING
over
IP
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17. Only 2 Billion People
Are Online –
What About The
Other 5 Billion?
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18. How IP Address Allocation Works
Regional Internet Registries (RIRs)
Internet Service Providers (ISPs)
You
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19. Global IPv4 Disparity !
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20. Oops... as of Feb 1, 2011...
All Gone!
Regional Internet Registries (RIRs)
Internet Service Providers (ISPs)
You
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21. Solutions?
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22. IPv4 Marketplace
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23. Prolonging IPv4 - NAT Today
NAT
Public
IP
Private
IP
Addresses
PC
Home
Internet Firewall Firewall
Firewall
IP
ISP
Phone
Home
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24. Carrier Grade NAT (a.k.a. LSN)
NAT
Public
IP
Private
IP
Addresses
PC
Home
Internet Firewall Firewall
Firewall
IP
ISP
Phone
Home
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25. Old NATs Never Die...
NAT
NAT
Public
IP
Private
IP
Private
IP
Addresses
Addresses
PC
Home
Internet Firewall Firewall
Firewall
IP
ISP
Phone
Home
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26. The Problem?
SIP NAT
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27. Oh, and by the way...
(sorry... we still have NAT-like networks with IPv6...)
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28. And then there is...
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29. IPv6 Challenges:
User Interfaces
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30. See the problem?
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31. See the problem?
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32. IPv4
192.168.20.12
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33. IPv6
2001:db8:34a5:23:aa1f:12f4:9009:1234
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34. IPv6 Address Compression
2001:db8:34a5:0:0:0:0:1
2001:db8:34a5::1
(oh, and they aren’t case-sensitive)
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35. IPv6 Addresses
127.0.0.1 ::1
0.0.0.0 ::
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36. DNS is your friend!
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37. IPv6 Challenges:
Port Numbers
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38. IPv4 Port Numbers
192.168.20.12:5060
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39. IPv4 Port Numbers in IPv6?
192.168.20.12:5060
2001:db8:34a5::1234:5060
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40. IPv6 Port Numbers
[2001:db8:34a5::1234]:5060
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41. IPv6 addressing
http://[2001:db8:34a5::1234]/index.html
http://[2001:db8:34a5::1234]:8080
sip:dan@[2001:db8:34a5::1234]
sip:dan@[2001:db8:34a5::1234]:5060
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42. IPv6 Challenge:
Multiple Addresses
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43. IPv4 – Single Address / Interface
192.168.20.12
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44. IPv6 – Multiple Addresses / Interface
192.168.20.12
2001:db8:34a5:92:21c:a5ff:fe12:3a80
(global)
fe80::21c:a5ff:fe12:3a80
(link-local)
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45. IPv6 – Neighbor Discovery
No More DHCP For Address
Assignment
(well, unless you want it)
Router Advertisements vs ARP
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46. IPv6 – Address Creation
Router Advertisement
2001:db8:34a5:92:21c:a5ff:fe12:3a80
Autoconfiguration from
Ethernet Address
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47. The Key Point…
Can Your Device/Software/Etc. Work
With Multiple IP Addresses?
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48. IPv6 Challenges:
DNS
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49. IPv4 and DNS
example.com 3600 IN A 192.168.20.12
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50. IPv6 and DNS
example.com 3600 IN A 192.168.20.12
example.com 3600 IN AAAA 2001:db8:34a5::1234
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51. IPv6 DNS Fun
What if DNS gives a AAAA....
but your system doesn’t have
“real” IPv6 connectivity?
(You can retrieve AAAA records over IPv4)
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52. UNhappy Eyeballs
DNS
Svr
example.com A 192.168.20.12
example.com AAAA 2001:db8:34a5::1234
AAAA
?
You (a long time later...)
A
?
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53. Happy Eyeballs
DNS
Svr
example.com A 192.168.20.12
example.com AAAA 2001:db8:34a5::1234
AAAA
?
A
?
You
(sent at same time;
whichever replies first wins)
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54. Happy Eyeballs
RFC 6555
tools.ietf.org/html/rfc6555
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55. IPv6 Challenges:
Storing IP Addresses
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56. How Do You Store IP Addresses?
Memory?
Databases?
Config Files?
Room for two? (or more?)
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57. Config Files
<category name="SIP">
<item name="Server1">127.0.0.1:5060
</item>
</category>
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58. IPv6 and SIP
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59. RFC 6157
RFC 6157
“IPv6 Transition in the Session
Initiation Protocol (SIP)”
tools.ietf.org/html/rfc6157
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60. SIP Architecture
SIP SIP
Proxy Proxy
A SIP B
SIP SIP
Alice Bob
Media (RTP, MSRP, etc.)
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61. SIP Reality
SIP SIP SIP SIP SIP
Proxy Proxy Proxy Proxy Proxy
A SIP B SIP C SIP D SIP N
SIP Internet (or WAN) SIP
Media Media
Alice Proxy Proxy Bob
Media A Media B Media
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62. “SIP” = Multiple Protocols
SIP
SDP
RTP
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63. IPv4/IPv6 Fun
Communicating between IPv4 client and IPv6 client
through a proxy
§ Record-Route: <sip:2001:db8::1;lr>
§ Record-Route: <sip:192.0.2.1;lr>
Mixed communication across a path of proxies
Mixed communication: IPv6 for SIP, IPv4 for media
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64. IPv6 and SDP
Only allows a single IP address per media stream (“c=“
parameter)
§ c=IN IP4 192.168.20.12
§ c=IN IP6 2001:db8:34a5::1234
Multiple proposals for additional SDP parameters
§ ex. ANAT - RFC 4091 & 4092 – now deprecated by IETF but used
in US military’s AS-SIP
§ draft-boucadair-mmusic-altc-05 – “Alternate Connectivity
Attribute”
The IETF way forward is ICE – RFC 5245
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65. NAT, NAT, NAT...
STUN, TURN, ICE
(RFC 5245)
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66. Discovery of SIP Servers
User agents need to find SIP servers/proxies
DHCPv6
§ SIP Options in RFC 3319
DNS SRV, NAPTR and AAAA Records (RFC 3263)
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67. Other IPv6 Considerations
Other interfaces
§ Web and management systems
§ Logging
§ APIs
Custom SIP headers
Multi-vendor interoperability
SBC and firewall support for SIP over IPv6
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68. SIP Forum “IPv6” Mailing List
sipforum.org/mailman/listinfo/ipv6
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69. SIPit Test Events
sipit.net
SIPit 28: “68% of the implementations present supported IPv6.”
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70. Get Started With IPv6...
Deploy360 Programme
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71. SIP Forum “IPv6” Mailing List
sipforum.org/mailman/listinfo/ipv6
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72. Attend the IPv6 BOF Tomorrow…
12:45-1:30pm
• Exchange of experiences
• Should SIP Forum charter a working group?
• What could working group do?
• Document existing best practices for working with SIP over IPv6
(perhaps in the form of a short whitepaper or document).
• Identify current technical issues with using SIP over IPv6.
• Maintain/develop a list of IPv6-enabled SIP/VoIP software/
hardware/services.
• Identify/develop case studies about successful migration of SIP
services to IPv6
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73. Dan York
Senior Content Strategist
Internet Society
york@isoc.org
+1-802-735-1624
Thank You!
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