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SIP & IPv6
                        Dual stack issues
                        SIP Forum Conference call 12.12.12



                                  oej@edvina.net



onsdag 12 december 12
Agenda


                   • Locating SIP servers in a dual stack world
                        •   Happy Eyeballs and SIP

                   • UA media address familiy capability


onsdag 12 december 12
Living in a dual stack
                                world
                   •    RFC 3261 supports either IP4 OR IPv6

                   •    We need to adopt to a dual stack world in order to
                        enable IPv6 migration

                   •    RFC 6157 attempts to handle this, but focuses on
                        media

                   •    ICE supports dual stack media negotiation (with the
                        IPv6 priority addition)
                                                       Let’s separate SIP and media
                                                        sessions (RTP/MSRP/T.38)


onsdag 12 december 12
Locating SIP servers
                            RFC 3263
                   • Clearly says that a SIP device needs to look
                        up IPv4 or IPv6
                   • We need to replace ”or” with ”and” and
                        apply happy eyeballs to find the next hop.
                        64 times T1 for failover will NOT be
                        accepted by users



onsdag 12 december 12
I see two issues

                   • Indicating preference of address family in
                        DNS SRV records
                   • Setting up a connection to a dual stack
                        server from a dual stack client
                        •   HAPPY EYEBALLS FOR SIP!

                        •   Affects STCP,TCP and UDP transports




onsdag 12 december 12
Locating a SIP server
                   • NAPTR doesn’t bother with address family
                   • SRV records point to host names
                   • Hosts can be single stack IPv4, single stack
                        IPv6 or dual stack.
                   • NAPTR can be used to indicate preference
                        of transport. SRV can be used to indicate
                        preference of address family.
                SIP



onsdag 12 december 12
The IPv6 preferred chain
             ;;                    Priority Weight Port         Target
                        IN   SRV   10        3      5060         server1.sipguru.no.
                        IN   SRV   10        1      5060         server2.sipguru.no.
                        IN   SRV   20        1      5060         server3.sipguru.no.
                        IN   SRV   20        2      5060         server4.sipguru.no.


                                                _sip._udp.sipguru.no


                               Priority 10                                 Priority 20


                  Server1 75%          Server2 25%              Server3 33%        Server4 67%


                                                                       A                  A


                        AAAA                 AAAA                  AAAA                  AAAA


                             No IPv4 records!

onsdag 12 december 12
SIP & Happy eyeballs




onsdag 12 december 12
Happy SIP UAs
                           IPv4                IPv4


                           IPv6                IPv6



                   • Two network paths to the same service
                        from the same device


onsdag 12 december 12
Oh no.

                            IPv4                    IPv4


                            IPv6                    IPv6


                   • If the first selected path doesn’t work,
                        what’s the failover time?
                   • This will affect SIP Trunking (SIPconnect)
onsdag 12 december 12
Http Solution


                   • Happy Eyeballs
                   • RFC 6555 by Dan Wing
                   •    http://ipv6friday.org/blog/2012/04/happyeyeballs/



                                                        Needs to be applied to SIP.



onsdag 12 december 12
UA capability
                        Discovering support for IPv6 and/or IPv4




onsdag 12 december 12
UA IPv6 capability
                   •    In some cases, a SIP Server needs to know if a
                        UA is single stack IPv4, single stack IPv6 or
                        dual stack

                   •    Signalling address family is not proof enough. A
                        dual stack SIP client may decide to send over
                        IPv4 - which doesn’t reveal the IPv6 capability

                   •    This applies to server-based NAT traversal
                        support


onsdag 12 december 12
Hosted RTP proxys
                   •    The proxy receives signalling with IPv6

                   •    Checks all the contacts associated with an AOR

                   •    How does it detect dual stack clients?

                   •    What does it base a decision for adding an IPv4-
                        IPv6-rtpproxy on?

                   •    Either dual registrations or a contact capability
                        indication.



onsdag 12 december 12
SIP Outbound
                   •    Can be used

                   •    Two registers with REG-ID over IPv4 and two with
                        the same REG-ID over IPv6 or two registrations
                        with dual contacts

                   •    Four flows to maintain
                        •   Not very practical

                        •   Lack of Outbound implementations

                        •   Not a short-term fix with a simple upgrade path for firmware




onsdag 12 december 12
The short term fix

                   • A way to indicate UA media capability for
                        various address families in the contact
                   • This way, server can make policy decisions
                        on media NAT support




onsdag 12 december 12
Suggested priority

                   • Happy eyeballs-fixes for SIP - SIP in a dual
                        stack network
                   • Add dual stack indication in Contact
                   • Make it possible for SIP Forum members to
                        add IPv6 in dual stack mode without adding
                        support requests...



onsdag 12 december 12
SIPit 30
                   • Raleigh-Durham, NC, USA
                   • February 18-22
                   • Sponsor: Cisco
                   • Will include IPv6 testing!
                   • Online tests will also be available latest in Jan
                        2013


                        http://www.sipit.net
onsdag 12 december 12
STAY CONNECTED.
               Add IPv6 to your unified communications platform today.

                                                    Join us here:
                                                                                    twitter.com/sipv6
                                       6            edvina.net/sipv6
             facebook.com/sipv                                                                   ts:
                                                                    Vendor tests at SIPit even
                           Development discussion:                        www.sipit.net
                                                  list
                         sip-implementors mailing




onsdag 12 december 12
Final message:
                        No,WebRTC will not solve all these issues.




                                                                     ;-)
onsdag 12 december 12

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Sipforum SIP & IPv6 discussion slides

  • 1. SIP & IPv6 Dual stack issues SIP Forum Conference call 12.12.12 oej@edvina.net onsdag 12 december 12
  • 2. Agenda • Locating SIP servers in a dual stack world • Happy Eyeballs and SIP • UA media address familiy capability onsdag 12 december 12
  • 3. Living in a dual stack world • RFC 3261 supports either IP4 OR IPv6 • We need to adopt to a dual stack world in order to enable IPv6 migration • RFC 6157 attempts to handle this, but focuses on media • ICE supports dual stack media negotiation (with the IPv6 priority addition) Let’s separate SIP and media sessions (RTP/MSRP/T.38) onsdag 12 december 12
  • 4. Locating SIP servers RFC 3263 • Clearly says that a SIP device needs to look up IPv4 or IPv6 • We need to replace ”or” with ”and” and apply happy eyeballs to find the next hop. 64 times T1 for failover will NOT be accepted by users onsdag 12 december 12
  • 5. I see two issues • Indicating preference of address family in DNS SRV records • Setting up a connection to a dual stack server from a dual stack client • HAPPY EYEBALLS FOR SIP! • Affects STCP,TCP and UDP transports onsdag 12 december 12
  • 6. Locating a SIP server • NAPTR doesn’t bother with address family • SRV records point to host names • Hosts can be single stack IPv4, single stack IPv6 or dual stack. • NAPTR can be used to indicate preference of transport. SRV can be used to indicate preference of address family. SIP onsdag 12 december 12
  • 7. The IPv6 preferred chain ;; Priority Weight Port Target IN SRV 10 3 5060 server1.sipguru.no. IN SRV 10 1 5060 server2.sipguru.no. IN SRV 20 1 5060 server3.sipguru.no. IN SRV 20 2 5060 server4.sipguru.no. _sip._udp.sipguru.no Priority 10 Priority 20 Server1 75% Server2 25% Server3 33% Server4 67% A A AAAA AAAA AAAA AAAA No IPv4 records! onsdag 12 december 12
  • 8. SIP & Happy eyeballs onsdag 12 december 12
  • 9. Happy SIP UAs IPv4 IPv4 IPv6 IPv6 • Two network paths to the same service from the same device onsdag 12 december 12
  • 10. Oh no. IPv4 IPv4 IPv6 IPv6 • If the first selected path doesn’t work, what’s the failover time? • This will affect SIP Trunking (SIPconnect) onsdag 12 december 12
  • 11. Http Solution • Happy Eyeballs • RFC 6555 by Dan Wing • http://ipv6friday.org/blog/2012/04/happyeyeballs/ Needs to be applied to SIP. onsdag 12 december 12
  • 12. UA capability Discovering support for IPv6 and/or IPv4 onsdag 12 december 12
  • 13. UA IPv6 capability • In some cases, a SIP Server needs to know if a UA is single stack IPv4, single stack IPv6 or dual stack • Signalling address family is not proof enough. A dual stack SIP client may decide to send over IPv4 - which doesn’t reveal the IPv6 capability • This applies to server-based NAT traversal support onsdag 12 december 12
  • 14. Hosted RTP proxys • The proxy receives signalling with IPv6 • Checks all the contacts associated with an AOR • How does it detect dual stack clients? • What does it base a decision for adding an IPv4- IPv6-rtpproxy on? • Either dual registrations or a contact capability indication. onsdag 12 december 12
  • 15. SIP Outbound • Can be used • Two registers with REG-ID over IPv4 and two with the same REG-ID over IPv6 or two registrations with dual contacts • Four flows to maintain • Not very practical • Lack of Outbound implementations • Not a short-term fix with a simple upgrade path for firmware onsdag 12 december 12
  • 16. The short term fix • A way to indicate UA media capability for various address families in the contact • This way, server can make policy decisions on media NAT support onsdag 12 december 12
  • 17. Suggested priority • Happy eyeballs-fixes for SIP - SIP in a dual stack network • Add dual stack indication in Contact • Make it possible for SIP Forum members to add IPv6 in dual stack mode without adding support requests... onsdag 12 december 12
  • 18. SIPit 30 • Raleigh-Durham, NC, USA • February 18-22 • Sponsor: Cisco • Will include IPv6 testing! • Online tests will also be available latest in Jan 2013 http://www.sipit.net onsdag 12 december 12
  • 19. STAY CONNECTED. Add IPv6 to your unified communications platform today. Join us here: twitter.com/sipv6 6 edvina.net/sipv6 facebook.com/sipv ts: Vendor tests at SIPit even Development discussion: www.sipit.net list sip-implementors mailing onsdag 12 december 12
  • 20. Final message: No,WebRTC will not solve all these issues. ;-) onsdag 12 december 12