The Internet has shifted to the current 128-bit IP protocol but some networks are still lagging behind. This talk is about issues with the dual stack scenario, changes to protocols needed and real world experiences of implementations.

SIP was written for both IPv4 and IPv6, but not for both at the same time. The talk is about experiences from SIPit tests, code and real world implementations on mobile networks - what happens with your software when being faced with both protocols? Can this affect your old IPv4-only implementation as well? What is the best option when my software crashes and generates core dumps?