Dear IPv6 working group, during the ripe90 meeting I made (and collected) different experiences with WLAN-call (a built in feature for "native" phoning via WIFI instead of via 4G/ 5G). My conclusion is, it strongly depends. (even it does not work reliable in IPv4-only networks). Nevertheless, I don't expect wonders, when using IMS/SIP via ipsec via 464xlat. As long the providers only provide A-Records here: epdg.epc.mnc0XX.mcc262.pub.3gppnetwork.org (for Germany XX 01,02,03/07,23) I think it won't get better. Does anybody know if 3gpp has also IPv6/IPv6 defined ipsec connections for it? (instead of IPv6(payload) via IPv4(transport)) After the meeting another built in function came in to my mind: printing Do people print in android and iOS? Does it work out of the box - "zeorconf" via mDNS/airprint in IPv6-only/mostly? A test in my home environment (cups/avahi) showed: It can work, but only with the alternative print service by mopria. The default/standard print service in android did not work at all. Do you have any experiences with that? Regards, Thomas