Hello, We are validating Wi-Fi Calling (VoWiFi) deployment in a mobile operator IMS network and would appreciate clarification regarding IPv6 support on iPhone devices. Our current environment includes: IMS Core supporting IPv4 and IPv6 connectivity ePDG platform with planned IPv6 enablement Dual-stack and IPv6-only access scenarios under evaluation Wi-Fi Calling service already operational over IPv4 We would like to understand Apple's requirements and recommendations for enabling VoWiFi over IPv6. Specifically: Does iPhone officially support Wi-Fi Calling over IPv6-only Wi-Fi access networks? Is VoWiFi supported when the Wi-Fi access network provides only IPv6 connectivity and the ePDG is reachable through AAAA DNS records? Are there any specific requirements regarding: ePDG IPv6 reachability AAAA DNS records IKEv2/IPsec over IPv6 transport Carrier Bundle configuration IMS APN IPv6 / IPv4v6 settings Are there iOS version dependencies or carrier configuration requirements to enable VoWiFi over IPv6? Is there any public Apple documentation covering IPv6 support for Wi-Fi Calling deployments from a carrier perspective? Our objective is to validate a future IPv6-based VoWiFi deployment and ensure compatibility with iPhone devices before enabling IPv6 transport in production. Any guidance or references would be greatly appreciated. Thank you.