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.
I don’t think we’ll be able to help you here. The Apple Developer Forums are primarily focused on helping developers with Apple APIs and developer tools. You’re asking about iOS’s on-the-wire behaviour, which isn’t something that my group, Developer Technical Support, can help you with.
If you’re working on behalf of a carrier, my advice is that you seek help via your carrier’s contact at Apple.
Share and Enjoy
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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