VoWifi with Vodafone DE and pihole not working

[robinkre25]

Expected Behaviour:

Wifi Calling under Vodafone DE is working properly on other Wifis, also when i use my own one with just Telekom DNS or Cloudflare 1.1.1.1 without pihole.

Actual Behaviour:

No Wifi Calling working. Also no real entries at pihole Logs for domains which i can sort to wifi calling servers

Anyone knows which domains have to be whitelisted for Wifi Calling on Vodafone Germany? Or why its not working with pihole but with Cloudflare alone?

[jfb]

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