@Stantuckio72
In the Swisscom Cockpit, you'll find an option that might explain why a Skype call can be blocked in the anonymous call filter 🤔
Cockpit > Settings > Call settings
Unlock number display via third-party provider
My phone number may be displayed when calling via a third-party provider and is no longer protected by Swisscom against misuse. Read more...
Unlock number display via third-party provider
Swisscom is taking technical measures against the improper display of telephone numbers. If you make your Swisscom number available to a third-party provider for display purposes, this may result in the number being suppressed for calls to the Swisscom network. If you activate the number display via third-party providers, you waive the aforementioned protection against misuse.