When opening a notification channel, the API returns the WebSocket URL.
I am located in Europe.
The WebSocket URL returned is:
wss://carrier-pigeon.eu-west-1.mypurecloud.ie/v1/channels/xxxxxxx
That is currently the only carrier pigeon address, but that may change in the future. The best practice recommendation is to allow traffic to all AWS IP addresses. More information can be found here: https://help.mypurecloud.com/articles/purecloud-ports-services/