@___ normally in the containers you can specify the dns server to use or include hosts directly in the static table, at the orchestrator level the ingress and egress options are used to specify interfaces and network configuration, although i think kubernetes stores everything in the etcd.
@tilefan today all home phones use SIP to communicate calls via the internet with the provider, is another way to make calls, a community of voice calls and SMS through the internet, it is normal that they appear.
@tilefan the SIP protocol is used for telephone communications through the network as internet, I mounted the centralites with Kamailio and the Android Mizudroid client.
@Wxnzxn if you have a well configured env file you can use the official docker containers.