sergey-safarov created an issue (kamailio/kamailio#4428)

### Description

Fedora and other RHEL distros have a 
[policy](https://docs.fedoraproject.org/en-US/packaging-guidelines/DefaultServices/#_must_not_listen_for_outside_connections)
> The service MUST NOT listen on a network socket for connections originating 
> on a separate physical or virtual machine.

For now, Kamailio listens to all interfaces by default. This behavior breaks 
the policy for RHEL-based dists.
I see two options here
1. install Kamailio with a disabled systemd unit;
2. update the Kamailio config file to listen to loopback interfaces only 
(`127.0.0.1` and `::1`).

It will be fine to choose one of these.
Personally, I prefer the second option.

### Expected behavior
Kamailio service should not accept external connections immediately after 
package installation.
Admin should allow external connection by updating the configuration file or 
enabling the service autostart.

#### Actual observed behavior
Kamailio service is enabled and listens to external connections by default.

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