README: Document IP & hostname overwrite

README.md

@@ -31,7 +31,7 @@ Just add this `location` block to a valid `server` configuration:
 
 ```
     location /sip {
-        proxy_pass                    http://127.0.0.1:8090; # Adjust to your webrtc-sip-gw Docker host's IP
+        proxy_pass                    http://FILL_YOUR_IP:8090; # Adjust to your webrtc-sip-gw Docker host's IP
         proxy_http_version            1.1;
         proxy_set_header Upgrade      $http_upgrade;
         proxy_set_header Connection   "upgrade";
@@ -64,6 +64,14 @@ Unless you have not explicitly disabled TLS:
 - `cd` into the new directory.
 - Create a `ssl` folder.
 
+### Hostname & IP Address
+
+By default, webrtc-sip-gw is automatically using the hostname of your Docker host and the IP address of an interface.
+
+In case you need to use a different hostname or IP address than the automatically set, e.g. because you have multiple interfaces and webrtc-sip-gw selected the wrong one, you can overwrite the automatically set values.
+
+Set the `MY_IP` environment variable to overwrite the IP address, and set the `MY_DOMAIN` environment variable to overwrite the hostname.
+
 ### Certificate
 
 The certificate should be placed in the `ssl` directory and named `sipgw.crt`.

docker-compose.yml

@@ -10,4 +10,4 @@ services:
      - ./ssl/sipgw.key:/etc/ssl/privkey.pem:ro # Can be left out when TLS is disabled
      - ./ssl/sipgw.crt:/etc/ssl/fullchain.pem:ro # Can be left out when TLS is disabled
     environment:
-     - TLS_DISABLE=true # Optional, defaults to false
+     - TLS_DISABLE=false # Optional, defaults to false