Make clearer the external IP address

Author: ffdixon

_posts/2019-02-15-install.md

@@ -754,20 +754,21 @@ Next, the websocket forwarding address in nginx.  Edit the file `/etc/bigbluebut
   auth_request_set $auth_status $upstream_status;
 }</code></pre>
 
-Note: As of BigBlueButton 2.2.29 (and later), you can have nginx proxy incoming WSS connections to WS on port 5066 to work around a [bug in FreeSWITCH](https://github.com/bigbluebutton/bigbluebutton/issues/9667).  If you are using 2.2.29 or later, you can run the following BASH script to implement the workaround:
+Note: As of BigBlueButton 2.2.29 (and later), you can have nginx proxy incoming WSS connections to WS on port 5066 to work around a [bug in FreeSWITCH](https://github.com/bigbluebutton/bigbluebutton/issues/9667).  If you are using 2.2.29 or later, you can run the following BASH script to implement the workaround.   Again, here we have `EXTERNAL_IP_ADDRESS` as 203.0.113.1, but you would substitute your own external IP.
 
 ~~~
 #!/bin/bash
 
+EXTERNAL_IP_ADDRESS=203.0.113.1  # <-- put in your own external IP address
+
 yq w -i /usr/share/meteor/bundle/programs/server/assets/app/config/settings.yml public.media.sipjsHackViaWs true
 sed -i 's/https/http/g'  /etc/bigbluebutton/nginx/sip.nginx 
 sed -i 's/7443/5066/g'  /etc/bigbluebutton/nginx/sip.nginx 
 
-IP=203.0.113.1  # <-- put in your own external IP address
 TARGET=/usr/local/bigbluebutton/bbb-webrtc-sfu/config/default.yml
 
-xmlstarlet edit --inplace --update '//param[@name="ws-binding"]/@value' --value "$IP:5066" /opt/freeswitch/conf/sip_profiles/external.xml
-yq w -i $TARGET freeswitch.sip_ip "$IP"
+xmlstarlet edit --inplace --update '//param[@name="ws-binding"]/@value' --value "$EXTERNAL_IP_ADDRESS:5066" /opt/freeswitch/conf/sip_profiles/external.xml
+yq w -i $TARGET freeswitch.sip_ip "$EXTERNAL_IP_ADDRESS"
 ~~~
 
 If you use [bbb-install.sh](https://github.com/bigbluebutton/bbb-install) to install/upgrade BigBlueButton, it will automatically apply the above changes.  If you manually upgrade your BigBlueButton server, you can add the above lines to [apply-conf.sh](/2.2/customize.html#apply-confsh) to have the above settings applied by `bbb-conf` when doing the [manually upgrade](/2.2/install.html#upgrading-from-bigbluebutton-22) steps.