Merge pull request #3533 from EMG70/pbx-readme

Pbx readme [Wave Lite app option, so Android phones actually ring when screen's locked etc]

roles/pbx/README.adoc

@@ -156,6 +156,26 @@ image::files/linphone_setup.jpg[width='33%']
 image::files/linphone_connected.jpg[width='33%']
 
 * _If you've created more than one extension, make a call to another extension!_  If you've not yet made more than one extension, try calling an arbitrary extension, or try calling your own extension (your own phone number).
++
+Due to Linphone's inability for phones to ring when the screen is locked, you can alternatively use a softphone (SIP) app on your smartphone or laptop called Wave Lite.  In this example we will use the  [https://wiki.zenitel.com/wiki/Grandstream_Wave_Lite_mobile_app], on an Android phone.  After you open the app, follow these steps:
+
+** Connect your smartphone or laptop to the *Internet in a Box* WiFi hotspot
+** Go to Account Settings
+** Add new account
+** Select *SIP ACCOUNT*
+
+*** *Account name* is your name, e.g. John Doe
+*** *Sip Server* is your IIAB server's IP address
+*** *SIP User ID* is your extension number, e.g. 301
+*** *SIP Authentification ID* is your extension number, e.g. 301
+*** *Password* is the same as above *Secret*
+*** *Confirm by clicking tick symbol ✓ (top right)
++
+image::files/wave_sip settings.png[width='33%']
+
+** If the connection is successful, you will see a green circle next to your name [John Doe].
++
+image::files/Wave_sip_phone_connected.png[width='33%']
 
 ** You should see activity in the *FreePBX Statistics* applet at http://box/freebx (or http://box:83/freebx) > *Dashboard*
 ** Connection details may also be seen in the Asterisk logs at: `/var/logs/asterisk/full`