Added following snippits about Asterisk

* A Basic Asterisk server for internal calling with IVR, curl triggers and message playback
* A Asterisk server to act as a bridge between a Bluetooth phone (as in/out bound route)
* A Node-Red Subflow to create a call between extensions using ARI

Linux/Config-Examples/Asterisk-BT_bridge/extensions.conf

@@ -0,0 +1,12 @@
+; Asterisk exention configuration
+
+[from-internal]
+;Internal extentions (Phone,softphones or other Voip clients)
+exten => 7000,1,Dial(PJSIP/${EXTEN},30)
+
+;Outbound route
+exten => _X.,1,Dial(mobile/phone0/${EXTEN})
+
+;Inbound route
+[incoming-mobile]
+exten => s,1,Goto(from-internal,7000,1)