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/pjsip.conf

@@ -0,0 +1,30 @@
+; Asterisk PJSIP config
+
+[transport-udp]
+type=transport
+protocol=udp
+bind=0.0.0.0
+
+;Internal VoipClient
+[7000]
+type=endpoint
+context=from-internal
+callerid=DeskPhone <7000>
+disallow=all
+;Some phone may reqire other codecs,
+;the following are available ulaw,alaw,gsm,g726,g722,opus
+allow=g722
+auth=7000
+aors=7000
+
+[7000]
+type=auth
+auth_type=userpass
+password=<Password>
+username=7000
+
+[7000]
+type=aor
+; if one device is connected setting '1' is okay
+; when a device sometimes fails to register (like my Friz!box) try increasing it, '5' is a safe value
+max_contacts=1