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/Docs/Setup-Asterisk-Server.md

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+# Asterisk basic sever
+
+Features
+* Calling other connected/internal phones
+* Extension that plays an audio message
+* Extension that sends a http request (Node-Red for example) and plays an audio message
+* Extension that forwards the call the the Homeassistent 'Assistent' 
+* Extension with a IVR menu that will send the chosen option as a http request (Node-Red for example) and  plays an audio message
+
+
+## Installing Packages
+**Alpine Linux**
+
+```
+apk add asterisk asterisk-curl asterisk-opus asterisk-sounds-en asterisk-sounds-moh asterisk-speex asterisk-tds
+```
+
+## Configuring
+(Re)move the default asterisk config (`/etc/asterisk`).  
+Download the config files from here [Here](../Config-Examples/Asterisk-basic-server) and put them in the config directory `/etc/asterisk`.  
+Set the permissions `chown -R asterisk: /etc/asterisk`.  
+Edit the configuration files to suit your needs,  
+make sure to change the credentials, and check the module list 
+
+**Alpine Linux**
+```
+chown -R asterisk: /etc/asterisk
+rc-update add asterisk
+service asterisk start
+```
+
+# Asterisk bluetooth bridge
+[Source](https://hotkey404.com/connect-your-phone-to-raspbx-via-bluetooth-with-chan_mobile/)  
+Features
+* Bridge a mobile phone to a voip phone/pbx
+
+
+## Installing Packages
+**Alpine Linux**
+
+```
+apk add asterisk asterisk-opus asterisk-mobile udev bluez hidapi
+```
+
+## Configuring
+(Re)move the default asterisk config (`/etc/asterisk`).  
+Download the config files from here [Here](../Config-Examples/Asterisk-BT_bridge) and put them in the config directory `/etc/asterisk`.  
+Set the permissions `chown -R asterisk: /etc/asterisk`.  
+Edit the credentials for your (soft)phone in `/etc/asterisk/pjsip.conf`  
+Pair the phone using `bluetoothctl`
+Edit the phone and adapter bluethooth mac address  in `/etc/asterisk/chan_mobile.conf`  
+(Re)start Asterisk 
+Connect to Asterisk CLI `asterisk -r`  
+Make sure the phone is discoverable/in pairing mode  
+In Asterisk CLI run `mobile search`  
+Change the port to the port from mobile scan in `/etc/asterisk/chan_mobile.conf`  
+Restart Asterisk 
+
+**Alpine Linux**
+```
+chown -R asterisk: /etc/asterisk
+modprobe btusb
+modprobe uhid
+rc-update add asterisk
+rc-update add bluetooth
+service asterisk start
+```  
+
+**bluetoothctl**
+```
+#Open the bluetoothCLI
+bluetoothctl
+scan on
+pair <Mac Of phone>
+```