FritzBox CallMonitor

Description

If you don't have a phone with a display, then you are not able to see who is calling you before you pick up. If this phone is connected to a FRITZ!Box however, then this information can be accessed via a build in "CallMonitor" interface.

Preparations

To use the CallMonitor you have to enable it on the FRITZ!Box first. Type this key sequence on a phone connected to the FRITZ!Box:


#96*5*

Afterwards you should hear a short audio signal as confirmation. If you want to disable it again then you have to type:


#96*4*

Again followed by a short audio signal as confirmation.

To test whether the port is actually open you can either test with the nmap program:


nmap fritz.box -p1012

where the output should look something like this:


Nmap scan report for fritz.box (192.168.178.1)
Host is up (0.00050s latency).
PORT     STATE SERVICE
1012/tcp open  unknown

Nmap done: 1 IP address (1 host up) scanned in 0.04 seconds

Or you can test with the Telnet program:


telnet fritz.box 1012

If you see output like this:


Trying 192.168.178.1...
Connected to fritz.box.
Escape character is '^]'.

then it successfully connected to the CallMonitor port. When you now make a call to or from a phone which is connected to the FRITZ!Box, then you can already see call information like this:


date time;RING;connection_id;caller_number;callee_number;SIP1;\n
date time;CONNECT;connection_id;extension_id;caller_number;\n
date time;DISCONNECT;connection_id;duration_seconds;\n
date time;CALL;connection_id;extension_id;caller_number;callee_number;SIP1;\n

To disconnect the Telnet program press:


CTRL ]

and type:


quit

Screenshots

When you start the program you will see a window like this:
FritzBoxCallMonitor MainWindow

and in the system tray you see this icon:
FritzBoxCallMonitor TrayIcon

In the window you can:

Hide the window so only the tray icon stays visible. If you click on the tray icon then the window will reappear.
Set the host name or the ip-address of your FRITZ!Box (Default: fritz.box).
Set the port number of the call-monitor (Default: 1012).
Select an exported phone book, which is then being used for a reverse-lookup of the incoming caller number.
Set the timeout for the notification i.e. how long is the tray popup displayed.

When a call comes in then you will see a tray popup like this:
FritzBoxCallMonitor TrayPopup

Download

The source code can be downloaded from https://github.com/petermost/FritzBoxCallMonitor.