AASTRA CTI Touch User Guide User Manual
Page 17
Configuration Notes
15
7.
After successfully establishing a VPN connection, start up a web browser on the
smartphone. Enter the IP address or the DNS name of the communications system
into the address input field of the browser. Add the port number 8080 after a colon
(see
If a VPN connection cannot be established, use the Configurator diagnosis function
on the Diagnose: Tcpdump page. Deactivate the Text option. Click on the Start
button. Repeat establishing the VPN connection. Click on the Stop and Show
buttons. Save the CAP file and open it in a diagnosis program, e.g. Wireshark. Check to
see whether a TCP connection at port 1723 and a data exchange with the GRE pro-
tocol are displayed.
Note
Some mobile telephone service providers block VPN connections via PPTP. Further-
more, there are older DSL routers which cannot correctly divert the GRE protocol to
the communications system. Resort to another VPN connection technology (L2TP,
IPSec or OpenVPN) or replace the DSL modem with a current model.
Tip:
If you wish to use the VPN function for a large number of smart-
phones, you should use the company administration functions
which are usually already integrated into the smartphone operat-
ing system.