No GSM Ring Tone When 3CX Tunnel (1.3.1) Is Up

[huihc]

Phone Model: Samsung Galaxy S II GT-I9100
Android Version: 2.3.3

----------
I installed 3CX Tunnel (1.3.1) on my Samsung Galaxy S II GT-I9100. I found that incoming GSM call has no ring tone when 3CX Tunnel (1.3.1) is up.
----------

Contacts: [email protected]
Connection: WiFi
Server: Internal

Thanks for any help.

HC