[jitsi-users] incoming phone calls not signalled

this is my first contact.
My environment is Windows 7 and Outlook 2013.

For quite some time I tried to make Jitsi work with my MS Outlook, and I can
now make a phone call through my SIP provider by pressing on the number in
my outlook contacts.

But there is no ring when this phone number is called.
Let me add that during my first tries I got ringing on my notebook, possibly
outside outlook, but not any more recently.

I tried to find some guidance on troubleshooting, but did not find anything
to help me with this.