Changing the hostname can cause the router to assign a new IP address. If you have port forwarding set up for the old IP address, incoming SIP requests would now be lost. Making an outgoing call could convince the router to forward those ports to the new IP temporarily.

On Sun, Apr 3, 2011 at 9:54 AM, Philippe Le Toquin <philippe@ppmt.org> wrote:

Last Friday I decided to rename the hostname of the guruplug and since then I have problem with
incoming calls no longer going through.