By calling the gsm unit you have established a call and it thinks it has recieved an incoming call. I have only ever seen these things working off analogue line ports not extension ports.
When you say no signal do you mean GSM?
Thanks for the feed back. You will probably have guest that the networking/IT side of things is all new to me. I may go down the route of setting up a stand alone vpn connection just for voip this may appease my IT department and means that I will not be so beholden to them! hooray!
Does that...
Guy's & Gal's
As you well know when using IP hard or soft phones you have to open a whole plethora of ports on the firewall. Can any one tell me what risks are involved in doing this?
I have an IT guy who is very twitchy about opening the ports and so i just wanted to understand the risks...
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