SIP IP adress are united for most companies as i know , and this ip is blocked in my country , so i want to return back to the old H232 phones ,otherwise if got any way to tech me how to switch my DUV 1000 IP phones to any other working system i will be very thankful to you .
all you have to do is get a gateway or SIP/H323 phone that you can change the control ports on. They have them out there.. the one I bought does that. email me for more information. this does not have to cost you much money, and certainly no more than just buying a standard gateway.