Hi willkemp,
Tanx for your reply. I need to change the hardphone to 81 port because in one country they blocked the 5060 and 5062 ports, so our service is not able to work in whole country.
I made the plann to change the whole port with 81 becuase normaly the 81 and 80 ports are always opened from any ISP.
If there is anyway to change whole Asterisk port 5060 with 81 so our clients can connect easly using 81 port.