For Aastra 6757i, under Global SIP I need to enter
PhoneNumber
AuthenticationName
Password
ProxyServer
OutboundProxyServer
RegistrarServer
An example of x1001 with a password of 123456 and FreePBX server at 192.168.50.18 would be
PhoneNumber 1001
AuthenticationName 1001
Password 123456
ProxyServer 192.168.50.18
OutboundProxyServer 192.168.50.18
RegistrarServer 192.168.50.18
