Here you go:

Connection Tab.
Transport = Auto
Outgoing Proxy = sip:sipgate.co.uk
Port= 5060
Discover Public Address = Ticked
Keep-Alive Mechanism= Auto
Keep-Alive Freq = 5

Authentication Tab.
Authentication user name = #######@sipgate.co.uk (last 7 numbers of my sipgate telephone number).
Password = my user password

STUN Tab.
Auto-detect STUN = Ticked
STUN Server = stun:sipgate.net:10000 (but greyed out as Auto-detect STUN ticked).
Stun Port = 3478 (but greyed out as Auto-detect STUN ticked).

Hope this helps :-)