Hi tazz,
First, you must have a VOIP-IN number: cost € 1.00 and it is easy:
Here is VOIPCHEAP parameters:
SIP port : 5060
Registrar : sip.voipcheap.co.uk
Proxy server : sip.voipcheap.co.uk
Outbound proxy server : leave empty
Account name : your VoipCheap username
Password : your VoipCheap password
Display name/number : your VoipCheap username or voipnumber
Stunserver (option) : stun.voipcheap.co.uk
From left panel: ADD VOIP
Give a name: e.g VOIPCHEAPUK
select Generic then NEXT
complete page with
Registrar/Proxy Hostname or IP => sip.voipcheap.co.uk
Registrar/Proxy Port => 5060
Outbound Proxy Hostname or IP => Empty
Outbound Proxy Port (default is 5060)
STUN server Hostname or IP => stun.voipcheap.co.uk But optional
STUN server Port (default is 3478) => 3478
do not change anything else THEN NEXT
External Number => use the same format VOIPCHEAP has gave you
Authentication ID => your VoipCheap username
Authentication Password => your VoipCheap password
setup your route inbond calls then next
finish or setup a prefix for your line.