[Freeswitch-users] Inbound calls question

[regs at kinetix.gr]

Hi,

    How can my FS accept inbound SIP calls from other gateways
without the need of a registration from their part? I only need to be able
to accept inbound calls from specific gateway IPs. I tried creating my 
own profile
and gateway but it fails : "Error Creating SIP UA for profile: myprofile"

Can someone give me some first-step directions?