[tomblandford]

King,

I have setup ENUM lookup in my dial plan for 08Z numbers but not for 080 numbers. That stops ENUM working on 0800 numbers which are free anyway. I also set up 908Z numbers to not use ENUM so that if ENUM doesn't work, I just dial 9 first to route without ENUM. It works well.

10 _08Z. ${EXTEN} Voip.co.uk with ENUM
11 _908Z. ${EXTEN:1} Voip.co.uk without ENUM
15 _0[58]0. ${EXTEN} Voip.co.uk without ENUM

BTW, Sipgate don't require 0044 so you can just have ${EXTEN} for your 08 numbers. If you skip the 0044 though you'll need to do what Martin said and put 44${EXTEN} for ENUM lookup field.