On Thursday 19 June 2014 10:42:49 Keith wrote:

Thanks Daniel, however don't I need to send a register to get the 401 back? If so how do I do this bit?

Your message sounded like need to authenticate outbound calls, registrations will direct inbound calls to your machine. Never tried it, but for registrations you also need the uac module, see http://www.kamailio.org/docs/modules/stable/modules/uac.html#idp1670528