Having a bit of trouble with this, hoping someone can help. I've followed the instructions in the blog post (http://www.3cx.com/blog/voip-howto/direct-sip/), and the calls seem to be arriving at my 3CX install, but with the following error: Code: 10-Jul-2014 20:46:58.859 [CM500002]: Unidentified incoming call. Review INVITE and adjust source identification: Invite-UNK Recv Req INVITE from 126.96.36.199:47223 tid=c5f09852d1b0bccd8c099d01bc52bf63 Call-IDemail@example.com: INVITE sip:firstname.lastname@example.org SIP/2.0 Domain.co.uk is the same as the one entered as the local SIP domain in Settings > Advanced. 'enquiries' exists as the SIP ID on an extension. I'm a bit stumped as all the source identification seems to be set on providers, which aren't a thing that exists when using direct SIP. Any ideas?