[Serusers] Date header in a REGISTER response

Hi, We are in the process of doing extensive testing with the new SIPURA SPA2000 unit on our network. (SER 0.8.11) One question has come up regarding the time on the unit itself. It does not support NTP but the developers say that if we can insert a Date header in a REGISTER response then the unit can pick up the time from that. This is an exact quote from them: " We thought that it would be simpler to deploy if the proxy server (or Gateway, or other entity) can insert a Date header (with GMT time).. . . Is it easy for you to insert a Date header in a REGISTER response, for instance? " Seems like a practical idea but I am unsure exacly how to go about doing this. Any suggestions? Thanks, Andres.