[url]http://www.netcraftsmen.net/resources/blogs/sip-endpoints-in-cisco-communications-manager-call-manager-express-x-lite.html[/url]. Note that I donât have a UC520 system to test with but I believe the procedure will be the same as on a CUCME device. Hopefully you will find the above helpful.Thanks for the idea.url]http://www.netcraftsmen.net/resources/blogs/sip-endpoints-in-cisco-communications-manager-call-manager-express-x-lite.html[/url]. Note that I donât have a UC520 system to test with but I believe the procedure will be the same as on a CUCME device. Hopefully you will find the above helpful.