Hello, First post, I searched the 3CX, pfSense and VMware forum, but didn't find my answer yet. I also made a post on the pfSense forum: https://forum.pfsense.org/index.php?topic=124720.0 Problem is: auto provisioning is not working. It is my first ESXi install, and my first 3CX install. ESXi installed fine, created a Debian 8 VM, and installed 3CX. Connected this 3CX virtual server to my home network (Edgerouter Lite, and Toughswitches), connected a Yealink T41P phone to a ToughSwitch (PoE), and logged in to the web interface of 3CX. The phone showed up without any problems (using PnP, multicast), everything looked good! I played a little around with settings, and made an internal call on my desktop between 2 phones (T41P). Then it was time to install pfSense (this is the firewall application we have in our office, and I am also planning on installing it at home as VM. Worked many years with pfSense, and have a pretty good understanding of the software). I created a pfSense VM, setup 2 LAN networks (1x LAN, 1x LAN-VOIP (for testing)), and changed the switch and portgroup on the ESXi web interface (little bit trial and error, but I managed to get a VLAN for VOIP, with in this VLAN the 3CX server, and 2 phone's) With a little help from google, I managed to change all the settings on the 3CX server (change from VLAN also made a change in IP address). But I couldn't get the phone's to auto provision. I made a new Debian 8 VM, and installed 3CX fresh on the new VLAN (to be sure it didn't had any old IP's somewhere in the settings) But again, no auto provisioning. I tried every possible setting in the ESXI, and on the pfSense, but it didn't help. Then I again made a new Debian VM, and installed 3CX, this time connected to the home network again. Just to be sure it still worked (and I didn't make any faults configuring the switch/portgroup). And it worked! Now I only need to know why it is not working with my pfSense VM. Do I need to change some settings? Are the multicast packets blocked on the vSwitch? Does pfSense have anything to do with it? Does someone over here have any experience with this problem? Can you help me solve it? If you need more info, let me know!