User's Manual

Firmware Version 1.0.0.32 UCM6102/6104/6108/6116 USER MANUAL Page 39 of 110
Figure 21: Provisioning Example 2
This is another typical setup. In this setup, the UCM6102/UCM6104/UCM6108/UCM6116 is placed directly
over the internet (outside from the network where the phones are deployed). Under this topology, the
UCM6102/UCM6104/UCM6108/UCM6116 cannot reach the phones on its own and the typical auto
discovery will not work.
In this case, the phones can still be provisioned. But the UCM6102/UCM6104/UCM6108/UCM6116 will
need help to get the phones to point itself to the UCM6102/UCM6104/UCM6108/UCM6116 first. One
possible solution could be as follows.
 Turn on DHCP Option 66 in the network where the phones are deployed and set the value as:
option tftp-server-name "http(s)://ucm_ip_address:port/zccgi".
 All Grandstream phones have DHCP Option 66 turned on by default.
 Once the phone is provisioned with the DHCP Option 66, it will be redirected to the
UCM6102/UCM6104/UCM6108/UCM6116 and send request for config file.
 When the phone requests cfgMAC.xml from the UCM6102/UCM6104/UCM6108/UCM6116, the
UCM6102/UCM6104/UCM6108/UCM6116 will add the phone to the provision list.