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Only the latest firmware 1.0.3.37 supports DHCP VLAN discovery.
The latest firmware 1.0.3.37 does not seem to be compatible with the current commercial FreePBX EPM. Phones auto reboot after requesting cfg.xml
from the TFTP server.
Grandstream phones auto-reboot endlessly if they don't like the configuration files.
Try performing a factory reset if you experience provisioning problems.
Perform a factory reset after any firmware update.
This is a 'normal' phone reboot:
[root@ppmpbx ~]# tail -f /var/log/messages Aug 23 13:51:38 ppmpbx in.tftpd[21710]: RRQ from 192.168.71.68 filename cfg.xml Aug 23 13:52:23 ppmpbx dhcpd: DHCPDISCOVER from 00:0b:82:70:f7:41 via eth0 Aug 23 13:52:24 ppmpbx dhcpd: DHCPOFFER on 192.168.71.68 to 00:0b:82:70:f7:41 via eth0 Aug 23 13:52:24 ppmpbx dhcpd: DHCPREQUEST for 192.168.71.68 (192.168.71.30) from 00:0b:82:70:f7:41 via eth0 Aug 23 13:52:24 ppmpbx dhcpd: DHCPACK on 192.168.71.68 to 00:0b:82:70:f7:41 via eth0 Aug 23 13:52:40 ppmpbx in.tftpd[21759]: RRQ from 192.168.71.68 filename /grandstream/1/gxv3275_rescue.bin Aug 23 13:52:52 ppmpbx in.tftpd[21763]: RRQ from 192.168.71.68 filename cfg000b8270f741 Aug 23 13:52:52 ppmpbx in.tftpd[21764]: RRQ from 192.168.71.68 filename cfg000b8270f741.xml Aug 23 13:52:52 ppmpbx in.tftpd[21765]: RRQ from 192.168.71.68 filename cfg.xml Aug 23 13:52:54 ppmpbx in.tftpd[21766]: RRQ from 192.168.71.68 filename /grandstream/1/gxv3275fw.bin