I just plugged an older SountPoint 320 into my new network where I have a new provisioning server and DHCP option set for autoconfiguration. It upgraded to the latest boot rom, but now is in a reboot loop saying "Error, application is not present!"
Logs on the HTTP-based provisioning server show that it downloads the boot rom and a config file (and that, combined with having auto-upgraded to the latest boot rom suggests that it is successfully getting the DHCP option), but doesn't attempt to load the SIP application.
10.10.155.212 - - [21/Oct/2016:15:57:28 -0700] "GET /provision/2345-12200-002.bootrom.ld HTTP/1.1" 200 107215 "-" "FileTransport PolycomSoundPointIP-SPIP_320-UA/4.3.1.0440"
10.10.155.212 - - [21/Oct/2016:15:57:28 -0700] "GET /provision/0004f21da7ab.cfg HTTP/1.1" 200 24 "-" "FileTransport PolycomSoundPointIP-SPIP_320-UA/4.3.1.0440"
10.10.155.212 - - [21/Oct/2016:15:57:28 -0700] "PUT /provision/0004f21da7ab-boot.log HTTP/1.1" 405 172 "-" "FileTransport PolycomSoundPointIP-SPIP_320-UA/4.3.1.0440"
A bunch of 650s on the same network have no problem.