Polycom SpectraLink 1725-36034-001 - Manual (Page 43)

Software License and Protocol Management
PN: 1725-36034-001_B.doc 43
6. During the second download evolution, the handset receives code
from the TFTP server for system configuration and for its own
settings. Once this second evolution is complete, the handset is
ready to use.
For future software upgrades, simply update the files that are stored
on the TFTP server. Each time the handset is powered up, it will
check with the TFTP server to ensure it has the proper software
version.