Polycom SpectraLink 8020 Administration Manual page 15

SpectraLink Wireless Telephone Overview
TFTP server
Required in the system to distribute software to the handsets. May be
on a different subnet than the gateway, APs and/or handsets.
SIP TFTP server
Required in the system to deliver SIP configuration parameters to the
SIP handset whenever a SIP handset is powered-up. The location of
the SIP TFTP server is separately specified in SIP handset
administration parameters (See Chapter 2 SpectraLink 8020/8030
Wireless Telephone Configuration, section The Admin Menu.) Normally,
the SIP TFTP server is the same as the network TFTP server, see
above.
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