Polycom SpectraLink 8030 - Manual (Page 34)

SpectraLink 8020/8030 Wireless Telephone: Administration Guide for SIP
34 PN: 1725-36038-001_E.doc
SpectraLink 8020/8030 Wireless Telephones cannot roam with
uninterrupted service between subnets unless specific LAN
components are present. Certain AP/Ethernet switch combinations
establish a Layer-2 tunnel across subnets that enable the handsets
to roam. Without this capability, any call in progress will be dropped
when the user moves out of range and the handset must be power
cycled in order to resume functionality in the new subnet area.
Ensure that all your APs are attached to the same subnet for proper
operation. The handset can change subnets if DHCP is enabled and
the handset is powered off then back on when within range of APs
on the new subnet. Note that the wireless telephones cannot “roam”
across subnets, since they cannot change IP addresses while
operational.
Please see Best Practices for Deploying Enterprise-Grade Wi-Fi
Telephony
for detailed configuration information.
TFTP Server IP The IP address of a TFTP server on your network,
which holds software images for updating the handsets and
contains the handset files. If this feature is configured (not set to
0.0.0.0 or 255.255.255.255) with either Static IP configuration or
using DHCP option 66 (TFTP server), or the boot server/next
server (siaddr) field, the handset will check for newer software
each time it is powered on or comes back into range of your
network. This check takes only a second and ensures that all
handsets in your network are kept up-to-date with the same
version of software.
Syslog Server IP The IP address of the syslog server. See the
Diagnostic Tools section for more information.
Time Server IP The IP address of the time server.
SVP Server IP The IP address of the SpectraLink 8000 SVP Server. If
using Static IP configuration, this is simply the IP address of the
SpectraLink 8000 SVP Server. Note that the SpectraLink 8000 SVP
Server must be statically configured to have a permanent IP
address. If DHCP is being used, the handset will try the following,
in order: the DHCP option 151, then a DNS lookup of
“SLNKSVP2” if the DHCP options 6 (DNS server) and 15 (Domain
Name) are configured.
SIP TFTP Server IP The IP address of a TFTP server on your network,
which holds SIP configuration files. In static mode, this parameter
must be configured with an IP address. In DHCP mode, the SIP
TFTP server may be specified by defining the address on the DNS