Polycom SpectraLink 1725-36038-001 Administration Manual page 36

SpectraLink 8020/8030 Wireless Telephone: Administration Guide for SIP
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seconds, if the server's response interval doesn't take
precedence.
If the server has a lower maximum setting or a higher
minimum setting that this value then the server's response will
take precedence and this parameter will be ignored.
The phone will always attempt to re-register with the PROXY
20 seconds prior to the expiration interval. Thus, if this
parameter is set to 35 seconds, and the server's response
interval doesn't take precedence, then the phone will attempt
to re-register every 15 seconds. E.g.
PROXY1_REREG_SECS=3600
g PROXYn_KEEPALIVE_SECS: specifies that the handset
should send keepalives to the PROXYn server. It can be set
to 0 or anywhere from 10 to 3600 seconds. The default value
(which is applied if no parameter is supplied in this file) is 0
which means the handset will not send keepalives to
PROXYn.
If the handset fails to get a keepalive response within the SIP
32 second timeout, the keepalives are terminated for that
PROXY until the next successful registration to the PROXY.
This parameter is REQUIRED when the handsets are
operating in WI-FI standard QoS mode. This is because Linux,
the OS running Asterisk, has a ARP Cache flushing
mechanism. For 8020 and 8030 handsets operating in SVP
mode, ARP Cache is refreshed by the SVP server. If the
handsets are operating in standard based QoS method ARP
cache refresh has to be done by handset.
The value of this parameter for handsets should be just less
than the minimum ARP Cache flushing time on the Linux box
running Asterisk. For Redhat this minimum flushing time is
15 seconds, so the parameter needs to be set for 14 seconds or
less. For other Linux Distributions, you may have to determine
what this minimum value is, however 14 seconds should work
fine. E.g.:
PROXY1_KEEPALIVE_SECS=14
The lower this setting, the more the impact on the handset's
standby battery life.
8020/8030 handsets running version 131.017 and earlier code
ignore this parameter if present).
h PROXYn_DOMAIN = axlx.engr.local
Replace this with your SIP Domain's name. E.g.
PROXY1_DOMAIN = plcmengr.com
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