
Figure 50: Connection reuse and a firewall
Table 84: Connection timers definitions and allowed values
Parameter
name
Description Default
value
Boundaries
OS Keep-
alive only
Selecting this value
causes the OS TCP
Keep-alive functions to be
used instead of the CRLF
ping/pong mechanism.
Some system
deployments may prefer
the lighter weight TCP
keep-alive
Not
checked
Checked
Keep-alive This is a value, measured
in seconds, that the IP
Deskphone uses when a
connection to the server is
established using TCP or
TLS. The IP Deskphone
periodically sends a
packet to the server,
which contains a pair of
CRLF, to ensure the
server is responding.
30 Min: 15 Max: 1800
Register
Retry
When a connection failure
occurs, this value in
seconds is how long the
IP Deskphone waits
before attempting to
reregister with the proxy.
30 Min: 30 Max: 1800
Register
Max Retry
After a failure to reconnect
with the proxy, the IP
Deskphone increases the
amount of time that it
1800 Min: 600 Max: 1800
TCP/TLS operation overview
SIP Software for Avaya 1200 Series IP Deskphones-Administration January 2012 251
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