User's Manual

The following figure demonstrates how critical it is that the server can communicate directly
with the IP Deskphone through the use of the established TCP connection because it has no
way of getting through the firewall in order to contact port 5060 on the IP Deskphone.
Figure 38: Connection reuse and a firewall
Table 34: 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: 5
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
Security
236 SIP Software for Avaya 1100 Series IP Deskphones-Administration November 2012
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