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5-11
Linksys IP Phone Administrator Guide
Firmware Version 5.1
Chapter 5 Linksys IP Phone Field Reference
SIP Tab
SIP Timer Values (sec)
Note None of the following parameters apply to the SPA901.
Field Description
SIP T1 RFC 3261 T1 value (RTT estimate), which can range from 0 to 64 seconds. Defaults to .5
seconds.
SIP T2 RFC 3261 T2 value (maximum retransmit interval for non-INVITE requests and INVITE
responses), which can range from 0 to 64 seconds. Defaults to 4 seconds.
SIP T4 RFC 3261 T4 value (maximum duration a message remains in the network), which can
range from 0 to 64 seconds. Defaults to 5 seconds.
SIP Timer B INVITE time-out value, which can range from 0 to 64 seconds. Defaults to 16 seconds.
SIP Timer F Non-INVITE time-out value, which can range from 0 to 64 seconds.Defaults to 16
seconds.
SIP Timer H INVITE final response, time-out value, which can range from 0 to 64 seconds.Defaults to
16 seconds.
SIP Timer D ACK hang-around time, which can range from 0 to 64 seconds. Defaults to 16 seconds.
SIP Timer J Non-INVITE response hang-around time, which can range from 0 to 64 seconds. Defaults
to 16 seconds.
INVITE Expires INVITE request Expires header value. If you enter 0, the Expires header is not included
in the request. Ranges from 0 to 19999999999999999999999999999999. Defaults to 240.
ReINVITE Expires ReINVITE request Expires header value. If you enter 0, the Expires header is not included
in the request. Ranges from 0 to 19999999999999999999999999999999. Defaults to 30.
Reg Min Expires Minimum registration expiration time allowed from the proxy in the Expires header or as
a Contact header parameter. If the proxy returns a value less than this setting, the
minimum value is used.
Defaults to 1.
Reg Max Expires Maximum registration expiration time allowed from the proxy in the Min-Expires header.
If the value is larger than this setting, the maximum value is used.
Defaults to 7200.
Reg Retry Intvl Interval to wait before the Linksys IP phone retries registration after failing during the last
registration.
Defaults to 30.
Reg Retry Long Intvl When registration fails with a SIP response code that does not match<Retry Reg RSC>,
the Linksys IP phone waits for the specified length of time before retrying. If this interval
is 0, the Linksys IP phone stops trying. This value should be much larger than the Reg
Retry Intvl value, which should not be 0.
Defaults to 1200.