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Chapter 6: Using the Web-based Utility
The Voice Tab
IP Telephony System
occurrences of “ or \ in the string will be escaped with \” and \\ inside the pair of double quotes. Otherwise,
select no. The default is no.
SIP Timer Values (sec)
SIP T1. This is the RFC 3261 T1 value (RTT estimate), which can range from 0 to 64 seconds. The default is .5.
SIP T2. This is the RFC 3261 T2 value (maximum retransmit interval for non-INVITE requests and INVITE
responses), which can range from 0 to 64 seconds. The default is 4.
SIP T4. This is the RFC 3261 T4 value (maximum duration a message will remain in the network), which can
range from 0 to 64 seconds. The default is 5.
SIP Timer B. This is the INVITE time-out value, which can range from 0 to 64 seconds. The default is 32.
SIP Timer F. This is the non-INVITE time-out value, which can range from 0 to 64 seconds. The default is 32.
SIP Timer H. This is the INVITE final response, time-out value, which can range from 0 to 64 seconds. The default
is 32.
SIP Timer D. This is the ACK hang-around time, which can range from 0 to 64 seconds. The default is 32.
SIP Timer J. This is the non-INVITE response, hang-around time, which can range from 0 to 64 seconds. The
default is 32.
INVITE Expires. This is the INVITE request Expires header value. If you enter 0, then the Expires header is not
included in the request. The default is 240.
ReINVITE Expires. This is the ReINVITE request Expires header value. If you enter 0, then the Expires header is
not included in the request. The default is 30.
Reg Min Expires. This is the 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, then the minimum value is
used. The default is 1.
Reg Max Expires. This is the maximum registration expiration time allowed from the proxy in the Min-Expires
header. If the value is larger than this setting, then the maximum value is used. The default is 7200.
Reg Retry Intvl. This is the interval to wait before the System retries registration after failing during the last
registration. The default is 30.
Figure 6-15: Voice - SIP Screen - SIP Timer Values
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