Cisco 521SG - Unified IP Phone VoIP Administration Manual page 108

Configuring SIP, SPCP, and NAT
Configuring SIP
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
Parameter Description
SIP Timer H RFC-3261 INVITE final response time-out value for ACK
receipt. Ranges from 0 to 64 seconds. Defaults to 16
seconds.
SIP Timer D RFC-3261 wait time for response retransmits. Ranges from
0 to 64 seconds. Defaults to 16 seconds.
SIP Timer J RFC-3261 Wait time for Non-INVITE request retransmits.
Ranges from 0 to 64 seconds. Defaults to 16 seconds.
INVITE Expires The length of time the INVITE is valid. If you enter 0, the
Expires header is not included in the request. Ranges from
0 to 19999999999999999999999999999999. Defaults to
240 seconds.
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 smallest of the two values is used. Defaults to 1 second.
Reg Max Expires Maximum registration expiration time allowed from the
proxy in the Min-Expires header. If the value is greater than
this setting, the largest of the two values is used. Defaults to
7200 seconds.
Reg Retry Intvl 1 Interval to wait before the Cisco IP phone retries
registration after failing during the previous registration. The
range is from 1 to 268435455. Do not enter 0. Defaults to 30
seconds.
Reg Retry Long When registration fails with a SIP response code that does
Intvl1 not match the Retry Reg response status code (RSC) value
(see next table), the IP phone waits for this length of time
before retrying.
If this interval is 0, the Cisco IP phone stops trying. This
value should be much larger than the Reg Retry Intvl value.
The range is from 0 to 268435455. Defaults to 1200
seconds.
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