Cisco Ip Phone 6800 Series Multiplatform Phones Administration Guide - Cisco IP Phone 6851 Administration Manual

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Parameter
Reg Retry Long Intvl
Reg Retry Random Delay
Reg Retry Long Random Delay
Reg Retry Intvl Cap
Sub Min Expires
Sub Max Expires
Sub Retry Intvl
Note The phone can use a RETRY-AFTER value when it is received from a SIP proxy server that is too busy
to process a request (503 Service Unavailable message). If the response message includes a RETRY-AFTER
header, the phone waits for the specified length of time before to REGISTER again. If a RETRY-AFTER
header is not present, the phone waits for the value specified in the Reg Retry Interval or the Reg Retry
Long Interval.

Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide

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Description
When registration fails with a SIP response code that does not
match<Retry Reg RSC>, the Cisco IP Phone waits for the specified
length of time before retrying. If this interval is 0, the phone stops trying.
This value should be much larger than the Reg Retry Intvl value, which
should not be 0.
Default: 1200
See the note below for additional details.
Random delay range (in seconds) to add to <Register Retry Intvl> when
retrying REGISTER after a failure. Minimum and maximum random
delay to be added to the short timer. The range is from 0 to 2147483647.
Default: 0
Random delay range (in seconds) to add to <Register Retry Long Intvl>
when retrying REGISTER after a failure.
Default: 0
Maximum value of the exponential delay. The maximum value to cap
the exponential backoff retry delay (which starts at the Register Retry
Intvl and doubles every retry). Defaults to 0, which disables the
exponential backoff (that is, the error retry interval is always at the
Register Retry Intvl). When this feature is enabled, the Reg Retry
Random Delay is added to the exponential backoff delay value. The
range is from 0 to 2147483647.
Default: 0
Sets the lower limit of the REGISTER expires value returned from the
Proxy server.
Sets the upper limit of the REGISTER minexpires value returned from
the Proxy server in the Min-Expires header.
Default: 7200.
This value (in seconds) determines the retry interval when the last
Subscribe request fails.
Default: 10.