Cisco SPA 525G2 Administration Manual page 108

Configuring SIP, SPCP, and NAT
Configuring SIP
NOTE
Cisco Small Business SPA 300 Series, SPA 500 Series, and WIP310 IP Phone Administration Guide
Parameter
Reg Retry Random
Delay
Reg Retry Long
Random Delay
Reg Retry Intvl Cap
Sub Min Expires
Sub Max Expires
Sub Retry Intvl
Cisco IP phones can use a RETRY-AFTER value when 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 retrying 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 parameter.
Description
Random delay added to the Register Retry Intvl value when
retrying REGISTER after a failure. Minimum and maximum random
delay to be added to the short timer.
Defaults to 0, which disables this feature.
Random delay add ed to Register Retry Long Intvl value when
retrying REGISTER after a failure.
Minimum and maximum random delay to be added to the long
timer. Random delay range (in seconds) to add to the Register
Retry Long Intvl when retrying REGISTER after a failure.
Defaults to 0, which disables this feature.
NOTE Not applicable to WIP310.
Reg_Retry_Intvl_Cap—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 feature (that
is, the error retry interval is always at the Register Retry Intvl). If
this feature is enabled, the Reg Retry Random Delay is added on
top of the exponential backoff delay value.
NOTE Not applicable to WIP310.
The lower limit of the REGISTER (subscribe) expires value
returned from the proxy server.
Defaults to 10 seconds.
The upper limit of the REGISTER (subscribe) min-expires value
returned from the proxy server in the Min-Expires header.
Defaults to 7200 seconds.
The retry interval when the last Subscribe request fails.
Defaults to 10 seconds.
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