Response Status Code Handling - Cisco 8851 Administration Manual

Parameter
Reg Retry Intvl Cap
Sub Min Expires
Sub Max Expires
Sub Retry Intvl
The phone can use a RETRY-AFTER value when it is received from a SIP proxy server that is too busy
Note
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.

Response Status Code Handling

Parameter
Try Backup RSC
Description
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.
Description
This parameter may be set to invoke failover upon receiving specified
response codes.
Default: Blank
For example, you can enter numeric values 500 or a combination of
numeric values plus wild cards if multiple values are possible. For the
later, you can use 5?? to represent all SIP Response messages within
the 500 range. If you want to use multiple ranges, you can add a comma
"," to delimit values of 5?? and 6??
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
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