Cisco SPA IP Phone Field Reference
SIP Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 246
B
NOTE 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.
Response Status Code Handling
Reg Retry Intvl Cap The maximum value to cap the exponential back-off
retry delay (which starts at <Register Retry Intvl> and
doubles on every REGISTER retry after a failure). In
other words, the retry interval is always at <Register
Retry Intvl> seconds after a failure. If this feature is
enabled, <Reg Retry Random Delay> is added on top
of the exponential back-off adjusted delay value. This
feature was added in Release 5.1.
Defaults to blank, which disables the exponential back-
off feature.
Sub Min Expires This value sets the lower limit of the REGISTER expires
value returned from the Proxy server.
Sub Max Expires This value sets the upper limit of the REGISTER min-
expires value returned from the Proxy server in the
Min-Expires header. Defaults to 7200.
Sub Retry Intvl This value (in seconds) determines the retry interval
when the last Subscribe request fails. Defaults to 10.
Parameter Description
Parameter Description
SIT1 RSC SIP response status code for the appropriate Special
Information Tone (SIT). For example, if you set the SIT1
RSC to 404, when the user makes a call and a failure
code of 404 is returned, the SIT1 tone is played.
Reorder or Busy Tone is played by default for all
unsuccessful response status code for SIT 1 RSC
through SIT 4 RSC.
Defaults to blank.
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