Cisco SPA525G Administration Guide - Page 210

SPA and Wireless IP Phone Field Reference SIP Tab B NOTE: Cisco IP phones can use a RETRYAFTER 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 Parameter SIT1 RSC SIT2 RSC SIT3 RSC SIT4 RSC Try Backup RSC Cisco SPA and Wireless IP Phone Administration Guide Description 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. SIP response status code to INVITE on which to play the SIT2 Tone. Defaults to blank. SIP response status code to INVITE on which to play the SIT3 Tone. Defaults to blank. SIP response status code to INVITE on which to play the SIT4 Tone. Defaults to blank. SIP response code that retries a backup server for the current request. Defaults to blank. 208