Cisco 521SG Administration Guide - Page 109

Configuring SIP, SPCP, and NAT Configuring SIP 4 Parameter Reg Retry Random Delay Reg Retry Long Random Delay Reg Retry Intvl Cap Sub Min Expires Sub Max Expires Sub Retry Intvl 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. The range is from 0 to 268435455. Defaults to 0, which disables this feature. Random delay added 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. Not applicable to Cisco 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 (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 268435455. Not applicable to Cisco WIP310. Lower limit of the REGISTER (subscribe) expires value returned from the proxy server. The range is from 0 to 268435455. Defaults to 10 seconds. Upper limit of the REGISTER (subscribe) min-expires value returned from the proxy server in the Min-Expires header. The range is from 0 to 268435455. Defaults to 7200 seconds. The retry interval when the last Subscribe request fails. The range is from 0 to 268435455. Defaults to 10 seconds. 1. Cisco IP phones 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 Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 108