Linksys WIP310 SPA500 Series and WIP310 IP Phone Administration Guide - Page 227

Cisco SPA 500 Series and Wireless IP Phone Field Reference SIP Tab B Parameter Reg Max Expires Reg Retry Intvl (See note below) Reg Retry Long Intvl (See note below) Reg Retry Random Delay Reg Retry Long Random Delay Reg Retry Intvl Cap Sub Min Expires Sub Max Expires Description Maximum registration expiration time allowed from the proxy in the Min-Expires header. If the value is larger than this setting, the maximum value is used. Defaults to 7200. Interval to wait before the IP phone retries registration after failing during the last registration. Defaults to 30. When registration fails with a SIP response code that does not match, the IP phone waits for the specified length of time before retrying. If this interval is 0, the IP phone stops trying. This value should be much larger than the Reg Retry Intvl value, which should not be 0. Defaults to 1200. Random delay range (in seconds) to add to when retrying REGISTER after a failure. This feature was added in Release 5.1. Defaults to blank, which disables this feature. Random delay range (in seconds) to add to when retrying REGSITER after a failure. This feature was added in Release 5.1. Defaults to blank, which disables this feature. The maximum value to cap the exponential back-off retry delay (which starts at and doubles on every REGISTER retry after a failure). In other words, the retry interval is always at seconds after a failure. If this feature is enabled, 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 backoff feature. This value sets the lower limit of the REGISTER expires value returned from the Proxy server. This value sets the upper limit of the REGISTER minexpires value returned from the Proxy server in the Min-Expires header. Defaults to 7200. Cisco SPA 500 Series and WIP310 IP Phone Administration Guide 216