Linksys WIP310 SPA500 Series and WIP310 IP Phone Administration Guide - Page 278

Cisco SPA 500 Series and Wireless IP Phone Field Reference Ext Tab B Parameter SIP 100REL Enable EXT SIP Port Auth Resync-Reboot SIP Proxy-Require SIP Remote-Party-ID Referor Bye Delay Refer-To Target Contact Referee Bye Delay Description To enable the support of 100REL SIP extension for reliable transmission of provisional responses (18x) and use of PRACK requests, select yes. Otherwise, select no. Defaults to no. The external SIP port number. If this feature is enabled, the IP phone authenticates the sender when it receives the NOTIFY resync reboot (RFC 2617) message. To use this feature, select yes. Otherwise, select no. Defaults to yes. The SIP proxy can support a specific extension or behavior when it sees this header from the user agent. If this field is configured and the proxy does not support it, it responds with the message, unsupported. Enter the appropriate header in the field provided. To use the Remote-Party-ID header instead of the From header, select yes. Otherwise, select no. Defaults to yes. Controls when the IP phone sends BYE to terminate stale call legs upon completion of call transfers. Multiple delay settings (Referor, Refer Target, Referee, and Refer-To Target) are configured on this screen. For the Referor Bye Delay, enter the appropriate period of time in seconds. Defaults to 4. To contact the refer-to target, select yes. Otherwise, select no. Default: no For the Referee Bye Delay, enter the appropriate period of time in seconds. Defaults to 0. Cisco SPA 500 Series and WIP310 IP Phone Administration Guide 267