Linksys WIP310 SPA500 Series and WIP310 IP Phone Administration Guide - Page 112

Configuring SIP, SPCP, and NAT Configuring SIP 4 Parameter Register Make Call Without Reg Register Expires Ans Call Without Reg Use DNS SRV DNS SRV Auto Prefix Proxy Fallback Intvl Description Enables periodic registration with the proxy. This parameter is ignored if a proxy is not specified. Defaults to yes. Enables making outbound calls without successful (dynamic) registration by the phone. If set to no, the dial tone plays only when registration is successful. Defaults to no. Defines how often the phone renews registration with the proxy. If the proxy responds to a REGISTER with a lower expires value, the phone renews registration based on that lower value instead of the configured value. If registration fails with an "Expires too brief" error response, the phone retries with the value specified in the Min-Expires header of the error. Defaults to 60 seconds. If enabled, the user does not have to be registered with the proxy to answer calls. Defaults to no. Enables DNS SRV lookup for the proxy and outbound proxy. Defaults to no. Enables the phone to automatically prepend the proxy or outbound proxy name with _sip._udp when performing a DNS SRV lookup on that name. Defaults to no. Sets the delay after which the phone retries from the highest priority proxy (or outbound proxy) after it has failed over to a lower priority server. The phone should have the primary and backup proxy server list via DNS SRV record lookup on the server name. It needs to know proxy priority; otherwise, it does not retry. Defaults to 3600 seconds. Cisco SPA 500 Series and WIP310 IP Phone Administration Guide 101